LG LG-K430DSF - Page 16

16
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3. TROUBLE SHOOTING
3.4 ASM(Antenna Switch Module) Block
3.4.1 Checking ANT #1 ASM (GSM 850/900, W B5/8, LTE B7/20)
Checking Flow
Image
Circuit Diagram
TP1
TP2
TP1
TP2
Main
Top
U1002
TP1
TP2
START
Check TP1, TP2 High Level ?
(2.5V≤TP1 ≤3.1V)
(3.9V≤TP2 ≤4.2V)
NO
The Problem may be
Logic part
Refer to Logic trouble
shoot
YES
NOT GOOD
Check U1002 physical Damage
or soldering condition
Replace U1002
OK?
Check Next step