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 15 March 2019

CHANGHONG - 21NF55 _ 21PF93 – STR-G5653 _ SMPS SCHEMATIC (CIRCUIT DIAGRAM) _ SERVICE MODE

CHANGHONG - 21NF55 _ 21PF93 – STR-G5653 _ SMPS SCHEMATIC (Circuit diagram) _ SERVICE MODE


SMPS SCHEMATIC
CLICK ON THE PICTURES TO ZOOM IN
To enter the USER SERVICE mode
Caution: The user service mode adjustment can be changed only when service personnel adjust the whole set data during servicing. As the control data have dramatic effects on functions and performance of the TV, service personnel should not tell user how to enter the SERVICE mode to avoid improper data settings.
  • Set the volume to [0]. Then press and hold the MUTE button on the remote control, and  press the MENU button on the TV to enter the SERVICE mode . (In this case, the S mode cannot be stored in the EEPROM. 
  • To exit from the S mode, turn off the TV set.)
  • After entering the S mode, Red  “S” is displayed on the upper center of the screen and MENU1 is default.  Use the POS [+/ -] buttons to highlight an adjustment and the VOL[+/-]   buttons to adjust it. The adjusted data are immediately output and stored in the EEPROM.
Adjustment and Option Data in S mode
  • The items remarked with “ *” , not affecting functions of the whole set, can be adjusted depending on models.
  • The items remarked with “ ***” , affecting functions of the whole set, can be adjusted depending on functions of models.
  • To write in logo, use the  ↓/ ↑buttons to highlight an adjustment and the  < -- / à  buttons to adjust.
  • The data sheet may differ dependent on different models.
  • The data sheet may differ dependent on different CRTs for the same model.
KEY ICS TECHNICAL DATA
The super chips  TDA935X/6X/8X are good in pins compatibility. Differences among them are shown as follows.
 
TDA9351   48K   PAL/NTSC/SECAM+1 PAGE TELETEST
TDA9350   48K   PAL/NTSC+1 PAGE TELETEST
TDA9361   64K   PAL/NTSC/SECAM+10 PAGE TELETEST
TDA9360   64K   PAL/NTSC+10 PAGE TELETEST
TDA9380   32K   PAL/NTSC
TDA9387   32K   NTSC