Lcd Display Trouble - LG KE600 - Cell Phone Service Manual

5. Trouble shooting

5.4 LCD display trouble

Check Points
-LCD assembly status ( FPCB)
-EMI filter soldering
-Connector combination
DIF_D0
DIF_D1
DIF_D2
DIF_D3
DIF_D4
DIF_D5
DIF_D6
DIF_D7
JOG_PWDN
JOG_DISK_B
JOG_DISK_A
RCV_N
RCV_P
ccking Point
Check signal line disconnection
of the LCD FPCB
2V85_MMC 2V72_IO
MLED
MLED1
MLED2
MLED3
FL506 ICVE21184E150R101FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
FL507 ICVE21184E150R101FR
1 9
INOUT_A1 INOUT_B1
2 8
INOUT_A2 INOUT_B2
3 7
INOUT_A3 INOUT_B3
4 6
INOUT_A4 INOUT_B4
C511 C512 C513
56p 0.1u 56p
At first check the LCD back light
enable signal
VBAT
1
CN503 2
1 50 3
2 49 4
3 48
VBACKUP
4 47
5 46
6 45
7 44
8 43
9 42
10 41
11 40
12 39
13 38
14 37
15 36
16 35
17 34
18 33
19 32
20 31
21 30
22 29
23 28
24 27
25 26
C514 C515 C516
0.1u 0.1u 56p
LCD CONNECTOR
Check signal flow
via EMI filter
- 82 -
FL505 ICVE21184E150R101FR
9
INOUT_A1 INOUT_B1 DIF_CD
8
INOUT_A2 INOUT_B2 DIF_WR
7
INOUT_A3 INOUT_B3 DIF_VSYNC
6
INOUT_A4 INOUT_B4 DIF_CS
IF_MODE1
DIF_RESET
VIBRATOR-
SLIDE_KEY_BACKLIGHT
KP_IN0
KP_IN1
KP_IN2
KP_IN3
KP_IN4
KP_OUT3
KP_OUT4
END_KEY
LCD_ID