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, 12 March 2019

SYLVANIA 6637LCT SERVICE MODE POWER SUPPLY CIRCUIT INVERTER CIRCUIT

SYLVANIA 6637LCT SERVICE MODE POWER SUPPLY CIRCUIT INVERTER CIRCUIT


LCD TV

SERVICE MODE POWER SUPPLY CIRCUIT INVERTER CIRCUIT 

SERVICE MODE
1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV unit.)
3. Press [SLEEP] button on the service remote control unit. The following screen appears.
White Balance Adjustment
*This adjustment is required when reparing T-CON CBA.
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80% or APL 20%).
3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the
LCD-Panel surface after zero point calibration as shown above.
Note: The optical receptor must be set perpendicularly to the LCD Panel surface.
4. Enter the Service mode. Press [VOL DOWN] button on the remote control unit and select “C/D” mode.
5. When “x” value and “y” value are not within specification, adjust “DB (C/D)” or “DR (C/D)”.
Note: “DB(C/D)” or “DR(C/D)” must be adjusted within ±3%.
6. Turn the power off and on again. (Main power button on the TV unit.).
Auto Calibration
Purpose: To bring the color adjustment of each component into standard alignment.
Symptom of Misadjustment: If this adjustment is incorrect, component signals do not reproduce the corresponding color.
1. Input 11step Gray Scale signal (0 IRE-100 IRE / step by 10 IRE) into only Y terminal of Component 1.
2. Enter the service mode.
3. To enter the Auto Calibration adjustment mode,
press [6] button on the service remote control unit.
4. To start auto adjustment, press [CH UP] button on the service remote control unit.
- Upon completion, “Calibration Check OK” and
“Push FCH UP key” appear on the screen.
- If the auto adjustment failure, “Calibration Check NG” and “Push FCH UP key” appear on the screen.
5. Unplug AC cord and plug it in AC outlet again to reset then enter the service mode again.
Flicker Adjustment
*This adjustment is required when reparing T-CON CBA.
1. Enter the Service mode.
2. Press [2] button on the remote control unit. The following screen appears.
3. If Flicker Adjustment is not fit, the screen become the following.
4. Turn the VR1 on the LCD Module so that flash stops.
Initialize the LCD television:
1. To turn the power on, press [POWER] button on the normal remote control unit or the unit.
2. Use the service remote control unit. (Refer to “ELECTRICAL ADJUSTMENT INSTRUCTIONS” section.
3. To enter the service mode, press [SLEEP] button on the service remote control unit.
- To cancel the service mode, press [TV POWER] button on the remote control.
4. To initialize the LCD television, press [DISPLAY] button on the normal remote control unit.
- “INITIALIZED” (red) appears on the screen.
- After few seconds (completion initialization), the screen is reset.
Purity Check Mode
This mode cycles through full-screen displays of red, green, blue, and white to check for non-active pixels.
1. Enter the Service mode.
2. Each time pressing [7] button on the service remote control .
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN

INVERTER CIRCUIT 
CLICK ON THE IMAGE TO ZOOM IN
Posted By: FRANK at 10:51
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