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

AOC LE39D1440/20 SERVICE MODE AND POWER SUPPLY CIRCUIT

AOC LE39D1440/20 SERVICE MODE AND POWER SUPPLY CIRCUIT

AOC LE39D1440/20 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

Firmware Instruction
Step 1: Ready for F/W Upgrade
1.1 Change the software file name to “install.img”.
1.2 Prepare a USB memory. Copy the file “install.img” from your computer to the USB memory root directory, and
remove it from computer’s USB port.
Step 2: F/W Upgrade
2.1 Insert USB flash disk into TV’S USB
2.2 AC on the TV, the indicator light will shine after about tens of seconds, and the software will update automatically.
TV will auto restart after update the software.
2.3 After restart, press “menu+1999+back” keys in remote control into the factory menu. Check the version of MCU, and restart, software update is completed.
SERVICE MODE
Press "Menu +1+9+9+9+ Back" into the factory mode
Adjustment
White Balance Adjustment
1. In Component signal mode, Signal generator will select Tim 314, Pattern 141(80% White);
2. ENTER TO SERVICE MODE
3. Move the cursor to Current Source and choose component; Move the cursor to Color temp and choose color
temp(Cool, Normal, Warm), Move the cursor to the Gain and adjust RGB parameters to make the color temperature value within the cool color temperature specifications.
TROUBLE SHOOTING
No power
Power board output=5V? >Replace the power board
Check the IR board and LED
Replace the IR board
Replace the main board
Abnormal display
Enter factory mode to do “EEPROM initial”&“Reset”
Check the main board
Check the LVDS cable
Check the panel
Sound problem
Check the TV is muted, adjust the volume or enter the menu to reset?
Enter factory mode to do “Reset”
Check the speaker resistance value is in spec (Remark: The value is marked on the speaker)?
POWER ON PROBLEM Power board output＝12/24V?
Check the power key is under control?
Check the IR receiver is normal?
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGES TO ZOOM IN
Posted By: FRANK at 05:07
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