Hardware Troubleshooting : Digital Board - Daewoo DLA-32C7LAB 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
Check
the input power of
IC501 is correct
Check
the LVDS signal output of IC501 is correct
(Use RC450~RC459)
Is the input signal of IC501 normal?
1) TV mode : Check the path from Pin 9 of TU101 to Pin J1 of IC501
2) Component mode : Check the path from input jack to Pin U2,U3
,V2(COMP1) and R1,R2,T1(COMP2) of IC501
3) Video mode : Check the path from input jack to Pin M3(Video1)
and L3(Video2) of IC501
No
Yes
No
Yes
No
IC501 Problem.
Replace the Main PCB
Check the SMPS
and input voltage
Yes
Check
the LVDS connector and cable
is correct
Yes
IC501 Problem.
Replace the Main PCB
-13-
No
Perhaps Connector and Cable
Problem.
Replace the Main PCB