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SAMSUNG Proprietary-Contents may change without notice
Level 3 Repair
8-19
This Document can not be used without Samsung's authorization
8-8. Back Light (LCD)
LCD CON
TP_RST_LCD
TP_LD_CS_LCD
TP_LD_WR_LCD
TP_LD_RS_LCD
C432
TP_LD_RD_LCD
C434
C430
C433
VDD_TSP_3V0
C435
VDD_LCD_2V9
R433
VDD_TSP_3V0
5
5
6 6
7
7
8 8
9
9
41
G
42
G G
43 44
G
35 35
36 36
37
37
38
38
39
39
4 4
40 40
28 28
29
29
3
3
30
30
31 31
32 32
33
33
34
34
20 20
21
21
22
22
23 23
24 24
25
25
26
26
27 27
12 12
13
13
14
14
15 15
16 16
17
17
18
18
19 19
2
2
HDC401
1
1
10
10
11 11
TP_LD(0)_LCD
TSP_SDA
TSP_SCL
TSP_INT
RST_LCD
VGH
LD_RS_LCD
LD_WR_LCD
LD_CS_LCD
LD(4)_LCD
LD(5)_LCD
LD(7)_LCD
LD(6)_LCD
LED+_18.2V
LCD_FLM
LED-
LD(3)_LCD
LD(2)_LCD
LD(1)_LCD
LD(0)_LCD
LD_RD_LCD
BACKLIGHT DRIVER IC
L413
C428
R409
L417
R411
C455
C454
VBAT
C3
CS
D1
RSET
D2
OVP
D3
1
NC
2
LX
A1
IN
A2
EN|SET
A3
PGND
B1
PWM
B3
GND
C1
COMP
U402
NC
R
4
08
D402
R410
C429
LED-
BL_EN
LED+_18.2V
LCDt does not work
Yes
Check the LCD FPCB
(connection, broken)
No
Change the LCD or connect the FPCB to
HDC401 correctly.
Yes
Resolder the C432
or check the PM300 is working
No
The Voltage at C432
= 2.9V ?
Yes
END
Yes
Check the Backlight Driver
IC(U402) circuit
(connection, broken)
Replace the U402 or
resolder the components around U402.
No