LG KE820 - Text message

5. Trouble shooting
- 82 -
5.4 LCD display trouble
Check Points
-LCD assembly status ( FPCB)
-EMI filter soldering
-Connector combination
ZD1
ICVE10184E150R101FRFL306
5
G1 G2
10
1
INOUT_A1
INOUT_A2
2
3
INOUT_A3
INOUT_A4
4
INOUT_B1
9
8
INOUT_B2
INOUT_B3
7
6
INOUT_B4
5
G1 G2
10
1
INOUT_A1
INOUT_A2
2
3
INOUT_A3
INOUT_A4
4
INOUT_B1
9
8
INOUT_B2
INOUT_B3
7
6
INOUT_B4
C311
1u
ICVE10184E150R101FRFL305
47R324
R323 47
2V72_IO
47R325
47R326
2V72_IO
INOUT_A2
INOUT_A3
3
4
INOUT_A4
9
INOUT_B1
INOUT_B2
8
7
INOUT_B3
INOUT_B4
6
FL307 ICVE10184E150R101FR
G1
5
10
G2
INOUT_A1
1
2
ZD2
30
17
18
19
20
21
22
23
24
G1 G2
G3 G4
14
15
2
3
4
5
6
7
8
9
16
25
26
27
28
29
CN303
1
10
11
12
13
R317
100
R315
100K
MLED_A
MLED_C1
MLED_C2
MLED_C3
MLED_C4
DIF_RESET
DIF_CS
DIF_WR
DIF_CD
DIF_D(0:7)
DIF_D(0)
DIF_D(1)
DIF_D(2)
DIF_D(3)
DIF_D(4)
DIF_D(5)
DIF_D(6)
DIF_D(7)
Check signal line disconnection
of the LCD FPCB
At first check the LCD back light
enable signal
Check signal
flow via EMI
filter