Panasonic GP6DU Technical Manual page 39

How to troubleshoot a "no power condition for the TH-42PD25U
Does the voltage at pin 2 of P27 go high when power is
turned on?
Yes
The P board is Is the voltage high at pin 9 of PF10
possibly defective
Is there 10V on pin 1, and 24V
on pin 5 of connector PF10 on
the PF board?
Yes
3 7 11
5V 5V 5V
Can you confirm these voltages at connector
PA12 on the PA board?
Yes
Check the D and the
DG boards
Is the power LED red at power up?
Yes
No
on the PF board?
Yes No
The D or the DG
board may be
defective
17 21 25
10V 9V 2.5V
No
Check The PA board
Is 5V present on pin 4 of connector P27 on
Yes
Check the K and
PA boards
No
The PF
board
may be
the
problem
Table 2
33
No
the P board?
No
Is there AC going in to
pins 1 and 4 of
connector P9 on the P
board?
Yes No
If fuses
Replace on the PF
the P are ok,
board the PF
board