Specification - Panasonic TH-43DX400L Service Manual

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Remove screws from the red circle position and remove the back cover,
3. remove 3in1 PCB
Pull out the socket connection in red block and remove screws in red circle. Take
out the PCB.
4. remove IR/Key PCB
Tear up the downside back cabinet and you can find IR and key pad on the cover.
There is no screw on the IR board, untie the hook structure and take out the PCB.
Remove
the key pad.

Specification

Brief look on the model