LG LG-K430DSF - Page 17

17
Copyright ⓒ 2016 LG Electronics. Inc. All right
reserved. Only training and service purposes
http://eduwebcell.blogspot.com/
3. TROUBLE SHOOTING
3.4 ASM(Antenna Switch Module) Block
3.4.2 Checking ANT #2 ASM (GSM 1800/1900, W B1 B2, LTE B3)
Image
Checking Flow
Circuit Diagram
TP1
TP2
U1001
TP2
TP1
TP2
TP1
START
Check TP1, TP2 High Level ?
(2.5V≤TP1 ≤3.1V)
(1.7V≤TP2 ≤1.9V)
NO
The Problem may be
Logic part
Refer to Logic trouble
shoot
YES
NOT GOOD
Check U1001 physical Damage
or soldering condition
Replace U1001
OK?
Check Next step