Trouble Shooting; Power On Trouble - LG GB175 Service Manual

4. Trouble Shooting

4.1 Power On Trouble

4.1.1 Test Point
Check Points :
Battery Voltage(Need to over 3.31V)
‐
Power-On key detection(PWRON signal)
‐
Outputs of LDOs by U502
‐
Name Output
Vcore 1.8V
VDD 2.8V
AVDD 2.8V
VMEM 1.8V
VSIM 1.8V / 3V TP5
VRTC 1.5V
VUSB 3.3V
VIB 3.2V
PCB Placement
TP5
TP6
TP8
TP2
TP Component
TP1 C504 & C505 Power on check
TP2 C513
TP3 C514
TP4 C516
C517
TP6 C518
TP7 C519
TP8 C520
Describe
Power on check
Power on check
Power on check
No detect SIM check point
Power on check
USB fail check point
Vibrator fail check point
-43-
TP3
TP1
TP4
TP7