LG 42LH90 LED LCD TV - HOW TO REMOVE THE MAIN BOARD AND THE INVERTER BOARD & MAIN POWER SUPPLY BOARD

MAIN BOARD REMOVAL

• Disconnect P3500, P3501, P3502, P1200, P700 and P600.
• Remove any tape holding down any cables.  Remove the 6 screws indicated by the arrows.
• Remove decorative plastic and remove the board.

NOTE: Always check on top and behind the Large ICs. And look for a piece of Chocolate (Heat Transfer Material).  Be sure to transfer to new Board if present.

REMOVING THE INVERTER BOARD

• Remove the 8 screws indicated by the arrows.   Remove the Inverter Shield.
• Disconnect CN1, CN3, CN4 and CN306.  Remove the Inverter.

NOTE: Always check for Chocolate (Heat Transfer Material).  Be sure to transfer to new Board if present and replace in the correct position. There should be 8 pieces on the DC to DC converter coils near the bottom right.  If Servicing the Board, return the screws into the board to provide stability and grounding.

Removing the Inverter Board (Chocolate Notice) Back Side of the board.

• On the backside of the Inverter are 5 pieces of Chocolate, (Heat Transfer and Noise reduction pads). Be sure to replace these on the New Inverter if the board is replaced.  Be sure they don’t fall off if the Inverter is removed.

REMOVING MAIN POWER SUPPLY BOARD

• Disconnect P201, P203, AC In SK100 and SK101.
• Remove the 6 screws indicated by the arrows.

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