No Picture - Eiki LC-WB200 Service Manual

Troubleshooting

No Picture

Check following steps.
No picture with all of
input sources
No
No picture with PC1
input source only
No
No picture with PC2
input source only
No
No picture with all of
computer input sources
No
No picture with video
input sources
No
No picture with HDMI
input sources
Yes
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TP35B, TP35G, TP35R.
Check power supply circuit 15.5V_PNL and peripheral circuit.
Check ICs IC501, IC531, IC561, IC401, IC301 and peripheral
circuits.
Yes
Check IC301<Scaler>, IC01<A/D>, IC5301<HV Sync SW> and
peripheral circuit.
R1, G1, B1 signals are applied at pins 7, 1, 19, and HS1, VS1
signals are applied at pins 33, 44 of IC01<A/D>
R1, G1, B1 signals are applied at pins 14, 106, 15 and HS1,
VS1 signals are applied at pins 98, 399 of IC301.
Check IC301<Scaler>, IC01<A/D>, IC5301<HV Sync SW> and
Yes
peripheral circuit.
R, G, B signals are applied at pins , 4, 8, and HS, VS
signals are applied at pins 34, 45 of IC01<A/D>
R, G, B signals are applied at pins 101, 103, 1 and HS,
VS signals are applied at pins 400, 97 of IC301.
Yes
Check PC/AV source selecting stage and processing stage;
Check IC301<Scaler> and peripheral circuit.
Check AV source selecting and decoding stage;
Yes
S-Video source
Check S-video signal (Y/C).
S_CHROMA signal is applied to pin 108 of IC301<Scaler>,
and S-Y signal is applied on pin 318 of IC301.
Composite video source
Check composite video signal (Video).
The composite video signal is applied to pins 109 of IC301
<Scaler>.
Check IC8001 <HDMI driver> , IC301<Scaler> and the peripheral cir-
cuits.
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