LGE Internal Use Only
3. TROUBLE SHOOTING
Circuit Diagram
Image
3.9.2 Audio_Main MIC
The MIC control signals are generated by PMU chip MT6328(U401), the PMU chip and the MIC are to be checked out.
Checking Flow
Start
Check TP1
~TP4
Check
soldering
Re-solder or change
C742, C743, C715,
C716, C717
Change U702
MIC function ok
Check PMU
(U401)
Change PMU(U401)
No
Yes
No
Yes
No
Yes
3.9 Checking Audio Block
TP4
TP3
TP1
TP2
TP1
TP2
TP4
TP3
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2017 LG Electronics. Inc. All right rese
rved. Only training and service purposes
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