Lcd Display Trouble - LG GT350 Service Manual

4.4 LCD display trouble

Check Points
-LCD assembly status ( LCD FPCB, Connector on FPCB)
-EMI filter soldering
-Connector combination
RCV_SPK_P
RCV_SPK_N
DIF_VSYNC
DIF_CS
DIF_RD
DIF_WR
DIF_CD
DIF_D7
DIF_D6
DIF_D5
DIF_D4
DIF_D3
DIF_D2
DIF_D1
DIF_D0
DIF_RESET
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Only for training and service purposes
LG Electronics
MAIN To FPCB Connector
FL401 ICVE10054E250R201FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
25pF
FL402 ICVE10054E250R201FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
25pF
FL403 ICVE10054E250R201FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
25pF
Check the connection LCD FPCB
Connector
Check signal flow via EMI filter
Charge Pump
67/115
2V62_VIO VBAT
CN403
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
GB042-40S-H10-E3000
ENBY0036001
Socket
- 71 -
4. TROUBLE SHOOTING
X+
X-
Y+
Y-
LCD_ID
KEY_ROW6
KEY_COL3
KEY_COL4
KEY_COL5
SLIDE_KEY_BL
LCD_BACKLIGHT_EN
IF_MODE0
LGE Internal Use Only
LGE Property