No Pc(D-Sub) Video - Samsung 570DX Service Manual

4-2 No PC(D-SUB) Video

Does the LED light up when
turn on the power?
YES
Does 5V appear at Pin 9 of
CN101 D-Sub?
YES
Does the waveform as the
figure at Pin 6 ( H-sync)
and Pin 8 (V-sync)
appear?
YES
Is TX** signal sent to Pin 14
and 15 of CN403 14, 15?
YES
Check the cable between the
main board and panel and
replace the LCD panel.
NO
NO
NO
5
of IC103
6
NO
Check the power port.
Check the cable connection.
Replace IC103.
The Scaler(IC408) is abnormal.
Replace the main board.
4 Troubleshooting
4-3