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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 8 March 2019

SYLVANIA 6842PE M SERVICE MODE AND POWER SUPPLY CIRCUIT

SYLVANIA 6842PE M SERVICE MODE AND POWER SUPPLY CIRCUIT


SYLVANIA 6842PE M 

SERVICE MODE AND POWER SUPPLY CIRCUIT 


How to make service remote control
1. Prepare normal remote control unit. (Part No. N0121UD or N0134UD) Remove 3 Screws from the back lid.
2. Add J1 (Jumper Wire) to the remote control CBA.
Pic 1
HOW TO ENTER TO SERVICE MODES
Service mode
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.
3. Press "SLEEP" button on the service remote control unit
4. Confirm the following
a. Version of main micro computer --- K798-016
b. Memory size --- 4
c. FLASH DATA Chek Sum (press "0" button on the service remote control unit) --- C97A
HOW TO INITIALIZE SETTINGS 
1. To turn the power on, press "POWER" button on the normal remote control unit or the unit.
2. Enter the service mode.
3. To reset to factory setting, press "DISPLAY" button on the normal remote control unit.
- "INITIALIZE" (red) appears on the screen
After few seconds (completion initialization), color of "INITIALIZE" will change green.
V-data Adjustment
1. Operate the unit more than 20 minutes.
2. Input an APL 100% white VIDEO signal.
3. Adjust VR2350 so that the voltage of J2198 becomes 67±0.5 V
V-sus Adjustment
1. Operate the unit more than 20 minutes.
2. Input an APL 100% white VIDEO signal.
3. Adjust VR2250 so that the voltage of J2164 becomes the specified voltage as shown on the panel label locating on the up-right of the back on the PDP Panel.
White Balance Adjustment
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.
Notes:
To only enter the service mode, use service remote control unit.
This adjustment should be performed in Video 1 mode.
1. Operate the unit more than 20 minutes.
2. Input the gray scale pattern signal (5 scales) from Composite AV Input (1) video jack (Video1).
3. Set the color analyzer to the CHROMA mode and after zero point calibration, for high light adjustment, bring the optical receptor to the 2nd scale
4. Enter the Service mode.
5. Enter the component adjustment mode, press
"VOL DOWN " button once on the normal remote control unit
6. Press "4" button on the normal remote control unit for Red adjustment. Press "6" button on the normal remote control unit for Blue adjustment.
7. In each color mode, press "CH UP / DOWN" button to adjust the values of color.
8. Adjust Red and Blue color so that the temperature becomes 9200°K-5MPCD (x: 288 / y: 288) ±3%.
9. For low light adjustment, bring the optical receptor to the 4th scale
10. Press "1" button on the normal remote control unit for Red adjustment. Press "3" button on the normal remote control unit for Blue adjustment.
11. In each color mode, press "CH UP / DOWN" button to adjust the values of color.
12. Adjust Red and Blue color so that the temperature becomes 9200°K-5MPCD (x: 288 / y: 288) ±3%.
13. Check adjustment value in high light adjustment again. If adjustment value is not within specification, repeat steps 2-8.
14. To enter the adjustment mode in the Composite mode (Video 1 mode), press "VOL DOWN" button once on the normal remote control unit.
INITIALIZE THE PLASMA DISPLAY
To put the program back at the factory-default, initialize the Plasma Display as the following procedure.
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.
3. To enter the service mode, press "SLEEP" button on the service remote control unit.
4. To reset to factory setting, press "DISPLAY" button on the normal remote control unit.
- "INITIALIZE" (red) appears
POWER SUPPLY CIRCUIT 
MAIN POWER 


STANDBY  POWER SUPPLY 
CLICK ON THE IMAGES TO ZOOM IN
Posted By: FRANK at 05:28
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