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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 !

Monday 1 April 2019

LG50PQ30 - SET SHUTS DOWN AT TURN ON - PLASMA TV

SET SHUTS DOWN AT TURN ON - LG 50PQ30 - PLASMA TV


* Top or Bottom ½ of the picture is black. 
** SHUT DOWN AT TURN ON
* When the set turns on, either the Top or Bottom ½ of the picture is black.
# It is possible that the whole picture could be black if P207 or P207(Y-SUS) is involved.
# Look carefully the connections between the Y-SUS and Upper and Lower Y-Drive boards.
# It is possible that these can be improperly seated.
# Remove and re-seat the board correctly.   Note: This can happen if either the Y-SUS or Y-Drive boards are replaced or pulled off to perform checks.
SHUT DOWN AT TURN ON
Check
* V-Scan signal input to Lower Y-Drive board low ohms or low volts (Diode Mode).
* Output from any buffer shows low ohms or low volts (Diode Mode).
Defective Y-Drive Upper or Lower.  After determining which Y-Drive board is defective using the checks, the other board can be tested separately.
* If the Upper Y-Drive is found defective, the Lower Y-Drive board can be tested. 
  > Remove the Upper Y-Drive. Disconnect the Connector P209. 
  > Turn on the set and confirm that the bottom half of the picture looks normal.
* If the Lower Y-Drive is found defective, the Upper Y-Drive board can be tested.  
  > Remove the Lower Y-Drive. 
  > Disconnect the Connector P209.
* Jump either Pin 1 or 2 of P207 (V-Scan from the Y-SUS) to pin 4 or 5 of connector P108 on the Upper Y-Drive board.
* Turn on the set and confirm that the top half of the picture looks normal.
Click on the pictures to Magnify
Posted By: FRANK at 02:41
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