Power On Trouble - LG G3100 Service Manual

4.4 Power On Trouble

SETTING : Connect PIF, and set remote switch off at PIF.
Check Battery Voltage
Push power-on key
and check the level change
Check the voltage of
the following pins at U301
Pin 21 = 2.8V ?
Pin 22 = 2.45V ?
Pin 25 = 2.7V ?
Pin 6 = 2.45V ?
Logic level at pin 1 of U301
THE PHONE WILL
START
> 3.35V ?
Yes
of U301 Pin 2
Yes
Yes
= HIGH?
Yes
POWER ON.
No
Charge or Change Battery
No
Check the contact of power-key
or dome switch.
No
Replace U301
No
Redownload software
- 77 -
4. TROUBLE SHOOTING