Panasonic TC-P42X1, TC-P42S1, TC-P50S1, TC-P46S1 SU and SD Boards Isolation Procedure, Slide #63

Models: TC-P42X1 TC-P46S1 TC-P50S1 TC-P42S1 TC-P50X1

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SU and SD Boards Isolation Procedure

SU and SD Boards Isolation Procedure

Beginning last year (2008), the new plasma models are now designed not to turn- on if either the SU or SD board is disconnected.

Disconnecting either causes the unit to shutdown and the power LED to blink 7 times.

Unplugging any of the connectors SC41/SU41, SU11/SD11, and

SC42/SD42, opens the interlocked connection between VF_GND and CHA on the SC board. This floats point “CHA” and Q16471 turns on. IC16561 outputs a high to pin 21 of connector SC20 triggering shutdown.

To isolate the SU and SD boards at the same time is not necessary to remove the boards:

Remove the 4 VF_GND screws (2 on the SU board and 2 on the SD board).

Unplug connectors SC41, SC46, and SC42 on the SC board.

Place a jumper between pins 1 and 2 of the empty connector SC50.

When this is done, the display is completely black (No picture)

Note: This procedure could be useful when troubleshooting 7 blinks problems.

Slide #63

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Panasonic TC-P42X1, TC-P42S1, TC-P50S1, TC-P46S1, TC-P50X1 manual SU and SD Boards Isolation Procedure, Slide #63