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