REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Wednesday 5 August 2020

REPAIRING / SERVICING TV SUPRA STV-LC4268

Technical description and composition of the SUPRA STV-LC4268 TV, panel type and modules used. The composition of the modules.
SUPRA
Model: STV-LC4268
Chassis / Version: B.TRTD5C
Panel: LC420WX3
Inverter (backlight): 6632L-0330A, 6632L-0331A
MainBoard: B.TRTD5C 6512
IC MainBoard: T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052
Tuner: JS-6B2 / 121
Appearance
SUPRA STV-LC4268
General recommendations for TV LCD repair
Power module malfunctions can be expressed in different ways, for example, SUPRA STV-LC4268 does not turn on at all and the control lamps on its front panel do not light up or blink, all signs of operability are absent. It should be noted that the processor power regulator (converter) may be faulty with the same external manifestations. It is advisable to start diagnostics of the power supply module by checking the condition of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. In the event that the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors, which are often found in a breakdown state in such situations.
Power switches in switching power supplies (SMPS) fail for no reason very rarely and, in case of their breakdown, it is necessary to look for a malfunction in the stabilization circuits, checking electrolytic capacitors, semiconductor devices and resistors in the primary circuit. The reason may be a malfunction of the PWM regulator microcircuit, which can only be checked by replacing it with a new or known good one.
Sometimes the SUPRA STV-LC4268 TV may have no picture, or it appears and disappears immediately. In this case, there is a high probability of a malfunction of the backlight converter, or the lamps themselves, which can be checked by replacing. In such cases, it is necessary to make sure that all electrolytic capacitors of the filter are in good working order for the power supply of the inverter itself, including the power supply unit (power supply unit). When turning off the protection in order to ensure the possibility of diagnosing the malfunction, special care should be taken, and after all repair work is completed, it is imperative to restore the circuits and the operation of the inverter protection for the further safe operation of the TV.
Detailed composition of the Main Board: B.TRTD5C 6512:
Control processor: T5BS4-9999 F0009E02b Video processor: SVP-CX32 (under the heatsink), EEPROM: 24C64
39VF088, HY57V643220DTP-6, STC12C4052A, LVC573A, SiI9011CLU, CM2021, MSP3415G, TDA7265, HC4052D, LVC14A, Tuner: JS-6B2 / 121.
Repair or diagnostics of the B.TRTD5C 6512 motherboard should start with checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052 with new or known working ones.
Owners of the STV-LC4268 TV are advised to contact only qualified specialists with experience for repair! Attempts to repair yourself without the appropriate knowledge and skills can lead to serious negative consequences!

 DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->  24C64 SUPRA STV-LC4268, Main: B.TRTD5C 6512, Panel: LC420WX3


 The appearance of the MainBoard B.TRTD5C is shown in the figure below:
B.TRTD5C
B.TRTD5C can be applied in TVs:
SUPRA STV-LC2662 (Panel V260B1-L01 REV.C1), SUPRA STV-3268 STV-LC3268 (Panel V320B1-L01 Rev.D1), SUPRA STV-LC4268 (Panel LC420WX3).
Main features of SUPRA STV-LC4268 device:
Installed matrix (LCD panel) LC420WX3.
The inverter 6632L-0330A is used to power the backlight lamps.
The necessary supply voltages for all nodes of the SUPRA STV-LC4268 TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a B.TRTD5C module, using microcircuits T5BS4-9999, SVP-CX32, 24C64, SST39VF088, TDA7265, STS 12C4052 and others.
The JS-6B2 / 121 tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420WX3-SLC1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.25x523.01 mm
Posted By: FRANK at 07:08
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