LG PF-43A10 Service Manual page 35

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5. NO SOUND (PICTURE OK)
Is the voltage of pin40
of IC15V(High)?
Yes
INT
Check Sound system
of MENU OSD
5.5/6.0/6.5
Is the SIF signal of
Pin22 of IC1T normal?
Yes
Are the Audio signal of
Pin28, 29 of IC1S normal?
Yes
Are the Audio signal of
Pin2, 5 of IC603 normal?
Yes
Are the Audio signal of
Pin7, 11 of IC603 normal?
Yes
Check/Replace
P604L, P604R, Speaker
Check switch
MSW601 position
4.5
Is the voltage of
Pin40 of IC1 0V(Low)?
Yes
Check/Replace
Check/Replace
X1S, IC5S, IC1S
Check/Replace
IC2S, IC3S, IC4S
Check the voltage
of Pin10 of IC603
- 35 -
EXT.
Set MSW601 to EXT
No
IC1T
No
No
No

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