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5. Trouble shooting
5.4 LCD display trouble
Check Points
-LCD assembly status ( LCD FPCB, Connector on FPCB)
-EMI filter soldering
-Connector combination
END_KEY
SUB_KEY_BL
KEY_ROW4
KEY_ROW5
KEY_ROW6
KEY_COL4
KEY_COL5
KEY_COL6
KEY_COL7
TOUCH_SCL
TOUCH_SDA
TOUCH_INT
DBB_BL_PWM
RCV_P
RCV_N
LGE Internal Use Only
MAIN To FPCB Connector
VBAT
FL403
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
Check the connection LCD FPCB connector
Check signal flow via EMI filter
2V62_VIO
2V8_VVIB
CN400
1
40
2
39
3
38
4
37
5
36
6
35
7
34
8
33
9
32
10
31
11
30
12
29
13
28
14
27
15
26
16
25
17
24
18
23
19
22
20
21
Socket
The LCD backlight enable signal
(SUB PCB)
Copyright © 2008 LG Electronics. Inc. All right reserved.
- 72 -
FL400
ICVE10054E250R201FR
1
9
IF_MODE3
INOUT_A1
INOUT_B1
2
8
LCD_ID
INOUT_A2
INOUT_B2
3
7
DIF_RESET
INOUT_A3
INOUT_B3
4
6
DIF_VSYNC
INOUT_A4
INOUT_B4
FL401
ICVE10054E250R201FR
1
9
DIF_RD
INOUT_A1
INOUT_B1
2
8
DIF_WR
INOUT_A2
INOUT_B2
3
7
DIF_CD
INOUT_A3
INOUT_B3
4
6
DIF_CS
INOUT_A4
INOUT_B4
FL402
ICVE10054E250R201FR
1
9
DIF_D(0)
INOUT_A1
INOUT_B1
2
8
DIF_D(1)
INOUT_A2
INOUT_B2
3
7
DIF_D(2)
INOUT_A3
INOUT_B3
4
6
DIF_D(3)
INOUT_A4
INOUT_B4
FL404
ICVE10054E250R201FR
1
9
INOUT_A1
INOUT_B1
DIF_D(4)
2
8
INOUT_A2
INOUT_B2
DIF_D(5)
3
7
INOUT_A3
INOUT_B3
DIF_D(6)
4
6
INOUT_A4
INOUT_B4
DIF_D(7)
Only for training and service purposes
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Table of Contents
Troubleshooting
