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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
5. TROUBLE SHOOTING
5.11 7-segment LED trouble
Check Points
-Signal path is connected well
START
Check TP1 is
high (2.9V)?
Check TP2
waveform
Assemble
Check U201
Check 19pin of
CN100 and Replace
FPCB_LCD
Yes
No
No
Check All of LEDs solder
Yes
TP1
TP2 (pin 19 of CN100)
TP1
TP2
VBAT
CN100
AXT524124
13
12
14
11
15
10
16
9
17
8
18
7
19
6
20
5
21
4
22
3
23
2
24
1
G1
G2
G3
G4
R110
0ohms
C104
0.1uF
2V9_VFM
C103
0.1uF
1V85_LDO
LED_INT
_LED_RESET
SCL
SDA
LED_CNT
TP1
TP2 (pin 19 of CN100)