4. TROUBLE SHOOTING
- 46 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Check TP1 of SW300
TP1 Signal is OK?
Replace Mobile SW (SW101)
No
Yes
Mobile SW & PAM is OK.
Control Signal is TP4, TP7
(VLogic, BS) OK ?
Check Main Chip U100
No
Yes
TP2(High Band),
TP3(Low Band) Signal is OK ?
Replace U300
No
Yes
Check U300 ?
Yes
Mode
Input Control Bits
VSW_EN TxEN BS
STANDBY 0 0 0
Rx1
1
1 0 0
Rx2
2
1 0 1
Tx_LB 1 1 0
Tx_HB 1 1 1
Rx1 and Rx2 are broadband receive ports and each supports the GSM850, GSM900, DCS, and PCS bands.
EGSM Rx
To Next Page
Loading...
