3. TROUBLE SHOOTING
- 101 -
Copyright © 2014 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
R4104
10K
R4105
0
CBL_PWR_N
KPD_PWR_N
OPT_2
OPT_1
PS_HOLD
RESIN_IN
PON_RESET_N
77
101
100
119
108
102
85
MSM_RESIN_N
MSM_PS_HOLD
PM_KYPD_PWR_N
JTAG_PS_HOLD
R103
100
D105
D103
CN100
6
5
4
3
2
1
100
R101
R102
100
D104
KEYPAD_SENSE_0
KEYPAD_SENSE_2
PM_KYPD_PWR_N
R4104
10K
R4105
0
CBL_PWR_N
KPD_PWR_N
OPT_2
OPT_1
PS_HOLD
RESIN_IN
PON_RESET_N
77
101
100
119
108
102
85
MSM_RESIN_N
MSM_PS_HOLD
PM_KYPD_PWR_N
JTAG_PS_HOLD
R103
100
D105
D103
CN100
6
5
4
3
2
1
100
R101
R102
100
D104
KEYPAD_SENSE_0
KEYPAD_SENSE_2
PM_KYPD_PWR_N
-KPD_PWR_N
Check the signal change from high to low
when push the PWR key. (R4105)
- PS_HOLD check : R4104
It should be high when power on
CN100(2,3 pin -> power key)
4. 10. Power
-KPD_PWR_N
Check the signal change from high to low
when push the PWR key. (R4105)
CN100(2,3 pin -> power key)
2
3
- PS_HOLD check : R4104
It should be high when power on
- 96 -
R4104
10K
R4105
0
CBL_PWR_N
KPD_PWR_N
OPT_2
OPT_1
PS_HOLD
RESIN_IN
PON_RESET_N
77
101
100
119
108
102
85
MSM_RESIN_N
MSM_PS_HOLD
PM_KYPD_PWR_N
JTAG_PS_HOLD
R103
100
D105
D103
CN100
6
5
4
3
2
1
100
R101
R102
100
D104
KEYPAD_SENSE_0
KEYPAD_SENSE_2
PM_KYPD_PWR_N