Panasonic S Series Technical Manual page 73

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Replace the
PSS board
Unplug connector P2 on the PSS board.
Measure the resistance between pin 1 of
connector P2 and ground (Chassis)
Is there a
Yes
short
circuit?
No
TC-P42S60:
Replace the SN board
TC-P50S60:
Replace the SC board
From previous
slide (A)
Shorted
Vsus
Slide 72