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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 8 February 2019

NJTCL TCL 21A71A – PAL-NTSC – CRT TV - SERVICE MODE - ADJUSTMENTS

NJTCL TCL 21A71A – PAL-NTSC – CRT TV - Service Mode - Adjustments

Factory Mode - Voltage Adjustments - EEPROM Data - Initialization - TCL 21 inch Flat CRT TV.
TDA7266 – TMPA8873CPNG - 24C08 – TDA4864AJ – MSP3425G – TEA1506P (SMPS Control) Chassis 40-M123SP- MAK1X-M123SP
  M123SP is NTSC-PAL system model developed for TCL market specially. In trial run, burn the software to TMPA8873PSNG IC by OTP method. After the trial run, make the mask, take care in production.  To solve the problems in production, for the workers participate in alignment, be familiar with the Alignment Procedure, and be master of the features.
There are 2 operation modes. User mode and factory mode. You can use the Remote control or buttons on the panel to operate in user mode, but only Remote control works in factory mode.
FACTORY MODE or SERVICE MODE
> Press D-MODE button on RC.
> Press OK and CH+ CH- to select the parameter you want to adjust.
> Press VOL+ VOL- to change the parameters.
> To quit factory mode, press D-MODE button (on the right of SURR button).
The factory data changed will be memorized.
Aging mode - used before the aging before alignment. The aging could start in factory mode.
Vertical stop mode - used to confirm the screen voltage. Press INPUT button in factory mode to enter Vertical stop mode.
Then press INPUT button again to exit.
White balance alignment mode—used for white balance auto alignment.
Press BUS OFF button near the left of MTS button to enter White balance alignment mode.
Factory mode - Press SOUND button in factory mode to initialize the set.
The screen displays WAIT after the initialization; the screen displays OK and exit the Factory mode automatically.
Then press D-MODE button again.
It will not enable you to enter Factory mode if you want to enter again; you need operate as follows;
Turn down the volume to 0 press Volume down button on the panel, press INFO button on the RC meantime.
X rays over voltage protecting circuit test
TV enter working mode, apply more than 26V DC voltage between two ends of C431.
The set should enter protecting mode or check X rays protecting circuit.
Initialization
> Under the factory mode press SOUND button.
> The screen displays WAIT.
> When the screen displays OK  the initialization finished. You can enter the next working procedure.
EEPROM DATA
Note: The items with * are adjustable.
The items with BLUE COLOR are work in CRT parameter.
Other items are not.  Do not adjust them.
Use TMPA8873*SANG(13-PA8873-PSP),D-Mode\ G2_FLAG04 posit 00
Use TMPA8873*SBNG(13-PA8873-PSPB),D-Mode\ G2_FLAG04 posit 40
TMPA8873
The TMPA8873CPNG is an integrated circuit for a PAL/NTSC TV. A MCU and a TV signal processor are integrated in a 64-pin shrink DIP package. The MCU contains 8-bit CPU, ROM, RAM,
I/O ports, timer/counters, A/D converters, an on-screen display controller, remote control interfaces, IIC bus interfaces and the Closed Caption decoder. The TV signal processor contains PIF, SIF, Video, multi-standard chroma, Sync, RGB processors.
Mask ROM: TMPA8873CMNG (ROM size: 32k)
Mask ROM: TMPA8873CPNG (ROM size: 48k)
Mask ROM: TMPA8873CRNG (ROM size: 56k)
Mask ROM: TMPA8873CSNG (ROM size: 64k)
OTP ROM: TMPA8873PSNG (ROM size: 64k)
Adjustment of B+ voltage.
> Receive Philips standard testing pattern to RF input.
> If the VR800 exists in the board, adjust it in STANDARD mode until voltage at following value
Model > M123SP >> B+ (v) > 110±2.0
Model > 21E10 >> B+ (v) > 110±2.0
Posted By: FRANK at 02:23
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