LG M6100 Service Manual - Page 89

TEST POINT, Checking Flow, CIRCUIT

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4. TROUBLE SHOOTING TEST POINT CIRCUIT VBAT 47 47 47 47 C101 1u C102 1u C103 1u C104 1u C105 1u C106 1u SSC-TWH104-HL R102 SSC-TWH104-HL R101 47 LD105 LD106 LD104 SSC-TWH104-HLR106 LD103 SSC-TWH104-HLR105 LD102 SSC-TWH104-HLR104 SSC-TWH104-HL R103 47 LD101 Figure 4-12 KEY_BACKLIGHT R109 12K R110 12K C108 27p 3 2 Q101 2SC5585 1 R111 10 R112 10 Upper PCB Checking Flow START Is the voltage level VBAT 3.6-4.2V? Yes Are all LEDs LD100~LD105 working? Yes Q100 is working? Yes BACKLIGHT WILL WORK PROPERLY. No Charge battery No Check the soldering of each R or replace LEDs not working. No Check the condition of Q100. If problem, Change Q100 - 90 -

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4. TROUBLE SHOOTING
- 90 -
C108
27p
10
R112
R111
R110
10
12K
47
VBAT
R109
12K
R104
R103
47
LD101
SSC-TWH104-HL
SSC-TWH104-HL
LD102
C102
1u
1u
C101
47
R106
47
LD103
SSC-TWH104-HL
R105
SSC-TWH104-HL
LD104
1u
C104
C103
1u
Q101
2SC5585
2
3
1
C105
C106
1u
1u
47
R102
R101
47
LD105
SSC-TWH104-HL
SSC-TWH104-HL
LD106
KEY_BACKLIGHT
BACKLIGHT WILL
WORK PROPERLY.
START
Is the voltage level VBAT
3.6-4.2V?
No
Are all LEDs LD100~LD105
working?
No
Check the soldering of each R or replace LEDs not working.
Yes
Charge battery
No
Check the condition of Q100. If problem, Change Q100
Yes
Q100 is working?
Yes
TEST POINT
Checking Flow
CIRCUIT
Figure 4-12
Upper PCB