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 !

Thursday 21 March 2019

LG 47LG90 - DIRECTVIEW LED LCD TV - DISASSEMBLY PROCEDURE

LG 47LG90 - DIRECTVIEW LED LCD TV - DISASSEMBLY PROCEDURE



DISASSEMBLE PROCEDURE -  REMOVING BACK COVER
POWER SUPPLY PWB REMOVAL
  • Remove the 4 screws indicated by the arrows and remove the shield.

  • Remove the two screws holding the Decorative plastic piece on the right side. Remove the plastic piece.
  • Remove the three pieces of tape on the left and topside that are shielding the cables as shown.
  • Remove the remaining 10 screws indicated by the arrows.
  • It is possible that your unit may have the Chocolate (Heat Transfer) material over the two large ICs. (See white squares) Maybe even behind the ICs. If so, pay attention to the location and return when reassembling.
MAIN PWB REMOVAL
  • Disconnect P1000, P1001, P800, P404 and P501.
  • Note: In the top right is a connector P200. This is an open connection.
  • Remove the 2 screws securing the Main PWB.
  • Note: The top 2 and bottom 2 screws were removed during the shield removal process.
  • NOTE: Look carefully on top and behind the BCM and Micronas Chip, look for a piece of Chocolate (Heat Transfer Material).  Be sure to transfer to new PWB if replaced.
T-CON PWB REMOVAL
  • Look for Chocolate (Rubber like) Heat transfer material under shield. Always put back is same location.
  • Warning: The Tape shown is Conductive.  Do not allow to touch electrically charged components.
UNLOCKING CN-1, CN-2, CN-4 & CN-5.
  • To remove the flex cables to the TFT Panel, CN4 or CN5: Place a soft sharp object like a fingernail underneath the black locking tab and gently lift upward.
  • Flip the lock up and back from the flex cable.   Then the flex cable can be easily removed.
  • Use your fingernail to release locks to avoid damage to locking mechanism.

  • To remove the LVDS cables for CN1 or CN2; Press in on the two tabs and slowly rock the cable out of the connector.
T-CON CN-8 OR CN-9 UNLOCKING
INVERTERS "M" & "S" PWB REMOVAL [REMOVE THE SHIELDS FIRST]
INVERTERS - BACK-LIGHT LED DRIVER PWBs REMOVAL