Wednesday, March 27, 2013

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