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1.2 No Picture
Check following steps.
No picture with all of
input sources
No
No picture with PC1[DVI
digital] input source
No
No picture with PC1 [DVI
analog] input source
No
No picture with PC2 [VGA
analog] 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 TPB1, TPB2, TPG1,
TPG2, TPR1, TPR2.
Check PSIG signals at test points TPPSIG and TPZPSIG.
Check power supply circuit 15.5V and peripheral circuit.
Check ICs IC501, IC531, IC561, IC2501, IC2531, IC401,
IC301 and peripheral circuits.
Yes
Check DVI interface stage;
Check IC201<A/D Conversion> and peripheral circuit.
Check DVI selection signals, PW_SCL1 and PW_SDA1.
Yes
Check PC source selecting stage;
Check IC3061<RGB buffer> and peripheral circuit on the DVI
board.
Check IC1201<PC1/PC2 RGB SW> and peripheral circuit.
PC1/PC2_SW5 signal (PC1: L) is output from pin 15 of
IC2323<D/A> and applied to pin 26 of IC1201 through
IC5371<Buffer>.
Yes
Check PC source selecting stage;
Check IC221<Sync sw> and peripheral circuit on the AV
board. Check MNTOUT_SW5 signal (PC2-Monitor-Out:H) is
output from pin 16 of IC2323<D/A> and applied to pin 1 of
IC201 and pins 9, 10, 11 of IC221 on the AV board through
IC5371<Buffer>.
Check IC1201<PC1/PC2 RGB SW> and IC5311<PC1/PC2
SYNC-SW> and peripheral circuit.
PC1/PC2_SW5 signal (PC1: L) is output from pin 15 of
IC2323<D/A> and applied to pin 26 of IC1201 through
IC5371<Buffer>.
Yes
Check PC/AV source selecting stage and processing stage;
Check IC5201<RGB/COMP-SW> and IC201<A/D
Conversion> and peripheral circuit.
PC/AV_SW5 signal (PC: H) is output from pin 13 of
IC2323<D/A> and applied to pins 10,11 of IC5301 through
IC5371<Buffer>.
COMPO5 signal (PC: H) is output from pin 14 of IC2323<D/A>
and applied to pin 26 of IC5201through IC5371<Buffer>.
4-3
Part 4: Troubleshooting
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