Samsung 570DX Service Manual page 113

4-6 No AV Video
Does the LED light up when
turn on the power?
YES
Does the waveform at L101
YES
Does the TX** signal appear
at Pin 14 and 15
of CN403?
YES
Check the cable between the
main board and panel and
replace the LCD panel.
NO
NO
?
14
NO
The scaler (IC408) is abnormal.
Replace the main board.
Check the power port.
Reconnect the cable.
4 Troubleshooting
4-11