LG DU-42LZ30 Service Manual page 15
42" lcd tv - integrated hdtv and pc monitor
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Also See for DU-42LZ30:
- Owner's manual (49 pages) ,
- Specifications (2 pages) ,
- Owner's manual (48 pages)
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No Sound
Check
sound supply:
18V at A_board P821
pin no. 3
Pass
Check
output to the speaker:
Does P601 no. 1
waveform exist?
Pass
Replace Speaker
Measure
A_power board trans
output:
4V at D_power_board P815
Fail
pin no. 4
Check
if A_board 18V is short-
circuited:
Resistance between A_board
P821 pin no.
2 and 3 infinity?
Replace A_board
NO
- 15 -
Fail
Pass
Fail
Replace
D_power_board
Replace A_board
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