No Picture - Sanyo PLC-XW55A Service Manual

Troubleshooting

No Picture

check following steps.
No picture with all of in-
put sources
No
Yes
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TPB1, TPG1, TPR1.
Check power supply circuit 15.5V and peripheral circuit.
Check ICs IC501, IC531, IC561, IC401, IC301 and peripheral
circuits.
Check each signal input stage;
Computer source
Check RGB signals.
R signal is applied to pin 8 of IC301<System Control>, G sig-
nal is applied to pin 60 and B signal is applied to pin 58 of IC
301.
HV sync signals are applied to pins 331 and 161 of IC301<System
Control> as the HS and VS signals.
S-Video source
Check S-video signal (Y/C).
S_CHROMA signal is applied to pin 65 of IC301<System Con-
trol>, and S_Y signal is applied on pin 64 of IC301.
Component video source
The component signals are applied to pins 8, 58, 409 of
IC301<System Control>.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pin 6 of IC301<System
Control>.
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