Power On Troubleshooting - LG -D618 Service Manual

3.16 Power ON Troubleshooting

The main power source of LGD618 is provided by 1 chip which is PM8226. Since MSM8226 only powers up normally
when MSM8226 is properly powered therefore, PM8226 is the actual one to take look at.
Power ON sequence of LGD618 is,
PWR key press -> BAT_FET_N goes low -> GPIO8 High -> VREG_S3 High -> VREG_L6 High -> VREG_L12 High -> BB_CLK ->
PON_RESET_N goes high -> PS_HOLD High.
CN10000
1
2
3
4
D10004
6.3V 6.3V
LGE Internal Use Only
TP1(R10002)
R10002
100
1
D10005 D10003
1 1
2
2 2
R10001
100
PM_KYPD_PWR_N
R10003
100
TP4(C4139)
- 111 - Copyright © 2014 LG Electronics. Inc. All right reserved.
3. TROUBLE SHOOTING
KEYPAD_SENSE_0
KEYPAD_SENSE_2
VREG_S1_1P15
VREG_S2_1P15
VREG_S3_1P35
VREG_S4_2P1
Only for training and service purposes