Panasonic TV does not turn on. TV does not turn on - tips for users and experience telemoles. Malfunctions of electronic elements

What if the TV Panasonic does not turn on?

Panasonic products are known for their reliability, durability and excellent assembly quality. Nevertheless, the problem, due to which the TV Panasonic does not turn on, can be caught in the owner of the equipment by surprise. This can say, as a non-existent malfunction of the device with which the user can cope with their own and serious breakage, to eliminate which the professional master will need service Center "To repair!".

This problem may occur due to voltage jumps in the power grid, software failure, power supply failure, the failure of the capacitor, the fees of the board, or the breakdown of other components of the device.

Why does Panasonic TV not turn on?

Depending on the cause of the breakdown, the TV may behave differently:

• the TV indicator flashes several times - a specific amount of flashing signals a certain malfunction (self-diagnosis);
• the indicator is on constantly - this reports that the power supply is received by the power supply, but the block protection does not allow the device to turn on;
• the indicator does not burn - it can talk about the malfunction of the power supply;
• the TV makes uncharacteric sounds: Clicks, Crack, etc.

The diagnosis that our wizards perform at the first stage will certainly show the real cause of incorrect behavior of the device. But before contacting our service center, we recommend the owners of the technicians to perform the following steps:

• disable the device and try to activate it from the button on the panel, and not from the remote;
• disable the device for 20-25 minutes;
• check the performance of the batteries in the remote control;
• disconnect foreign external appliances from the TV.

If you have completed these actions, but the Panasonic TV does not turn on, as before - boldly call our service and we will send the master, which in the shortest possible time will repair home repairs.

Professional repair of TVs Panasonic

Stripping from the results of diagnostics, the specialist is ready to repair or replace the following spare parts:

• power supply;
• inverter;
• microcircuits;
• condenser;
• other components.

Modern Televisions Panasonic have a rather complicated device, so repairing the repair is almost impossible. Company "To repair!" Always ready to help our customers. We provide services in Moscow and St. Petersburg.

Panasonic TV broke, and its warranty has already expired - a familiar situation. Carry the TV in the workshop or call the telemaster to the house and you declare that the repair will cost several thousand rubles - it is easier to buy a new one. Quite often you can hear from the masters that your technique is not subject to repair. Is it so? The question is ambiguous. Let's try to consider a specific situation and the main algorithm of actions.

And so, the TV is a modern LCD model or Panasonic plasma. Suppose the most radical option - the black screen does not turn on. What to do? First, do not call the telemaster to the house of newspaper ads - this is a "cat in a bag." A good master can get caught, and a former plumber can come. There is generally such a category of "wonderful masters", which come with a business type of a highly qualified specialist, long dripped off inside the case and then sadly declare that "Repair is not possible ...", take money for the challenge and diagnosis and go. Also, the call master can also fix a trifle malfunction, and give it to expensive repairs, harvested with you a round sum - Try later prove and find this craftscher.

In general, we will immediately agree that the identification of a malfunction in a broken TV and its diagnosis at home is extremely difficult. Therefore, do not lazy, take the tv armpit and go to a solid professional television workshop. We give there Panasonic TV to diagnose and identify a malfunction. This procedure is usually inexpensive and any of us by pocket. The Master will examine your TV with the help of modern diagnostic equipment and specialized software. For several tens of minutes you will know exactly what you broke in your TV.

Now we learn from the master how much repair will cost. If the repair is inexpensive, then we leave the TV in the workshop, especially since the warranty remains on the repair. If the repair is expensive and it correlates with the purchase of a new Panasonic TV, then we take the TV again an armpit, say Thank you for the diagnosis and go home. It must be borne in mind that the price of the TV in the workshop includes the rental fee, wage Masters and staff, tax deductions, payment of security and fire alarms and much more. The cost price of repair itself lays 10% of the total amount that you have to pay this service. therefore dIY repair You will be cheaper at times. Find out in advance, before going to the workshop, the purchase price of the new Panasonic TV is the same model. It is very easy to do this very simply by going to any advertisement on the Internet on specialized sites.

It is noteworthy that in contrast to other industrial and grocery products, appliances, including TVs, is cheaper every year, and their quality improves. So that the TV you bought two years ago, today will cost much cheaper. You can make sure that you look at the links on this site modern prices.

By purchasing a new Panasonic TV, do not rush to throw out the old broken unit. The second TV in the farm thing is not superfluous - it can be placed in the kitchen or in the bedroom and then do not quarrel with homely due to the selection of brograms. Almost any Panasonic TV can be reanimated and reinforced independently at home, besides, now when you know his malfunction after a hike in the workshop.

Consider the main faults that can be highlighted at home at the modern LCD, LED or LCD, Panasonic plasma TV

1.) Not included. Open R833 22 OM in BP - change part of the secondary power supply chains of Panasonic

2.) The fault is manifested as follows: A squeak is heard and the TV does not even turn on to the standby mode. All voltages from the power supply are underestimated. The reason is broken by protective stabilion D835 on a chain of 42 V. On native Stabilion, two colored rings are green and blue, which apparently denotes 56, so we put the stabilion on the 56th century and the repair finish.

3.). Very quiet sound with ether, from AV-input is normal. After replacing the multifunctional IC AN5192K-B, the normal operation of the TV is restored.

4.) The "AN5192K-B" chip is the reason for many problems of Panasonic machines in which it is installed. Example: - There is no color when viewing PAL-video programs, SECAM-in color. In three cases out of three, it is native! Do not forget to choose the color system to TV.

5.) The failure of the output transistor CP after unequal intervals (but quickly) CAP capacitors are good, the electrolytes of the master cascade also. The reason was covered in virtually invisible ring cracks of both outlets of the secondary winding of the transformer of the master cascade.

6.) No raster, understated U +90 V. R 816 is heated, I replaced the Q 802-A1512 everything became OK

7.) There is no launch, it breaks through Stabilitron Ma-56 according to the chain 47V. When measured was 100V. Open R826-22 Ohm.

8.) After the overvoltage and standard replacement of parts in the power supply in a day - two will burn out the stabilitron standing 30V going on the UH if it does not put in standby mode, it turns out 60-80V UH chips burns, if there is no stabilion From this U and plug on the 27V frame-running personnel, there will be no more ONCH.

9.) Washed image. Faulty 2.5V stabilizer (TL431) on the monitor board.

10.) Periodic deterioration of the image (the image becomes dim - the video signal is noticeably reduced). The sound remains normal. Reason: The emitter repeater on the Q117 transistor (planar) in the submodule MS-Board is faulty (MS-BOARD is still worth MS M52317SP on it). Replaced on KT315.

11.) There is no sound through the tuner, with AV input everything is fine. Faulty MK / CX AN5192K-B. After replacing all OK.

12.) Little horizontal picture. The output line transistor is heated as a stove. The defect is caused by the leakage of the mica gasket under the output line transistor and the aging of the plastic fastener (piston) through which the filling screw passes (for mounting the output transistor to the radiator). This defect is found in all models collected on this chassis.13.) Panasonic assembled on the MX7 chassis An interesting defect: the power supply is preserved. On the secondary circuits of the lower case sweep instead of 30 in from 80 to 130V, in operation, everything is in order -140V, TV can work without any problems. The "Cold" end of the Opopara LED is pressed against the Earth through the current generator on the D862 R859 Q854 key Q853, the test of this chain did not reveal anything, but hindering this chain with a resistor of 8.2 kΩ from the "cold" end of the clock to the ground received the required 30 volt of the duty regime That on the small currents "Durkut" the optopara replaced her, everything became OK!

14.) After the inclusion of 10-30 minutes starts twist horizontally and TV turns off for a second, and everything is repeated. Cause - Fault STR51424 (bad cooling). Replace this str "KU, to increase the area of \u200b\u200bthe radiator and replace the clamping bracket on the STR" to the screw with a nut with a nut, drill a hole in the radiator. On TV changed 4 STR, 1st worked for a month, 2nd week, 3rd three months, 4th two years. No regularity. Or defective STR "KI or it is necessary to adopt the above measures that still not be checked.

15.) After switching on 10-30 minutes, the screen starts to twitch horizontally and cut down for a second, and everything is repeated. Cause - Fault STR51424 (bad cooling). Replace this str "KU, to increase the area of \u200b\u200bthe radiator and replace the clamping bracket on the STR" to the screw with a nut with a nut, drill a hole in the radiator. On the this TV I changed 4 STR, 1st worked for a month, 2nd week, 3rd months, 4th two years. No regularity. Or defective STR "KI or it is necessary to adopt the above measures that still not be checked.

16.) When you turn on the TV, it works steadily, after different intervals, stripes and twitch appear, the image disappears. May not work at all, black screen. Tip - throw away the switch on the mixer (in the box where the antenna is stuck) and put the jumper in the lower position. Next, take out both radio channel cards (stand next to the tuners) drop out the screen and replace the condenser 470mp-6.3v preferably for more voltage. The capacitor gives the leakage - as a result, two interlayer connections are rotated under it. Punch the hole, insert the wire loving and suck on both sides.


17.) Not included. Visual inspection of the power supply showed: burst - 2SA1512 (Q805), 2SC3940 (Q802). In addition, naturally, the key transistor C5253, and in its emitter circuit, the swollen R by 0.47 Ohm. Next, the check showed: the XA4068L stabilion break (according to the D806 scheme) by 6.8 volts as well as the cliffs of the R834-220 Ohm, R826-22 Ohm, R823-1.2 K. Instead of the key C5253 (1500V. and 18a!) It was successfully applied Cheapest BU508AF.

18.) Defect - Big "Sichka". Mall size horizontally, depends on the brightness and plot of the image. The web background - 100 Hz in the image is not marked !!! Elimination - Replace the power filter of the power supply unit of 270 μF to 400 V (loss of tank)

19.) Defect: does not go to the operating mode. Cries in duty and operating mode. Looks like overload in the load. If in the power bus + 123 in the add a 60 W light bulb, then the TV is turned on and operates normally, but in the standby mode it all the same cycles. The supply voltage of the lowercase sweep +123 V was not reset to +1 B, and remained +123 V. Elimination: Replace R812 - 33 Ohm 1 W - torn off.


20.) Defect: The TV does not turn on, died at night, being in the duty room. Elimination: Replace the wagon of the tire + 50B D835-MA2580 - breaks (this is a consequence). The true reason is the silence of C805 (47 μF 35V) in the power supply. 21.) 380V fell into the network (the second phase wire fell on the "zero"). Lights network fuse 4a. Cause: Two holes in the side wall of the condenser 330MCF / 400V. Replaced the container, and everything went.
22.) Repaired with faulty block Nutrition. Replaced faulty parts (2ss5249, 2ss3940, 2SA1512, FD312, RM25), checked all the details, turn on, running normally. But when switching the TV in the duty mode, everything burned out again. The reason turned out in two resistors of 220 ohms. Positions for sure I do not remember, and in the scheme it is unintelligible printed. One of them is connected between the base and emitter 2SA1512, and the other one output to the 2SS3940 database. When measuring can show 220 ohms, but they still need to be changed, otherwise everything will happen

Elements are not able to perfectly block the flow of light - black on the screen of the LCD TV is not really absolutely black.

Of the disadvantages, it is also necessary to note the distortion of colors and the contrast loss, since the viewing angle of the LCD is not so wide. Because of this feature, LCD TVs could not be gained popularity for a long time, but now, thanks to the efforts of developers, distortions have become practically invisible.

The advantages of television with a liquid crystal screen can be attributed a wide selection of models with different brightness indicators (from 250 to 1500 kD / m2) and contrast (from 500: 1 to 5,000,000: 1). Due to this, the buyer can purchase a device that is optimally combining the desired image quality and the affordable price. In addition, LCD televisions have low weight and thickness, so they can be placed on the wall.

But the biggest merit of liquid crystal technology is in its mass. Due to large-scale production, prices for TVs with LCD matrix are now lower than on other similar devices.

23.) The defects of the lowercase scan node why the lowercase transistor flies? - It is necessary to suck the specifying transf and in BP a bunch of cold swabs.

24.) The dige-mode indicator is not lit, the TV does not turn on, at the output of the power supply unit 58V. Open resistor R833 22, in the ON / ST.BY key. After replacing 140.8V / 34.5V.

25.) Smoke C812-1000.0 * 35V and C831-220.0 * 50V. Change C805 in BP 47.0 * 50V. Could fail D1101-5V1 and IC802-7805.
- Clear Raster on the right. Again and even replacement TMS did not help. The culprit was Q565-2SD1275A, replaced with C2271.
-Ekran Beleet - TV turns off in Stand-BY. Suck tdks.

26.) Volume is adjustable in small limits (0 - 5), the "FUNCTION" button does not work, the channels switches. Replacing the result processor did not give. After entering the service mode (press the "Recall" buttons on the PD and "VOL -" on the front panel TV), the defect disappeared.
Most likely the hotel mode was accidentally installed in the TV.

27.) When the TV is turned on, the image appears, but without one of the main colors (in my case there was no blue), and then the screen completely goes out. When checking the monitor mode, it turns out that the latter is tightly locked with a video processor: TDA 4780. Percentages work together with microudes of video videos: TDA6111Q. Peeling a video amplifier blue. Everything went, but not for a long time. I open, measure and detect the abrasion of the quage in the input chain<синего> Wu. SDL-5000 type. I call colleagues about this SDL-ki. Respond - the deficit, no, try to twist without it. I try. First just jumper. There is an image, but the leaders are observed in blue. Especially noticeable on video titers, teletext, menu .. I put similar jumpers in similar chains of red and green, such as try to align them. On the screen full catatavation. All three colors were driving as if the ring was twisted. I return everything to the original, I take the ice-0.33 of the old telephonnicine (it is significantly compacting ours) with a piece from it (how much I do not remember, somewhere 1/4 Part of the SDL-5000 delay time is significantly less than La SDL-0 , 33). I solder a third leg, foul by quick-drying glue, I will go and hurray, it has been working for about a year without problems.

28.) When turned on there is a raster with noise, noise in dynamics at full power, and nothing does not respond. There is no 5V processor power. The resistor of 100 Ohm 2W on the power supply of the pulse stabilizer of the processor is powered, the transistor Q881 2SC4004 between the collector and the emitter in the coal burned the plastic case. After stripping the burned area, the transistor turned out to be good. By installing the native transistor and change the 100 ohm, the pulsed processor food processor earned.

29.) After a month, SECAM disappeared. In Pal, everything is fine. I rummage all the chromaticity (M52778Sp-A, TDA8395P), everything is in order there. Suspicion Palo on EEPROM firmware (24C02). I did not find the firmware on this model, I used the firmware with the TX-21K1T (by a copy of the TX-21JT1P copy). After the EEPROM SECAM is enrolled, it just had a slightly adjust the sizes from the service menu.

thirty). Does not turn on. Whistle bp. It breaks through Stabilitron at 56 V, the condenser 220.0x50 by the power supply chain 35 V and the condenser 47.0x35 in the BP.

31). Does not turn on. The protection is triggered. K803 breaks (replaced by KT814G) and leakage between transitions in the transistor Q802 2SC1473 (replaced by KT851A).

Probably, many familiar the situation when the TV stopped submitting signs of life with its intention to include it. Now we are calm about this, as we understand that you can use another TV in the next room or in the kitchen, and repair the faulty machine with time. But, if you look back for about thirty, forty back, the TV refusal to turn on will be perceived as a big trouble. TV Then, despite the ideologicalness of programs, for many people was the only window into the world. Skip the series "Seventeen Moments of Spring" was not possible, and the experiences on this occasion seemed quite reasonable.

Undoubtedly, the technique over time has become more reliable and technological, its weight and dimensions decreased, many new user and multimedia functions have been added. However, currently also, as at the dawn of its formation, television receivers are sometimes subject to failures when turned on. The reasons for this can be quite a lot and not always the "culprit" of such a strange behavior is the device itself.

Make sure the reverse is simple enough. It is necessary to check the electrical outlet in which the wire from the TV is inserted. Connect the desk lamp to it and make sure it works. Remember where your device has a power button and is it at all. This is not a joke, many owners forget about its existence, using only a console remote control.

The range of television shows is so diverse and wide that even the master on TV in the model is not very famous for some time to detect the network switch. These elements of the scheme are used to hide in secluded corners and recesses, downstairs on the side, behind and be completely imperceptible. Randomly taped this button and without noticing this, then you can wonder for a long time "Why does not turn on?"

We repair yourself or trust the telemaster?

Of course, the situation with the button or bad socket is not typical and are rare enough, but with checking these things it is worth starting the diagnosis of the reasons why the "box" does not want to turn on. Most often it is to blame for all the same, the receiver itself and the owner has to make a decision, call the wizard or fix TV with their own hands.

For many men who consider themselves technically literate, does not seem so difficult. "There's just a fuse to replace the fuse, or something else, and for the repair you need a tester, a soldering iron and a scheme" - people think so, people confident in their power. However, the desire to repair the device can independently go on a decline after the cover from the device is removed and access to the cards and blocks of the modern TV is removed.

The fuse, which we used to see it, in the receiver, most often, one and in most cases it is intact if there were no farce major circumstances in the form of a thunderstorm or high voltage jumps in the electrical network. It may well be that the fuse has burned down on one of the boards, but most of the "fubuses" are now performed in sMD package And the search for a faulty can delay, since these components can be tens, and they are located in any television block. Determine visually their presence in the scheme and distinguish from similar appearance capacitors or resistors without proper skill are quite difficult.

Suppose the search was crowned with success. Here he is the burnt "FUUZ" (Fuse - fuse), which must be replaced and the hope that the TV will again please us with juicy plots and heartfelt stereo sound, will be a reality. However, joy can be premature. Questions should arise: "What a denomination of a faulty fuse?" And "Why did he burn?" If you do not think about these things and just to have a wire instead of spare parts, you can discover a lot of new things: see smoke from a large chip or hear cracking of exploding transistors. This means that you did not find the reason for the fuse brave and, as a result, significantly increased the cost of further repair.

The telemaster with experience wrapped on skouring hand the fuse jack in the power supply causes a sacred trepid, horror in the eyes and understanding that it is not possible to restore this device quickly and painlessly, not to earn a lot, and "sit" will have to go long, looking for and changing what is in everyday life Because of the order does not have. The most unpleasant in this case is unpredictability and lack of logic when searching for defective parts.

Analysis of the situation and evaluation of factors affecting the emergence of a malfunction, an integral part of the professional skills, which is experienced experienced. Finding the root cause, because of which various components of a television chassis may fail, including the main task of a specialist. It is impossible to repair, hoping for "maybe" without having a firm confidence that the defect will not happen in the future.

A simple example. Panasonic Kinesconic TV is not included. Measurements show that it breaks through the 56 volts stabilitron in the voltage chain of the tuner setting, which performs a purely protective function, and its presence or absence in a regularly working chassis is completely optional. In fairness, when repairing with your own hands, the replacement of this part leads to its re-brave. If the stabilion does not put at all, the TV may turn on and work for a while until the lowercase transistor is burning, a personnel chip or string transformer. The cause of such behavior in an overestimated voltage, which gives the power supply, and if it is even deeper, in the loss of the nominal capacity of two electrolytic capacitors by 47MCF. In the primary circuit of this block. This is the root cause of all troubles.

A lot can be told about why the TV does not turn on. This note was focused on the human factor in such a situation and that always, when repairing the TV, as, however, and any technically complex device, you should look for the cause and eliminate the consequences, it caused. It is not always an attempt to restore the television's performance on their own forces will end luck. To such a turn, you have to be prepared and a hundred times to think, before you decide on this step. May be worth it

When you turn on the TV lights up the network fuse

The malfunction is in the power supply. Initially, there is a visual inspection of the board, paying attention to the burnt elements, darkening on the board caused by thermal overload. Faulty electrolytic capacitors can be defined by swelling from above, breaking the safety notches, the electrolyte trails on the board.

Then measure the resistance of the chain at the outputs of the electrolytic filter condenser. It should be more than 10 com. Otherwise, for the localization of the defect, the circuit is broken between the plus of the capacitor and the collector output or the power supply chip and the resistance is again measured. If the resistance is normal, then the malfunction in the transistor or chip, if not enough, the malfunction can be in the filter condenser, rectifier diodes, network filter elements.

The integrity of the transistor or output transistor embedded in the PWM counterpper is determined check R-N transitions. When checking diode assembly D803 must be remembered that each of the four diodes is checked. The outstanding D803 is replaced with a similar or install 4 diodes with parameters: direct straightened current LNP\u003e 2 A, reverse voltage u arr.\u003e 400 V.

The reason for the defect is often a breakdown of ceramic capacitors (short circuit) included parallel to the bridge diodes. Temporarily allowed work without capacitors. In electrolytic capacitors, a breakdown is possible (short circuit) or a significant increase in leakage current. Determined by the tester.

A malfunction can be in the thermistor D801 - short circuit over the network.

A malfunction can be in one of the elements of the network filter, although the edge occurs not rarely.

TV does not turn on, network fuse is intact. No voltage on the filter condenser

In this case, check the presence of voltage at the input of the rectifier, at the input of the network filter. A frequent defect - simultaneously with the failure of the diodes of the rectifier or the transistor of the power supply, fails of the rupture resistor R801. It is set to 1-3 Ohm with a ratio of 5-7 W. In the absence of a suitable typenip, a jumper from a stranded wire is established, for example MGTF-0.1. One veins takes. Such a home-made fuse withstands the current to 2.4 A.

TV does not turn on, network fuse is intact. The voltage on the filter condenser is normal (U \u003d + 300 V)

A malfunction can be either in the power supply or in secondary power circuits. With a significant reduction in load resistance or short closure, the power supply converter will not start.

Ommeter Check the resistance of the +140 V power circuits, +8 V, +22 V, +15 V.

The check is starting from the chain +140 V. Resistance should be R\u003e 10 com. Otherwise, faulty can be: D856, C853, C852, D852, lowercase transistor Q551.

After checking the elements in secondary circuits, go to the inspection in the primary. Check the following elements: Q801, Q810, Q802, D825, D820, R821, D821. It is especially carefully necessary to check Q802 and Q810. A good transistor falling out of the scheme should be an exemplary equality of the transition resistance base-emitter, the base-collector (direct). The distinction difference is 2-3 times indicated by the malfunction of the transistors. If there is a transistor parameter meter, it is recommended to use it. A frequent defect is an increase in R814, R815 ratings. At the same time, the initial displacement does not come to the base of the transistor Q801 and it is constantly behind the indoor. The same result leads to the D810 stabilion breakdown.

TV does not turn on. Intermittent high-quality sound is heard from the power supply

The cause of the defect may be a decrease in resistance or short circuit in the load. Check Stabilitron D856, line transistor Q551, resistance by power circuit: +8 V, +22 V, +15 V, +14 V, lowercase transformer. In addition to the breakdown on the "Earth" in the T501 collector winding, it can be a breakdown by high voltage voltage of the winding. TDCS malfunction can be determined often visually on the intake of the plastic case, traces of the breakdown on the board between the outputs, according to the burnt items connected to the output of the ot.

Indirectly about the fault in TDKS can be judged by the following check. A jumper is installed between the base and emitter of the line transistor, while the transistor is locked and oscillations in TDKS are missing. If the +140 B voltage appears, then there are short closed turns, trifles of windings on the housing or malfunction in the high-voltage part, including a breakdown in a kinescope.

Sometimes there are several faults at once. For example, the breakdown of the line transistor occurs simultaneously with the failure of electrolytic capacitors over the secondary power circuits. This is the result of exposure to elevated 2-3 times voltages at the output of the power supply. This occurs as a result of the failure of the key transistor control circuit. Moreover, the failure may be short-term, after which the normal work is restored. The key transistor issues the maximum possible voltage exceeding work voltage electrolytic capacitors for secondary power circuits. After replacing the elements of the elements, the defect is repeated. With this malfunction, first of all verify Q802, as well as D824, IC803.

The cause of the defect may also be the loss of the container with a filter capacitor. The voltage on it is understated until the magnitude of 200 ... 250 V instead of 300 V and almost immediately falls to 0 in after the TV is turned off.

A similar defect occurs with strong mechanical effects - shocks, falls. First of all, check the printed installation for cracks. Usually they are formed at the installation site of TDKS and the line transistor.

TV is in standby mode. Red duty mode LED is on. When switching to the operating mode of the LED on 1-2 with goes out, then it turns out again

A malfunction can be in the blocks of the line and frame sweep, a kinescope, a power supply, a microcontroller, as well as in the protection scheme.

TO possible reasons The faults listed in paragraph 5 should be added as follows.

The TV will not turn on in the operating mode if one temporarily two buttons are pressed on the front panel. This is due to the malfunction of the buttons or "jealing" buttons due to the skewer of the case.

A malfunction can be in MK. It is checked for the presence of +5 B output. 61, 22 IC1101, quartz performance, the operation of the RESET scheme. The RESET schema is working normally, if when you turn on the TV display. 54 IC1101 A short time is held with zero potential, while the voltage increases to +5 V. Then check the presence of high output potential. 35 IC1101 when switching to work. Trace the passage of high potential to the Q846 base. Check Q845, Q846, lack of high output potential. 35, when switching to operating mode from the duty, indicates the malfunction of the MK.

The screen does not shine. No sound. High voltage there is

The presence of high voltage voltage is easy to detect, having spent palms near the surface of the kinescope screen. At the same time, the action of static electricity will be felt - light tingling in the fingers, accompanied by a quiet crackle of discharges.

First check the presence of heat on the kinescope. The luminescence of the thread can be seen from the neck. If the glow is absent, measured the gas voltage oscilloscope on the kinescope board. The amplitude of the pulses is U \u003d 22-24 V. and in conclusion, the thread of the glow of a kinescope is nosed. Malfunctions occurring here: breaking the filament in the kinescope (replacement of a kinescope), disruption of the soldering of the heat wires on the main chassis, bad contact of the kinescope panel with the conclusions of the kinescope.

Another possible malfunction is the failure of the video processor IC601 AN5693K. It is necessary to increase the accelerating stress. If the screen is being launched, it is defective, apparently, the video processor. Check the presence of R, G signals, in the input of the kinescope fee, the reliability of connecting the connector R, G, B, and the presence of signals directly at the IC601 conclusions. Set the maximum value of brightness, contrast and saturation.

If the output signals are missing, and the supply voltage at the outputs 14 - +9 V and 35 - +5 V and the video signal enters the output. 31 IC601, then IC601 must be replaced.

The lack of screen glow can be caused by the absence of accelerating voltage. For this measure the range of changes in the accelerating voltage. It should be u \u003d 200-800 V. If it is missing or not enough, then the following faults are possible: no voltage with TDKS, a breakdown in a kinescope, a filtering capacitor breakdown on a kinescope board.

The screen glows brightly, the return line is visible. No image

Possible reasons: Little power supply voltage, located on the kinescope board, the malfunction of the video processor.

Measure supply voltage. It should be equal to 200 V. If the voltage is underestimated, check C502. If there is no absent, then check the elements: C502, D501, D502, R501, L501, about the motor 1 - 4 T501.

Reducing the supply voltage leads to a disconnection of the video processor. In this case, the transistors of video sellers are fully open, which causes a decrease in voltage. At the inputs of video amplifiers, great positive potential. Before making the final conclusion about the health of the video processor, you need to check the signals at the input and supply voltage (see paragraph 6).

The screen is littered with one color. No images

Possible malfunctions: Video processor IC601, transistor breakdown of a video amplifier, interelectrode closure in a kinescope.

Check the oscilloscope input voltage of the corresponding video seller. If u \u003d + 5 V, then additionally check IC601 - input signals and supply voltages, after which they change the chip.

The transistor's breakdown is determined by the melometer. Pretty frequent malfunction - a break of the resistor in the collector's chain.

With interelectrode closure in the kinescope, the voltage measured at the corresponding cathode oscilloscope is 0 V. Blancating impulses are absent. For the final rejection of the kinescope make the following test. All external chains are disappeared from the cathode. Between the cathode and the +200 V chain, the resistor R \u003d 10 com. Then the TV includes and measure the voltage at the cathode. If the voltage on the cathode is 0 V, and the screen is littered with the appropriate color, then in the kinescope, an inter -ephectrous closure.

Faulty personnel sweep

The framework malfunctions include an increase or decrease in vertical size, linearity breakdown, complete absence of frame scan (horizontal line).

In the absence of frame scan, first check the supply voltage IC401 type LA7833S output. 6. The voltage must be equal to 30 V. In the absence of checking the chain: R434, C507, D505, R504. Last resistance fails most often. Then check the presence of sawtooth voltage at the input (out. 4). Check the personnel OS. Its resistance is the units of OM. Check the reliability of connecting the OS connector. Check the condition of C40E, R404, R408, as well as the serviceability of the chain feedback: R416, R402, C407, R403. In conclusion, IC401 change.

In case of impairment of linearity and size vertical, the supply voltage and elements in the OOS circuit are checked. For example, if the image is stretched in the upper part, it indicates no power supply sufficiency. Tested primarily R504, with which often the malfunction is expressed in increasing the nominal value of 1 ohm to 10 ohms. When checking an ohmmeter at the limit 1, no serviceability can be detected.

Raster size horizontally not normal

The need for adjustment usually occurs after the replacement of TDKS or a kinescope. In this case, the capacitance of the condenser condense C555, C556 is selected. The size of the horizontal increases with increasing capacity.

When replacing the kinescope, you need to install a new kinescope only Panasonic firms. When installing a kinescope, another firm horizontal size will be reduced by approximately third. It is not possible to restore the normal size of the selection of capacitors. The fact is that the parameters of deflecting systems are very different. As a last resort, the kinescope is possible to install another firm, but with a "native" deflecting system. At the same time, you will have to repeat completely alter the color of color purity, information.

Violated centering raster horizontal

Eliminated by adjusting B. service mode. The entry into the "Service" is described in the "Adjustment" section. If the defect is completely eliminated, it is necessary to replace IC601.

Raster has a shape of a parallelogram, trapezoid, circle, raster edges are not parallel

screen framing

The cause of the malfunction is likely that the OS moved from the cylinder of the kinescope. This is the result of mechanical impacts. First you need to try to install it for your previous place and stronger tighten the mounting screws. Then check the reduction. If the reduction is unsatisfactory - to again bring off the deflecting system.

Color cleanliness is broken on the screen of the kinescope (rainbow divorces, color spots)

Initially, you need to ungive the kinescope with the help of an outer loop. If it fails, then try to continue to bring off the deflecting system. Otherwise, the displacement of the Kinescope mask takes place. Defect will not eliminate. It usually occurs due to mechanical impacts.

There is no image and noise. Raster

The oscilloscope check the amplitude of the output signal. 31 IC601. If it is equal to 1 B, then change the chip. If there is no signal, then check the chain: an output. 31 IC601 - withdrawal. 20 IC201 - output. 18 IC101 - output. 45 IC101 - X101 - IF Tuner output.

Image in noise. Times disappears

The presence of noise suggests that the converter in the tuner works, as well as all the cascades after the converter. Either antenna, or UHF tuner can be faulty. To check the TV input, the GIS is connected to the calibrated output voltage. If at the same time noise on the signal disappear, then the tuner works normally, the antenna is defective. A video recorder with HF output can be used as a signal source. If the signal is still weak and roaring - the tuner is defective. The most common defect is the trifles of the UHF transistor.

Not included one of the ranges of VN, BU

Turning on the tower ranges is carried out with a voltage of +12 V to the corresponding Tuner input BL, VN, BU via the IC1105 range switch chip. The command is steps out. 47, 48 MK in the form of a binary code, decrycted in IC1105 and enters the tuner. Possible malfunctions: MK, IC1105, TU01.

No settings inside the range

Include auto-receiving mode and control the voltage at the TU tuner's output. It should be smoothly changed from 0 to 31 V inside the range. If this is not, then check the voltage at the input buffer Q1180. Here there must be impulses amplitude of 5 V with a changing duty.

Then check the voltage at the output of the integrator R1154, C1151, R1155, C1150. The range of change is the same. In conclusion, the signal is controlled at the output 46 IC1101. It is a sequence of pulses with a changing duration of amplitude of 5 V.

Changed the channel setting (over time)

Control voltage at the tuner TU pin using a digital voltmeter. If it is constantly and does not change over time, the tuner is faulty. If the voltage changes, then the capacitors C1180, C1181, C1182, C102 in the integrator are checked. Faulty elements replace.

The "Function" button on the remote control and the front panel does not work. Major audio adjustment range (from about 12)

This defect is characteristic. this type TV when overflowing memory cells. It occurs with a strong impulse interference over the network. To restore normal performance, it is necessary to submit a sequence of commands from the remote control: F, N, F, +, -, N, and so on 5-6 times. If you cannot restore the television's performance, it is transferred to the SNK mode and fed commands F, N, N. If it does not help, change the IC1102 memory microcircuit.

Do not pass commands with remote

At the beginning, the power console is tested (Fig. 13). The supply voltage should be equal to 3 V. Then check the remote. Any infrared photodiode can be used as an indicator, such as PD-8K. Diode conclusions are connected to the oscilloscope - one to the signal input Y, the other on the housing. The diode is located in the immediate vicinity of the remote control so that the FD is directed to the PD side. Then you press any button on the console. The oscilloscope will appear in the form of a bundle of pulses of different duration amplitude of 0.5-1 V. If there are no pulses, then a malfunction in the remote control.

Check the presence of cracks on the board, quality of quartz, transistor, chip, LED. The cause of the malfunction is often an increase in surface resistance (R\u003e 5 com) of keyboard closure contacts. The console can be repaired by gluing the pieces of metal foil to the buttons.

If I moved, the oscilloscope check the presence of an output signal. 1 IC1101. If the Sig island has and commands from the front panel are executed, then change IC1101. Otherwise, I am a photodiode.

There is no sound and noise in the loudspeaker. Image in normal

Initially check the loudspeaker winding in the module. Then the oscilloscope control the signal at the output IC 2302 (output 7, 12). If there is a signal, then check C2336, Q340. Then check the input signal (out. 3, 4) and the power supply voltage +25 to the output. 10 microcircuits. If the signals on the inputs and supply voltage are there, and there is no output, then change the chip. Control the presence of a signal at the inputs of IC2301 (out. 1, 22), the supply voltage is +12 to the output.

21, the presence of pulses on an output. 11, 12, the absence of a sound shutdown command is voltage to you. 8 should be equal to +4.4 V. Set the volume level in the middle of the scale. If under these conditions the output signal, output. 9, 14 is absent, then change the chip.

Check the passage sound signals Throughout the N. Purpose procedure is in the description of the work of the N. Board

There is no sound or strongly distorted sound. There are noise

Possible reasons:

The sound frequency standard is incorrectly installed (for Russia D / K);

About not comes with the MC team to switch the standard;

Oh faulty Filters PCs. First of all, the quartz resonators of the PCH are checked.

Check the passage of sound signals on the chain: an output. 7 IC101, output. 13 IC101, Q160, output. 15, 13, 11 IC201, output. 9 IC201, output. 11 IC101, output. 10 IC101, Q140 - N. fee

As a result, find a faulty cascade, and then find a faulty element or a malfunctioning chip.