Samsung 920NW Service Manual - Page 22
Black Screen and backlight turn on, Check: X1, C147
 |
UPC - 729507800905
View all Samsung 920NW manuals
Add to My Manuals
Save this manual to your list of manuals |
Page 22 highlights
4-5 Black Screen and backlight turn on Black Screen 4 Troubleshooting Check power supply: Pin1, 2 of CN102 Yes Check pin34, 51, 66, and 82 Of U105 Yes Check pin12, 68, 97 and 117 Of U103 Yes Check Reset (pin19) Of U103 Yes Check Crystal: Pin32, Pin33 Of U103 Yes Check CCFLEnable (pin20) of U103 No MCU Fail No Power Fail No Check FB103 And U102 No Check FB105 And U106 No Check C149, R157 No Check: X1, C147, C148 Yes Check pin5 of Yes CN102 Inverter Fail No Check R127, Q101, R125, R126 4-5
-
1 -
2
-
3
-
4
-
5
-
6
-
7
-
8
-
9
-
10
-
11
-
12
-
13
-
14
-
15
-
16
-
17 -
18 -
19 -
20 -
21 -
22 -
23 -
24 -
25 -
26 -
27 -
28
-
29
-
30
-
31
-
32
-
33
-
34
-
35
-
36
-
37
-
38
-
39
-
40
-
41
-
42
-
43
-
44
-
45
-
46
-
47
-
48
-
49
-
50
-
51
-
52
-
53
-
54
-
55
-
56
-
57
-
58
-
59
-
60
-
61
-
62
-
63
 |
 |
4 Troubleshooting
4-5
4-5
Black Screen and backlight turn on
Black Screen
Check power
supply: Pin1, 2 of
CN102
Power Fail
No
Check pin34, 51,
66, and 82 Of
U105
Check FB103 And U102
No
Yes
Check pin12, 68,
97 and 117 Of
U103
Check FB105 And U106
No
Yes
Check Reset
(pin19) Of U103
Check C149, R157
No
Yes
Check Crystal:
Pin32, Pin33 Of
U103
Check: X1, C147, C148
Inverter Fail
MCU Fail
Check R127, Q101,
R125, R126
No
Yes
Check CCFL-
Enable (pin20) of
U103
Check pin5 of
CN102
Yes
No
No
Yes
Yes