NEC PlasmaSync PX-42VM1G Service Manual page 72

TROUBLESHOOTING
2. No presentation of PC pictures
The RGB signal is present at
Pins 1, 3, and 5 of the POMN
connector.
NO
The RGB signal is present at
TP5610 to 5612.
NO
Fault in peripheral circuits of
IC5612 to IC5617
4-9
YES
The H/V sync signal is present
at Pins 7, 8, 9, and 10 of the
POMN connector.
The H/V sync signal is present
at Pins 2 and 5 of IC5803.
YES
Fault in peripheral circuits of IC5620
YES
NO
YES
NO
Fault in the MAIN PWB
Fault in IC5803/IC5804
Fault in peripheral circuits
of IC5810