NEC PlasmaSync PX-42VM1G, Service Manual

Page: 65 / 172

4-2
TROUBLESHOOTING
Fault in the digital signal processor system
Fault in the digital signal processor system
Is the input any of the VIDEO, DVD, RGB VIDEO inputs?
YES NO
Are there normal 3Vp-p pulse YES YES Are pulses of 3Vp-p (video signal) normally
outputs (video signal) available at generated at Pins 70 to 98 (except for VDD
Pins 122 to 159 (except for the and VSS) of IC7506?
VDD, GND, and JL connector
terminals) of IC8501?
NO NO
Fault in peripheral circuits of IC9004
Are pulses of 3Vp-p (video signal) Are pulses of 3Vp-p (video signal) normally
normally generated at Pins 80 to generated at Pins 1 to 36 (except for VCC, GND,
98 (except for VDD and VSS) of CE, and MSEL) of IC7503?
IC7506?
NO YES YES NO
Fault in peripheral circuits of IC8501 Fault in peripheral circuits of IC7506
Are pulses of 3Vp-p (video signal) Are pulses of 3Vp-p (video signal) normally
normally generated at Pins 1 to 24 generated at Pins 122 to 159 (except for the VDD,
(except for VCC, GND, and CE) GND, and JL connector terminals) of IC8501?
of IC7503?
NO YES YES NO
Fault in peripheral circuits of IC7506 Fault in peripheral circuits of IC7503
Are pulses of 3Vp-p (video signal) normally
generated at Pins 91 to 150 (except for VDD
and GND) of IC8701?
YES NO
Fault in peripheral circuits of IC7503
Are pulses of 3Vp-p (video signal) Are pulses of 3Vp-p (video signal) normally
normally generated at Pins 45 to generated at Pins 45 to 122 (except for VDD,
122 (except for VDD, GND, VO, GND, VO, DE, and HO) of IC6502?
DE, and HO) of IC6502?
NO YES YES
Fault in peripheral circuits of IC7503 Fault in peripheral circuits of IC8701
Fault in peripheral circuits of IC8701
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