LG KU580 Service Manual - Page 77
Trouble Shooting
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4. TROUBLE SHOOTING 4. TROUBLE SHOOTING 4.1 Power ON Trouble START The voltage of main battery is higher than 3.2V ? Yes END key operates well? ONSWBn(TP412) level is low when END key pressed. Yes No change main battery No Follow the keypad Trouble shooting guide Check the voltage. VDD_A (R605) 2.75V VDD_C (R608) 2.75V VDD_D (C602) 1.5V VDD_E(R606) 1.8V VDD_F (C609) 2. 5V VDD_G (TP600) 2.85V VDD_H (C608) 1.5V VDD_K(C611) 2.75V VDD_LP(R609) 1.5V SWBUCK(L600) 1.2V ONSWBn(TP412) < Main Board - Bottom side > No Change main board LGE Internal Use Only - 78 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes
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- 78 -
4. TROUBLE SHOOTING
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc.
All right reserved.
Only for training and service purposes
4.1 Power ON Trouble
4. TROUBLE SHOOTING
START
No
Change main board
change
main battery
Yes
Yes
No
No
The voltage of main battery
is higher than 3.2V ?
END key operates well?
ONSWBn(TP412) level is low
when END key pressed.
Follow the
keypad Trouble
shooting guide
Check the voltage.
VDD_A (R605) 2.75V
VDD_C (R608) 2.75V
VDD_D (C602) 1.5V
VDD_E(R606) 1.8V
VDD_F (C609) 2. 5V
VDD_G (TP600) 2.85V
VDD_H (C608) 1.5V
VDD_K(C611) 2.75V
VDD_LP(R609) 1.5V
SWBUCK(L600) 1.2V
< Main Board - Bottom side >
ONSWBn(TP412)