LG GT500 - Wi-Fi Trouble

- 114 -
LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
4. TROUBLE SHOOTING
4.12 Wi-Fi Trouble
Wi-Fi module (M710) gets power from 2 LDOs (U710, U711) and clock from oscillator inside the module.
RF path is shared with Bluetooth RF.
4.12.1 Wi-Fi Power path
TP2
TP1
Sub PCB
TP3
start
1. Check VBAT
TP1: VBAT
2. Check 1.8V LDO
TP2: 1.8V
Change Sub
PCB
No
Yes
Replace U710
No
Yes
3. Check 3.3V LDO
TP3: 3.3V
Replace U711
No
Yes
Go Next Step
POWER
VDD_WLAN_3V3
R717
0
0
R716
C722
3
CE
2
GND
5
PGND
VDD
41
VOUT
1u
RP101K182D U711
VDD_WLAN_1V8
VBAT
3
CE
2
GND
5
PGND
VDD
41
VOUT
RP101K332D U710
C721
1u
C723
1uC724
1u
ACC_GP_WLAN_EN
TP3
TP2
TP1