LG -A290 Service Manual page 68

TP is Short ?
TP3(Vbat) of U400
TP4~TP6 ?
Re-download SW and
Do calibration again
LGE Internal Use Only
START
TP1 &
Yes
Check
?
Yes
Check
Yes
Check
TP7 ?
Yes
No
No
No
Check Main Chip (MT653)
No
Check Main Chip (MT653)
TP4
MODE RF_VLOGIC
Stanby LOW
RX1 HIGH
RX HIGH
TX_LB HIGH
TX_HB HIGH
- 68 - Copyright © 01 LG Electronics. Inc. All right reserved.
4. TROUBLE SHOOTING
Replace Mobile SW
(SW100)
Replace U400
& circuit
TP5
RF_TX_EN
LOW
LOW
LOW
HIGH
HIGH
Only for training and service purposes
TP6
RF_BS
LOW
LOW
HIGH
LOW
HIGH