
3. TROUBLE SHOOTING
- 48 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
START
Check TP1/2
If GSM850/900 Over 31dBm?
If DCS/PCS Over 28dBm?
Check TP3/4
If GSM850/900 Over 7dBm?
If DCS/PCS Over 5dBm?
Check Transceiver physical damage
or soldering condition
Check component above RF signal path
Yes
No
Check next step
Check U1300 soldering
Yes
No
Replace U1500
NOT GOOD
OK?