1. Can not power on
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LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
6. Repairing
MAIN BOARD SECTION
6.2 TROUBLE SHOOTING
Check VBAT to GND
Replace battery, connector,
have problem
YES
Check Vcore, AVDD,VMEM, U502 is damage
PMIC_VCTXO and VDD
YES
Check the TP502 is 4V or not
NO
Relpace keypad brard
YES
Check the X401 is 32.768 KHz
U401 is damage
Re-download S/W
Vcore
C508
1.8V
AVDD
C510
2.8V
VMEM
C512 2.8V
PMIC_VCTXO C511 2.8V
VDD C509
2.8V
X401: 32KHz