Samsung 172N Service Manual page 19

5 Troubleshooting
5-2 No Video
Check signal cable connection and power.
Do X1 and X2 oscillate properly?
1 2
Is there R, G, B input at BD9, BD10 and BD11?
Does sync appear at Pin 8 and 10 of IC8?
Are sync and data output
displayed on R192, R189, R198?
Does the output signal appear at R232, R241~R259?
There are DC 5V at Pin 1, 2 and 3 of CN3?
Replace LCD Panel.
5-2
Yes
Yes
Yes
3 4 5
Yes
Yes
Yes
No
Replace or
check related circuit.
No
Check input part.
No
Check IC8 and related circuit.
No
Check the power related to
IC7 and output part.
Check the panel_EN signal at
No
R204 and BL_EN signal at
R231 of related circuit.
No
Check the IC9
and related circuit.
NB17A*/NB19A*