Daewoo DLA-32C7LAB, Service Manual

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Hardware Troubleshooting : Digital Board
2) In spite of picture display, the sound is not generated.
START
1. Confrim AC connection
2. Confrim Power S/W on
3. Check Video or other PCBs
Check the connection of jack
Does screen appear?
Yes
No
Yes
Is the Sound input Jack
correctly connected?
No
Check the connection of speaker
Yes
Is the speaker correctly
connected?
No
Check the SMPS and input voltage
Yes
Check
the input power of IC702 is normal
(Pin 6, 7, 12, 13)
No
Check the path from IC702 to Speaker
No
Check
the signal output of IC702 is normal
(Pin 2,3,8,9,10,11,16,17)
Yes
Perhaps IC702 problem.
Replace main PCB
No
No
Check
the signal output of IC701 is normal
(Pin 34, 36)
Yes
Perhaps IC701 problem.
Replace main PCB
Digital TV mode : Check the path from IC701 to IC201
HDMI mode : Check the path from IC701 to IC501
Analog TV mode : Check the path from IC701 to TU101
Video, Component mode : Check the path from
each Pin of IC701 to each jack
Check
the input signal of IC701 is
normal
Yes