Daewoo LCD TV - Hardware Troubleshooting: Digital Board; Troubleshooting Black Screen Issues

6. Hardware Troubleshooting : Digital Board
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1) In spite of sound output, the screen is black.
1.1 In case of ATV, DTV, VIDEO and COMPONENT mode.
START
Check the SMPS
and input voltage
IC501 Problem.
Replace the Main PCB
IC501 Problem.
Replace the Main PCB
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
Perhaps Connector and Cable
Problem.
Replace the Main PCB
Check
the input power of
IC501 is correct
Yes
No
Check
the LVDS connector and cable
is correct
Is the input signal of IC501 normal?
Check
the LVDS signal output of IC501 is correct
(Pin A14, B14, A15, B15, A16, B16, A17,
B17, A18, B18, A19, B19)
No
Yes
No
Yes
No
Yes