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Troubleshooting
No Picture
Check following steps.
No picture with all of
input sources
No
No picture with PC1
[RGB] input source
No
No picture with PC2
[RGB] input source
No
No picture with all of
computer input sources
No
Go to next page
Yes
Check signal processing stage and LCD driving stage;
Check RGB S&H signals at test points TPVIDEOR, TPVIDEOG,
TPVIEOB.
Check power supply circuit 15.5V and peripheral circuit.
Check ICs IC501, IC531, IC561, IC3501, IC3531, IC401, IC301 and
peripheral circuits.
Yes
Check PC source input stage;
Check IC5201<PC1/PC2 RGB-SW> and peripheral circuit on the AV
board.
PC1/PC2_SW signal (PC1: L) is output from pin 19 of IC1804<Output
Expander> and applied to pin 26 of IC5201 through IC5371<Buffer>.
Yes
Check PC source input stage;
Check IC5201<PC1/PC2 RGB-SW> and peripheral circuit on the AV
board.
PC1/PC2_SW signal (PC2: H) is output from pin 19 of IC1804<Output
Expander> and applied to pin 26 of IC5201 through IC5371<Buffer>.
Check IC4011<Sync-sw> IC4071 and peripheral circuit.
Yes
Check PC/AV source selecting stage and processing stage;
Check IC5201<PC1/PC2 RGB-SW> and IC201<A/D Conversion> and
peripheral circuit.
PC1/PC2_SW signal (PC2: H) is output from pin 19 of IC1804<Output
Expander> and applied to pin 26 of IC5201 through IC5371<Buffer>.
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