No Dvi Video - Samsung 570DX Service Manual

4-3 No DVI Video

Does the LED light up when
turn on the power?
YES
Does 5 V appear at Pin 14 and
16 of CN101 DVI port?
YES
Does the wave form as the figure
appear at R161(DVI_SCL)
and R162(DVI_SDA)
YES
Does the signal appear at
RA107(R), RA102(G), and
RA105(B)?
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
Check the cable connection.
NO
7
?
8
NO
IC105 is abnormal. Replace the
NO
The Scaler (IC408) is abnormal.
Check the power port.
Replace the main board.
main board.
Replace the main board.
4 Troubleshooting
4-5