LG 22LU7000 Service Manual page 26

(3) In case of no sound to Headphone
All input mode
is no sound ?
Yes
Is VCC 3V3 normal?
Yes
U112 operate
normal?
Yes
U764 operate
normal?
Yes
Is sound output of the
JP762 normal?
Replace MainBoard
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Only for training and service purposes
No
Same as Block B
No
Replace U45(LD1117)
No
Replace U112(FLI10610H)
No
Replace U764(TPA6110)
Replace JP762
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LGE Internal Use Only