Lcd Display Trouble - LG KE820 Service Manual

5. Trouble shooting

5.4 LCD display trouble

Check Points
-LCD assembly status ( FPCB)
-EMI filter soldering
-Connector combination
DIF_RESET
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
2V72_IO
R317
100
FL305 ICVE10184E150R101FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
FL307 ICVE10184E150R101FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
C311
1u
CN303
G1 G2
1 30
2 29
3 28
4 27
5 26
6 25
7 24
8 23
9 22
10 21 R323
11 20 R324
12 19 R325
13 18 R326
14 17
15 16
G3 G4
Check signal
flow via EMI
filter
- 82 -
2V72_IO
R315
100K
FL306 ICVE10184E150R101FR
1 9
DIF_WR
INOUT_A1 INOUT_B1
2 8
DIF_CD
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
DIF_CS
INOUT_A4 INOUT_B4
47
MLED_C4
47
MLED_C3
47
MLED_C2
47
MLED_C1
MLED_A