Hardware Troubleshooting : Digital Board - Daewoo LCD TV Service Manual

6. Hardware Troubleshooting : Digital Board

1) In spite of sound output, the screen is black.
1.1 In case of ATV, DTV, VIDEO and COMPONENT mode.
START
the input power of
IC501 is correct
the LVDS signal output of IC501 is correct
(Pin A14, B14, A15, B15, A16, B16, A17,
B17, A18, B18, A19, B19)
Is the input signal of IC501 normal?
1) TV mode : Check the path from Pin 8 of TU101 to Pin Y4
of IC501
2) Component mode : Check the path from input jack to Pin
V6, W9, Y8(Comp 1) and W6, Y9, W8(Comp 2) of IC501
3) Video mode : Check the path from input jack to Pin
Y10(Video 1) and V8(Video 2) of IC201
Check
Yes
Check
No
No
Replace the Main PCB
No
Check the SMPS
and input voltage
Yes
the LVDS connector and cable
is correct
Yes
IC501 Problem.
Replace the Main PCB
IC501 Problem.
-14-
Check
Yes
Perhaps Connector and Cable
Replace the Main PCB
No
Problem.