SERVICE MANUAL LC-XB41 - TechEdu.com
SERVICE MANUAL LC-XB41 - TechEdu.com
SERVICE MANUAL LC-XB41 - TechEdu.com
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Troubleshooting<br />
No Picture<br />
Check following steps.<br />
No picture with all of<br />
input sources<br />
No<br />
Yes<br />
Check signal processing stage and <strong>LC</strong>D driving stage;<br />
Check RGB S&H signals at test points TP35B, TP35G, TP35R1.<br />
Check power supply circuit 15.5V and peripheral circuit.<br />
Check ICs IC501, IC531, IC561, IC2501, IC2531, IC2561, IC401,<br />
IC301 and peripheral circuits.<br />
No picture with PC1<br />
[Analog] input source<br />
only<br />
No<br />
Yes<br />
Check PC1/PC2-switching stage;<br />
Check IC5201 and peripheral circuit.<br />
PC1/PC2_SW signal (PC2: H) is output from pin 348 of<br />
IC301 and applied to pin 26 of IC5201.<br />
PC1:L, PC2:H<br />
No picture with PC2<br />
[Analog] input source<br />
only<br />
No<br />
Yes<br />
Check PC1/PC2-switching stage;<br />
Check IC5201 and peripheral circuit.<br />
PC1/PC2_SW signal (PC2: H) is output from pin 348 of<br />
IC301 and applied to pin 26 of IC5201.<br />
PC1:L, PC2:H<br />
No picture with all of<br />
<strong>com</strong>puter input sources<br />
No<br />
Yes<br />
Check PC/AV source selecting stage and processing stage;<br />
Check IC5201 and IC301 and peripheral<br />
circuit.<br />
No picture with video<br />
input sources<br />
Check AV source selecting and decoding stage;<br />
S-Video source<br />
Check S-video signal (Y/C).<br />
S-C signal is applied to pin 265 of IC301, and S-Y signal is<br />
applied on pin 264 of IC301.<br />
S_SW signal (S-VIDEO:L) is input to pin 267 of IC301.<br />
Component video source<br />
Check <strong>com</strong>ponent signal (Y/Cr,Pr/Cb,Pb).<br />
The <strong>com</strong>ponent signals are applied to pins 410, 408, 411 of IC301<br />
.<br />
Composite video source<br />
Check <strong>com</strong>posite video signal (Video).<br />
The <strong>com</strong>posite video signal is applied to pins 262 of IC301 .<br />
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