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 !

Tuesday 5 February 2019

RCA L32E9A – TCL 32M91HD LCD TV SERVICE MODE – SMPS CIRCUIT DIAGRAM - ADJUSTMENTS

RCA L32E9A – TCL 32M91HD LCD TV Service mode – SMPS circuit diagram - Adjustments

LCD32E9A-MS91LA TCL L42E77F 
How to access to Factory Menu
1. In TV mode, press MUTE button of remote control to mute the set.
Press MENU button to enter user main menu, and choose CONTRAST item in PICTURE menu and press 9,7,3,5 buttons in series. (within 5 seconds) 
Factory Menu will appear in the left top of screen.
2. Press RETURN button when FACHOTKEY is enabled (ON).
(After upgrading the software for the first time. Restart the set (power off then power on) should be made to ensure the correct EEPROM data.)
How to access to R&D Menu
1. In TV mode, press MUTE button of remote control to mute the set.
Press MENU button to enter user main menu. Then choose CONTRAST item in PICTURE menu and press 1,9,5,0 buttons in series. R
&D Menu will appear in the left top of screen.
2. Press RETURN button when Design Menu > DESIGNKEY is enabled (ON).
3. Press MENU button of remote control under FM.
DEBUG BOARD
During production the Debug Board will be used to upgrading software, adjust White Balance. 
The function of the board is transfer TTL Voltage to 232 Voltage. 12V DC power supply should be provided through ON1/CON2.
The steps of debug during production
Manual adjustment of White Balance and ADC calibration:
1) ADC calibration
Input dual 16 grey scale signal 1024*768/60Hz(Chroma2225 Pattern47,Timing38 or Chroma2327 Pattern47, Timing14) from VGA socket
Input 8 color bar with 100% saturation(2327 Pattern37, Timing33 or BSG360A Timing79, Pattern85), PAL system from Y,Pb,Pr socket.
Enter ADC item of Factory Menu, select the source which you are going to calibrate.
Then select AUTO TUNE and press Vol- button in remote control.
Note: First confirm the input signal pattern and format are correct. After calibration, If the grey scale cannot be distinguished, calibrate again until it is distinguished.
Color Temperature adjustment.
Before adjustment you should confirm the color analyzer has been calibrated. During the process, only AV1 Y,Pb,Pr,VGA source should be adjusted. We recommend you use CA210 color analyzer(0 channel),because it is more accurate.
Connection of devices
1) connect CON3 of Debug Board to CA210(input VGA signal to CON6 when adjust VGA source. Connect CON5 of Debug Board to the set through VGA cable. Input corresponding pattern required, then select GAIN AUTO, press Vol+ button of remote control.
2) Input 8 grey scale signal of 5418 from AV1/Y,Pb,Pr/VGA source. Point the optical lens to the fourth brightest scale. Then enter Factory Menu and select WHITE BALANCE page, select GAIN AUTO, press Vol+ button of remote control.
Note: In the process of adjustment, you can press MUTE button of remote control to cancel.
SMPS schematic
Block
Display panel
1. Check the inverter voltage 24V if supply for Panel,also view the panel have backlight. 
If have backlight,it shows that have inverter voltage supply.
2. Check if have voltage of Vcc-panel for CMO panel. LG-PHILIPS L32OW 12V. Some other small size panel is 3.3V.
3.Test waveform of LVDS if OK, LVDS OK but no display, replace the panel.
Attention: Do not remove the LVDS connector when the TV working or contact U300 only time,to avoid shock U300
Posted By: FRANK at 01:48
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