No Video (Analog) - Samsung 740NW Service Manual

4-2 No Video
Check the signal cable and its
connections.
1
Does X300 oscillate
8
correctly?
Yes
Do the R, G, B inputs
appear on R134,
R135, and R138?
10
Yes
Do the Hsync and Vsync
waveforms appear on pins 89 and
3
13 90 of IC300?
Yes
Do output signals appear on pins
2 to 31 and 37 to 40 of CN601?
14
15
Yes
IS DC 5V measured at pins
42, 43, 44 of CN601?
16
Yes
Check the panel and replace it if
necessary.
* All locations of this page includes Main PBA.
No
No
9
11
No
Check IC300 and its related circuits.
2
12
No
Check IC601 and its related circuits.
No
Check the panel EN signal at R307
Check and replace the related
circuits.
Check the input part.
and the BL_EL signal at R316.
4 Troubleshooting
4-3