No Bnc Video - Samsung 570DX Service Manual

4-4 No BNC Video

Does 3.3 V appear at
ZD109 ~ 113?
YES
Is the cable properly
connected?
YES
Does the wave form appear at
Pin 6 (H-sync)
And Pin 8 (V-sync)
IC103?
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
NO
9
of
10
NO
The scaler (IC408) is abnormal.
Press the power button and
check the LED.
Reconnect the BNC cable.
Replace IC103.
Replace the main board.
4 Troubleshooting
4-7