7-Segment Led Trouble - LG GD310 Service Manual

5. TROUBLE SHOOTING

5.11 7-segment LED trouble

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