LGE Internal Use Only
3. TROUBLE SHOOTING
3.9 Checking Audio Block
Circuit Diagram
Image
Checking Flow
3.9.1 Audio speaker
The Speaker control signals are generated by PMU chip MT6328(U401), the PMU chip and the speaker are to be checked out.
Start
Check TP1
~TP4
Check SPK
Re-solder or change
R318(TP3) R319(TP4)
Change Speaker
Speaker function ok
Check PMU
(U2001)
Change PMU(U2001)
No
Yes
No
Yes
No
Yes
TP2
TP1
TP3
TP4
TP4
TP3
TP2
TP1
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2017 LG Electronics. Inc. All right rese
rved. Only training and service purposes
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