NEC PlasmaSync PX-42VM1G, Service Manual

Page: 66 / 172

4-3
TROUBLESHOOTING
Errors in the sync system
NO
Is a clock signal present at Pin 49 of the Fault in the AD connector block or peripheral circuits of X9001
AD connector?
YES
NO
Are signals of 3Vp-p present at Pins 51 Fault in the AD connector block or peripheral circuits of IC9004
(HSYNC) and 53 (VSYNC) of the AD
connector?
YES
NO
Are signals of 5Vp-p present at Pins Fault in the AD connector block or peripheral circuits of IC9501
77, 78, and 79 of the AD connector?
YES
NO
Are signals of 3Vp-p present at Pins Fault in the IC8501 block or peripheral circuits of IC9004
115 (HSYNC) and 116 (VSYNC) of
IC8501?
YES
Are signals of 3Vp-p present at Pins 39
and 213, 42 and 212 (VSYNC), and 215
(CLOCK) of the AD connector?
NO YES
YES
Is normal display available after the replacement of the AD cable defective
of the AD cable?
NO
YES
Is normal display available after the replacement of the Fault in the MAIN PWB
MAIN PWB?
NO
YES
Is normal display available after the replacement of the Fault in the MAIN PWB
VIDEO PWB?
NO
Fault in plasma display module
YES
Are horizontal and vertical sync signals Are horizontal and vertical sync signals of 5Vp-p present at Pins 7
of 5Vp-p present at Pins 9 and 10 of the and 8 of the MN connector?
MN connector?
NO YES NO YES
Is normal operation accomplished after MN cable defective Is discrimination of the Fault in peripheral
the replacement of the MN cable? PC mode finished? circuits of IC9501
NO NO
YES
Fault in peripheral circuits of IC6502 or IC7503
YES
Is normal operation accomplished after HD cable defective
the replacement of the HD cable?
NO
YES
Is normal operation accomplished after VIDEO PWB defective
the replacement of the VIDEO PWB?
NO
Fault in the MAIN PWB
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