LG D405 Service Manual page 72

3.8.3 WIFI/BT Signal Path Tx
Test point
TP1
TP2
TP3
TP4
LGE Internal Use Only
START
Check ANT5100
Yes
Check TP1,2,3,4
TP1 C5100 is 1.8v
TP2 C5101 is 1.8v
TP3 C5224 is 1.3v
TP4 R5105 is 3.3v
Yes
Check U5100
Net name
VREG_L6_1V8
VREG_L10_1V8
VREG_L24_1V3
VREG_L16_3V3
ANT5100 : Ant. Contact
U5100 : WCN3620
U4100 : PM8226
No
Remove the foreign substance
No
Power for WCN Digital I/O circuits
Power for XO circuitinput voltage.
Power for WCN analog, digital,and RF core circuits.
Power for WLAN driver amplifier circuits
Power for WLAN 2.4GHz PA circuits
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3. TROUBLE SHOOTING
inANT1103
Check U4100
Description
Only for training and service purposes