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SAMSUNG Proprietary-Contents may change without notice
5-9
Flow Chart of Troubleshooting and Circuit Diagram
5-9 SGH-A300 Back Light
Backlight does not work
Y
Y
N
Y
Backlight
“ON” mode in
the menu ?
Select backlight “ON” mode
N
Y
CN601 pin 3 = “High” ?
Check M46(U201)
using Factory Test Program
N
Y
Check the
connection from CN601
to LCD Module
Replace flexible PCB
N
Y
LCD backlight on ?
Replace LCD Module
END
ZD604
Write
C611
33PF
Q202
100K
VCCD
C608
33PF
Kbd_Rtn2
Kbd_Rtn0
Flip_Sns
11
CN602
1
1
10
10
11
R609
Red_Led_En
Green_Led_En
Kbd_Strb3
Kbd_Strb4
Kbd_Strb7
Kbd_Strb2
Kbd_Strb0
Kbd_Rtn1
Kbd_Strb6
Kbd_Strb1
Kbd_Strb5
33PF
C609
KEY_PAD_CTL
SLCD_CS
MLCD_CS
Reset_B
Mtr_En
Spkr-
LED_CTL
2
3
1
4
5
5
6
6
7
7
8
8
9
9
R220
330
Green_Led_En
Red_Led_En
Q203
2
3
1
330
R219
1
2
3
4
5
6
V620
ZD603
1
2
3
4
5
6
U201
M46
G11
C14
Red_Led
Green_Led
CN601
33PF
C647
15
16 16
17 17
18
18
19
19
2
2
20 20
3
3
4
1
1
10
10
11
11
12
12
13
13
14
14
15
VBA
T
VCCD
9
9
2
2
20 20
3
3
4
4
5
5
6
6
7
7
8
8
12
12
13
13
14 14
15 15
16 16
17 17
18 18
19
19
Check the connection between
CN601 and LCD Module.