LG -A270 Service Manual page 50

TP3(Low Band) Signal is OK ?
Control Signal is TP4, TP6,
TP7(VLogic,TXEN, BS)OK ?
TP8 signal same as TP1?
Mobile SW & PAM is OK.
EGSM Rx
Mode
STANDBY
Rx1
1
Rx

Tx_LB
Tx_HB
Rx1 and Rx are broadband receive ports and each supports the GSM850, GSM900, DCS, and PCS bands.
LGE Internal Use Only
Check TP& TP3
TP(High Band),
Yes
Yes
TP8 Signal is OK?
Yes
Yes
VSW_EN
0
1
1
1
1
No
Replace MT651 (U100)
No
Check MT651
No
Replace PAM (U300)
No
Replace SW300
Input Control Bits
TxEN
0
0
0
1
1
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4. TROUBLE SHOOTING
BS
0
0
1
0
1
Only for training and service purposes