LG GX500 - LCD Display Trouble

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Only for training and service purposes
4. TROUBLE SHOOTING
GX500 Operational Description Revision A
LG Electronics 80/143 LGE Property
4.4 LCD display trouble
Check Points
-LCD assembly status ( LCD FPCB, Connector on FPCB)
-EMI filter soldering
-Connector combination
Figure 4-9. LCD Connector circuit
Charge Pump
Check signal flow via EMI filter
Check the connection
L
CD FPCB Connector
Figure 4-10. LCD FPCB Connector
Figure 4-11. Charge Pump
DNIR817
TP801
C817
1U
CN804
21 20
22 19
23 18
24 17
25 16
26 15
27 14
28 13
29 12
30 11
31 10
32 9
33 8
34 7
35 6
36 5
37 4
38 3
39 2
40 1
2V85_VFM
VA804
EVLC14S02050
EVRC14S03Q030100R FL803
01
5
6 4
7 3
8 2
9 1
INOUT_A1
INOUT_B1
INOUT_A2INOUT_B2
INOUT_A3INOUT_B3
INOUT_A4INOUT_B4
1G
2
G
FL804
EVRC14S03Q030100R
0
1
5
64
73
82
91
INOUT_A1 INOUT_B1
INOUT_A2 INOUT_B2
INOUT_A3 INOUT_B3
INOUT_A4 INOUT_B4
1G 2G
FL805 EVRC14S03Q030100R
0
1
5
64
73
82
91
INOUT_A1
INOUT_B1
INOUT_A2 INOUT_B2
INOUT_A3 INOUT_B3
INOUT_A4 INOUT_B4
1
G
2G
LCD_ID
DIF_D0
DIF_D1
DIF_D2
DIF_D3
DIF_D4
DIF_D5
DIF_D6
DIF_D7
DIF_CS
DIF_RD
DIF_WR
MLED5
MLED4
MLED3
DIF_RESET
MLED
MLED2
MLED1
DIF_CD
MLED6
IF_MODE0
IF_MODE1
DIF_VSYNC
LCD_PWM
LCD CONNECTOR
GB042-40S-H10-E3000
ENBY0036001