LG GM200 Service Manual page 107
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4. TROUBLE SHOOTING
B12
TDI
A9
TCK
K22
POWERKEY
KEYON
L20
KEY_ROW4
KEYOUT
F18
LIGHT1
G17
KEY_BACKLIGHT2
LIGHT2
G18
KEY_BACKLIGHT3
LIGHT3
T20
UCLK
P18
USB_N
USB_DM
N18
USB_P
USB_DP
M13
USB_ID
R18
WUDQ
R19
WUDI
T18
WDDQ
T19
WDDI
CHECKING FLOW
START
Power save mode?
YES
Is the Duty cycle of LED
(60%)?
YES
Are all LEDs
Working?
YES
LGE Internal Use Only
LGE Internal Use Only
K
E
Y
_
R
O
W
0
K
E
Y
_
R
O
W
1
K
E
Y
_
R
O
W
2
U103
K
E
Y
_
R
O
W
3
K
E
Y
_
R
O
W
4
K
E
Y
_
R
O
W
5
NO
300us
500us
NO
Resolder U103
NO
Replace or resolder
component
Backlight will work properly.
- 108 -
M
A
N I
T
O
K
E
Y
B
o t
B
V
B
A
T
C
N
3
0
1
1
2
0
2
1
9
3
1
8
4
1
7
5
1
6
6
1
5
7
1
4
8
1
3
9
1
2
1
0
1
1
E
N
B
Y
0
0
1
9
5
0
1
A
X
K
7
2
0
1
4
7
G
D
3
0
3
P
R
S
B
6
8 .
C
Are all LEDs
not Working?
NO
YES
Check the soldering
each R and LED
NO
Copyright © 2009 LG Electronics. Inc. All right reserved.
K
E
Y
_
C
O
L
0
K
E
Y
_
C
O
L
1
K
E
Y
_
C
O
L
2
K
E
Y
_
C
O
L
3
K
E
Y
_
C
O
L
4
P
O
W
E
R
K
E
Y
K
E
Y
_
B
A
C
K
I L
G
H
T
3
K
E
Y
_
B
A
C
K
I L
G
H
T
2
D
3
0
5
D
N
_ I
I D
O
D
E
_
1
0
0
6
YES
If on, R121,R122,R123,R124
R125,R126,R127,R128 =0~500mV?
YES
NO
Resolder U103,CN301,CN103
Only for training and service purposes
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