Do-it-yourself kinescope repair of hitachi TVs

In detail: do-it-yourself kinescope repair of hitachi TVs from a real master for the site my.housecope.com.

HITACHI CMT 2057 1) After an attempt to start, the operation of the power supply is blocked. The reason - R913 (from the 111V rectifier to the optocoupler LED) is open. 2) Does not go into working mode. Reason - Q117 is faulty, stabilizer + 5V for m / controller. 3) When switching to operating mode, the line voltage drops to 75 V Cause - Q907 is faulty (bypasses the optocoupler). It rings like a whole.

Hitachi P - 740 Processor CCU SALO-9, memory 2402 - no indication when turned on, raster is dark, “high” is present. The reason is in memory - garbage is recorded in the program settings. The cell address for the first program is 0x0104, the next program is 0x0108 (i.e. every 4 bytes), etc. You can cure it by writing zeros from cell 0x0104 and so on up to 39 programs, taking into account the above. In this case, the first memory cells, in which the settings for color, size, etc., were recorded, oddly enough, were not damaged. Working firmware is here.

HITACHI CMT2199 No power up startup or relaxation. With all serviceable elements, it is necessary to replace the transistor KTC3200 = 2SC3200.

Hitachi CS2114 -not incl. from the standby mode. Before this, the raster has decreased from all sides. Change TDA8362B. the same case was with VITYAZ TDA8362A there.

Hitachi-Fujian HFS-2125... Frame scan periodically disappears. Standard soldering of the pins of the personnel microcircuit does not lead to success. The reason turned out to be in the ring cracks around the “personnel” pins of the connector to the deflection system. This defect has been encountered many times.

HITACHI CMT-2199 does not turn on. Opening R902 in the base of the key transistor. It is worth similar to the launch chain, along the 33 K stripes.

Video (click to play).

Hitachi-fujian HFS-1425... When turned on from TPI, a sharp whistle is heard, it seems that the power supply is in short circuit mode. But no, the load is normal. The reason turned out to be in the electrolytic capacitors of the power supply, after replacing them the device started up, but there were problems with the sound - it was accompanied by an unpleasant squeak. The character of the squeak changed when adjusting the volume. The reason turned out to be in the capacitor С106 4.7 uF / 50V. It stands in a filter that smooths out pulses of variable duty cycle for volume control.

HITACHI CMT2130 no color in SEKAM dried capacity C5019 3.3 uF

HITACHI CMT-2199... The power supply unit is going into a razor. B + more than two hundred volts instead of 95. C953, C956-exploded, ZD952 - short-circuited. The reason is R962 breakage (47kOm).

Hitachi Fujian HFS-1425-II - A rare specimen, power is combined with line scan in one transformer. The power supply goes out of the way, which leads to a breakdown of the line transistor (V702 2SD1397). I carefully check the power harness, find the culprit for the spacing, the V902 2SC458 triode (open circuit). After replacing the latter with 2SC1815, I turn on the TV without a line triode, the power is normal at 120 volts. I solder it into the lines 2SD2499, turn it on, there is a narrow strip on the screen, I change R727 and IC601 (TDA3653B). Everything is OK! Yes, be careful when repairing, there is network potential across the entire chassis.

Hitachi CMT-2199 chassis S3... When turned on, the blinking bowls are observed. LED, no start. Measurement of voltage + V showed instead of 60V (standby mode) about 43V. The trimming resistor in the optocoupler circuit (in the open circuit) with a nominal value of 1 kOhm turned out to be faulty.

SALORA 20MF50VT, Hitachi CS1422P (F-series chassi) Turns on and turns off after a while, the LED gives four flashes. I noticed that at the RGB TDA8840 outputs, there is a constant level on the blue one. Replacement of R909; R913; R922-180 kOM on the CRT board solved the problem, one resistor “pulled” the other one cut off. D / K sound setting. We change the SAW that supports our standard, add SFE 6.5MHz and preferably a T6.5MHz filter (video). If, after re-soldering, the device will stop when setting off to the side, then we go to the service: by closing the 52 legs of the processor to ground. Next, we experimentally select the IF PLL parameter at address 15 (in my case, 7A). Program plus minus - address selection. Volume plus minus - change the value. Remember TV button. Remote control RC-5.

HITACHI S2165 MS failed while in standby mode. PSU on transistors. All transistors flew out, except for Q 952, as well as an optocoupler and small stabilizers.After the replacement, the TV turned on, but there is no sound. It was necessary to change AN 5726, but it was not available. Installed AN 7149, only hung 4 capacitors 47.0 * 50V from 1 and 6 pins to the case, from 7 to 8 (+ to 8) and from 11 to 12 (+ to 11), having previously disconnected all circuits from 8 and 11 pins. For smooth volume control of R 241 and R 242 (5.6 k), increase to 33 kOhm

HITACHI CP-2146TAE CP-2146TAE Fault: no startup (sometimes it can turn on) - solder 7805 IC952. The image is shifted to the right (the left side is a dark stripe 6-10 cm), on the existing image there is an overlay in the form of a repeat of the image - check the power supply of 8395, 3-pin 8v.

HITACHI CMT-2908... There is no color in SECAM. The capacitor on board the SECAM C509 decoder is dry (0.47-50V).

HITACHI FUJIAN HFS-1425 came with a malfunction after 5-10 minutes at the change of dark - light scenes, the size of the image floats, while nonlinearity in the frame appears and the color disappears. Replacing all the electrolytes did not help. The reason turned out to be in the V904 2SC2271 ON / ST.BY key. After installing a new transistor, the line scan protection began to work. In this model, the protection strictly monitors the voltage from the TDKS and the current of the line transistor. Turned the B + regulator 90 degrees and the power supply worked normally with a voltage of 113v. The old 2SC2271 transistor rings absolutely normally, the one installed in the output video amplifier works, when it is reinserted into the power supply, the defect repeats.

Hitachi C-2123MN There is no image or sound, there is a raster and service information, the TDA8842 video processor is very hot: TDA8842 replacement.

Hitachi CMT2192 with a power supply unit based on the ON4959 transistor. Fault: no start of the power supply unit. When inspecting the unit, no faulty elements were found, the starting circuit is in good order and there is 0.3V on the base of the key. But the TV does not show any signs. On the secondary circuits, I checked the personnel, changed the containers, the strapping of the scribe - everything seems to be in order. Instead of a load, I hung up a 60 w light bulb (removed the choke) along the 95v circuit, there is still no start. Then I applied secondary supply voltages 120v and 12v from another source: the line writer did not start, but a voltage drop across 12v was detected. The reason turned out to be in the power supply of the processor, instead of 5v it was 3.5v. The infrared light detector in the short circuit turned out to be faulty. The BU1508AX transistor in the Hitachi PSU works normally instead of the ON4959, although the BUT12 analog may fail.

HITACHI FUJIAN HFS-2176. Fault: at the output of the 110v power supply, it is understated to 45-55v. The standard replacement of the base capacity of the power switch in the power supply unit did not give any result. The same is 160v-100mkf. The capacitance C936 25v-470mkf of the 15v filter turned out to be faulty. The 12v stabilizer is powered by this voltage. Sincerely

Hitachi SMT 2191, chassis S3 Fault: the mains fuse of the power supply unit burns out. A detailed check of the power supply unit (on transistors) did not lead to anything. The reason turned out to be unexpected and rather commonplace - the thermistor of the demagnetization loop of the kinescope "whirled" (in the diagram ТН901). Native was not at hand, after a simple adjustment of the scheme, I installed the domestic CT15-2.

HITACHI C1475MN Fault: does not turn on, the secondary voltages of the power supply unit 5v (3v), 96v (50v) are too low, replacement of Q003 2SC1213. Installed KT645.

HITACHI CMT2141 late 80s release, bartered from Japan. Interesting thing - the power supply unit is galvanically connected to the network, optocoupler isolation AV / IN-OUT. Fault: no picture. The power supply unit turned out to be working properly, the SR is in order. Inspection revealed leaked C1132 100.0x16v electrolyte. The replacement did not help, but there was no more time. So I returned it to the client. Later they bring another one from the same batch with the same problem and the leaked C1132. The whole thing turned out to be electrolyte - it leaked down, corroded the copper around the terminal and corroded a couple of adjacent tracks UNDER THE PROTECTIVE MASK. Outwardly, this did not manifest itself in any way. The first TV was the same. By the way, these devices show excellently, and in fact they are 15 years old and this was the first defect of all time. Everyone would do that!

HITACHI FUJIAN HFS-2025... Fault: When the TV was turned on to the network, the image began to collapse vertically and horizontally to the center with an unpleasant sound, especially on bright subjects and when changing the picture, and the reason for this is a spontaneous change in the supply voltage of the output stage: +115 V. This malfunction was caused by the C910 22mkf-50v capacity in the power supply, although the main suspicion was 220mkf-160v capacity in the + 115v supply.

HITACHI CMT-2141... Fault: no color in SESAM. The culprit was C5019 3.3x50V.

Hitachi C21-TF560S Fault: it turns off after 5-10 minutes of operation, while TPI and STRF6454 in B.P. are very hot. Suspicion fell on TPI, and when it was dropped for rewinding, it turned out that ferrite burst and sank inside. After the ferrite was glued, the defect disappeared. After an hour of operation, TPI is slightly warm.

HITACHI CS-2506R / T... Fault: a narrow (about 5 cm) horizontal stripe in the center of the screen. Before this malfunction, the TV had white OX stripes at the top of the screen. Defective output IC KR TA8427K (analogue LA7830). The reason for its failure is a defect in the soldering of the output of the voltage-boosting capacitor 100mkFx35V, connected to 7 n. IC TA8427K.

Hitachi CMT-2141... Fault: the image is unstable, moving lines and frames. Limiting the video signal. Defective C732 47.0x50 connected to 18n. IC501 M51338SP.

Hitachi-Fujian Fault: poor starting of the power supply unit until it warms up - the power supply is whirring and the output is only 60 volts. The problem turned out to be a faulty capacitor C936 (470.0x25 V) in the rectifier circuit.

Hitachi CS2115T Fault: no startup. Open Q957 - BC548C

Hitachi C21-TF330S Fault: no power supply starting, replacing STR-F6454 did not help. The defect turned out to be in D915, a zener diode at 27V. Although it rings normally during the check, after the replacement the TV started working.

Hitachi CS2852TA. Problem: there is no image, when the Screen is enlarged, a horizontal line appears. The malfunction is banal burned out TDA8172, but there is a nuance. The 100.0x25V voltage boost capacitor is located far enough from the KR and if you do not track along the tracks, you may not find it in search of the cause of the malfunction. Was replaced by 100.0x35V. And this TV does not respond to the remote control with a faulty CD.

HITACHI C21-TF750S, V3AR chassis Fault: according to the client, it first turned off completely after two hours, then more and more often, until when the power button was turned on, the indicator simply blinks for a second and goes out. In this case, the output voltages completely disappear, the power supply stops working. During the diagnostics, it turned out that the limiting resistor R790A was poorly soldered according to the scheme, for the power supply + 110V, the PROT circuit. I fixed this and cut off the power supply completely. After soldering, everything worked as it should.

Hitachi CMT-2192 Fault: no startup. The reason turned out to be in the ZD1101 5V1, located near the processor.

Hitachi CMT-2199 Fault: turns off after 3..5 sec. after switching on (the LED goes out completely). I increased the R962 rating to 47KΩ (it was 55KΩ) as part of the divider that determines the output voltages.

1) After an attempt to start, the operation of the power supply is blocked. The reason - R913 (from the 111V rectifier to the optocoupler LED) is open.

2) Does not go into working mode. Reason - Q117 is faulty, stabilizer + 5V for m / controller.

3) When switching to operating mode, the line voltage drops to 75 V Cause - Q907 is faulty (bypasses the optocoupler). It rings like a whole.

429.) Hitachi P - 740. Processor CCU SALO-9, memory 2402 - no indication when turned on, raster is dark, “high” is present. The reason is in memory - garbage is recorded in the program settings. The cell address for the first program is 0x0104, the next program is 0x0108 (i.e. every 4 bytes), etc. You can cure it by writing zeros from cell 0x0104 and so on up to 39 programs, taking into account the above. In this case, the first memory cells, in which the settings for color, size, etc., were recorded, oddly enough, were not damaged. Working firmware is here.

554.) HITACHI CMT2199. No power up startup or relaxation. With all serviceable elements, it is necessary to replace the transistor KTC3200 = 2SC3200.

613.) Hitachi CS2114 -not incl. from the standby mode. Before this, the raster has decreased from all sides. Change TDA8362B. the same case was with VITYAZ TDA8362A there.

645.) Hitachi-Fujian HFS-2125. Frame scan periodically disappears. Standard soldering of the pins of the personnel microcircuit does not lead to success. The reason turned out to be in the ring cracks around the “personnel” pins of the connector to the deflection system. This defect has been encountered many times.

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2193.) HITACHI FUJIAN HFS-2025. Fault: When the TV was turned on to the network, the image began to collapse vertically and horizontally to the center with an unpleasant sound, especially on bright subjects and when changing the picture, and the reason for this is a spontaneous change in the supply voltage of the output stage: +115 V. This malfunction was caused by the C910 22mkf-50v capacity in the power supply, although the main suspicion was 220mkf-160v capacity in the + 115v supply.

2230.) HITACHI CMT-2141. Fault: no color in SESAM. The culprit was C5019 3.3x50V.

2274.) Hitachi C21-TF560S Fault: turns off after 5-10 minutes of operation, while TPI and STRF6454 in B.P. are very hot. Suspicion fell on TPI, and when it was dropped for rewinding, it turned out that ferrite burst and sank inside. After the ferrite was glued, the defect disappeared. After an hour of operation, TPI is slightly warm.

2455.) HITACHI CS-2506R / T. Fault: a narrow (about 5 cm) horizontal stripe in the center of the screen. Before this malfunction, the TV had white OX stripes at the top of the screen. Defective output IC KR TA8427K (analogue LA7830). The reason for its failure is a defect in the soldering of the output of the voltage-boosting capacitor 100mkFx35V, connected to 7 n. IC TA8427K.

2551.) Hitachi CMT-2141. Fault: the image is unstable, moving lines and frames. Limiting the video signal. Defective C732 47.0x50 connected to 18n. IC501 M51338SP.

2712.) Hitachi-Fujian Fault: poor starting of the power supply unit, until it warms up - the power supply is whirring and the output is only 60 volts. The problem turned out to be a faulty capacitor C936 (470.0x25 V) in the rectifier circuit.

2768.) Hitachi CS2115T Fault: no startup. Open Q957 - BC548C

2795.) Hitachi C21-TF330S Fault: no power supply starting, replacing STR-F6454 did not help. The defect turned out to be in D915, a zener diode at 27V. Although it rings normally during the check, after the replacement the TV started working.

2802.) Hitachi CS2852TA. Problem: there is no image, when the Screen is enlarged, a horizontal line appears. The malfunction is banal burned out TDA8172, but there is a nuance. The 100.0x25V voltage boost capacitor is located far enough from the KR and if you do not track along the tracks, you may not find it in search of the cause of the malfunction. Was replaced by 100.0x35V. And this TV does not respond to the remote control with a faulty CD.

2809.) HITACHI C21-TF750S, V3AR chassis Fault: according to the client, it first turned off completely after two hours, then more and more often, until when the power button was turned on, the indicator simply blinks for a second and goes out. In this case, the output voltages completely disappear, the power supply stops working. During the diagnostics, it turned out that the limiting resistor R790A was poorly soldered according to the circuit, for the power supply + 110v., The PROT circuit. I fixed this and cut off the power supply completely. After soldering, everything worked as it should.

2812.) Hitachi CMT-2192 Fault: no startup. The reason turned out to be in the ZD1101 5V1, located near the processor.

2977.) Hitachi CMT-2199 Fault: turns off after 3..5 sec. after switching on (the LED goes out completely). I increased the R962 rating to 47KΩ (it was 55KΩ) as part of the divider that determines the output voltages.

3029.) Hitachi-Fujian HFS-2125. Fault: the TV does not turn on, the indicator on the front panel is on. Opening of the resistor R903 (82KOm) in the power supply.

3068.) HITACHI-FUYIAH (FR-14S40). Composition: LG863328A processor, video LA76810A, personnel LA7840. When enabled, there is no start of the lowercase. Burnt out 2SВ892 in the key for power supply of personnel and pre-exit lowercase. Replacement for KT837M. After the replacement, it heats up and there is no staffing. Reason: do not waste personnel.

3084.) Hitachi C21-RM39S V3ar Chassis. Fault: When the power supply is turned on, everything is normal, after the relay is triggered (within 1-2 seconds), the power supply goes into protection - it turns off completely and does not turn on until the 180x450 volt capacitor is discharged. The lowercase does not have time to earn. Repair: Eliminate the short circuit in the frame scan power supply circuit, the capacitor C605 -0.1 μF connected to the 6th leg of the TDA8356 is broken, in addition, the 16 volt PR764 fuse supplying the 3rd leg of the TDA 8356 was broken.

3094.) HITACHI CMT2195 Fault: when turned on for a few seconds, the screen lights up. The image is out of focus, reverse lines are visible, after which the TV turns off and it cannot be turned on again. When checking, it turned out that the C756 is not working properly

3174.) Hitachi CMT2192 Fault: does not turn on. Defective power supply unit. Breakdown of Q903 (ON 4959) requires replacement of R902 (33 kΩ). Changed the denomination, became 120 kOhm.

3239.) HITACHI CMT2191, MCL-437F (S3) chassis, 1996 release, power supply on ON4959 transistor. Fault: does not turn on, the power supply unit is silent, does not start. All transistors are intact. There are no electrolytes in the power supply circuit. There was an open circuit of the resistor R918 (46 kOhm) in the base circuit of the ON4959 transistor. (base ON4959-R903-R902-R918). Secret # 665 describes a similar case - there was a break in R902. Conclusion: the specified chain is rather weak, in similar HITACHI models. It is easy to diagnose.

3333.) HITACHI C2160FS Fault: when the TV is turned on from standby mode, the LED goes out, the line scan does not start. There are no horizontal pulses from the TDA8842 video processor, there are frame pulses. When checking, it turned out that there is no SDA signal at pin 8. Further search led to the TDA9859 audio processor, pin 17 of which showed 33 ohms per case. After unsoldering pin 17, the line started up but there was no sound in the left channel. Replaced TDA9859 and the TV worked fine.

3408.) HITACHI CMT2192 chassis S3. The power supply unit is faulty, the breakdown ON4959 was replaced with BU1508AX, well, as usual, the resistors and small transistors were changed. I turn on, the BU1508AX crashes. Again, I thoroughly check the power supply, except for the BU1508AX everything is alive. So I burned 3 transistors. The culprit of all the troubles was the demagnetization loop posistor, which is interesting, the fuse did not burn out.

It is impossible to imagine a modern apartment or house without video and audio equipment. This equipment is used every day and therefore breaks down more often than others. There are several ways to repair TVs: send the technician to a service center, call a qualified technician at home, or make repairs with your own hands.

Before you start repairing a TV, you first need to make sure what the problem is. This will also help if you do the repair yourself, and then when the master comes, you will be able to explain the situation to him.

There are several types of malfunctions that can most often be found when a TV breaks down.

The technique does not turn off.In independence, a CRT TV or a modern LCD model has broken down, this malfunction is associated with a blown fuse. Only different models have distinctive details from each other. You should also pay attention to the diode bridge - perhaps it was he who burned out.
In both domestic and imported models, the potential can often go astray, for the function of which the posistor is responsible.
If the plasma TV monitor is broken, then the problem, most often, is interference or drops, light or dark stripes may appear, color changes while watching a program or movie.
The problem may be a broken cord or a faulty outlet.

If we take into account all the troubles listed above, it is worth saying that the most difficult breakdown is considered to be a screen malfunction. For example, light reflections appear on your monitor after the liquid hits the matrix or the TV is hit, then it is better to carry it to the teleservice. Here it will certainly be repaired, and if the warranty period has not expired, then it will be free of charge or at a reduced price.

See also - How to choose a TV for your home in 2018?

You can try to fix some malfunctions of TVs yourself. And it doesn't matter here - these are LCD models, LCD or LED, it is not necessary to call the wizard if you are confident in your abilities. But caution never hurts, because such TV models are not cheap, and without having any repair experience or knowledge in this area, you can only harm and aggravate the breakdown.

Before you start repairing LED or LCD TVs, you must carefully read the instructions, and also study the principle of operation of your model. Anyone, even one far from this field, will understand that the repair of TVs such as LCD or LED will differ from CRT models. In the latter case, you are guaranteed not to run into a faulty PTC thermistor. The main thing here is to determine the problem, why does the backlight not work?

If you are repairing LCD, LED models, then the only difference here will be what kind of backlight is used. If it is an LCD TV, then the backlighting is produced using fluorescent or fluorescent lamps. For TVs, LED backlighting is produced using LEDs. At this point, the differences between LCD models usually end.

The breakdown may consist only in the fact that there is no power, in order to check this on an LCD TV, you can do the following with your own hands:

open the back cover of the model;
remove the wires connected to the matrix;
connect the working lamp to the contacts;
there are also LCD models in which more than one light source is provided. In this case, all sources must be tested. Just dismantle the matrix and plug your TV into the network - you can see which LED is the problem.

When a broken lamp in an LED or LCD TV is identified, it must be replaced. This stage requires maximum care from the master, as well as the manifestation of special attention. In some cases, the lamp is removed without removing the matrix, you just need to move the protection elements with a rubber gasket and pull out the lamp with a soldering iron. Similarly, it is necessary to mount a working light bulb. Now we can congratulate you - you did the repair of the LCD TV with your own hands! Just pay attention to one important nuance - the new light bulb must fully meet the parameters and dimensions of the broken one!

To repair TVs yourself, look carefully at the matrix! If there are "unhealthy" streaks here, then the breakage is in the matrix. Have a new part? Then everything is simple! You change it and turn on the TV, if it works, then you have accurately identified the breakdown.

If the reason for the breakdown of LCD TVs is the screen, then it is best to purchase new models of LCD or LED equipment.It is not recommended to change the screen of LCD and LED models, as it is impractical! This also applies to the LCD matrix.

What could be the problem with a malfunctioning plasma TV? If it is necessary to repair plasma TVs, then proceed in the same way as described above. Just adapt it to your specific case. This description can be applied to any model of plasma TV, just stock up on the necessary tools in advance.

Although today most users prefer to use plasma, many still watch programs on more outdated CRT models. Let's find out how to repair a breakdown in such TVs. Below is a step-by-step instruction that will help you repair your electron beam product with your own hands.

If you do not turn on such a device, check first of all the fuses. In these TVs, the back is made up of panels. Therefore, it is necessary to unscrew that part of the panels. Under such panels you will find a board and the power terminals must be connected to the fuse. They are connected to a conventional incandescent lamp, or rather to its base, after which the TV must be connected to the network. In the event that your equipment is in good working order, the lamp will go out after switching on, otherwise, when the fuse has blown, it will either not work at all, or it will constantly burn.
The diode bridge may also break. It should only be borne in mind that it is necessary to regulate and repair it only after making a dial. In this case, not only a multimeter is used, but also a product passport, which indicates the main parameters of this model.
The most difficult breakdown in a TV with a kinescope is a posistor. To check with your own hands, you must first turn off the power circuit, and then turn it on. In this case, the lamp must be monitored. If the work lamp goes out, then it can be said that the posistor is faulty. To make repairs, it is necessary to adjust the resistance of the network and only ventures to change this part.