LG -D175F Service Manual page 122

3.8.2 Speaker & Receiver Trouble Shooting
It's trouble shooting guide for no sound case.
Speaker & Receiver control signals are generate by MSM8210 (U2100)If low level volume or breaking the sound, change
speaker module
LGE Internal Use Only
Check the Speaker. And reassemble the speaker
module.
Yes
Hear the sound to the Speaker?
Change the speaker?
Check a main PCB.
L6700, L6701(TP1), R6700, R6701(TP2),
U6700(TP3) Speaker sound OK?
Change the main board
START
No
No
No
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3. TROUBLE SHOOTING
Yes
Yes
Only for training and service purposes