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NO
NO
NO
Is IC4140 (TOP268VG) dam-
aged?
Is D4142, D4143, D4144,
D4145 or IC4140 damaged?
Repair the short circuited area
on the PCB.
Check the damaged parts.
Replace the damaged part.
Replace the damaged part.
Is the fuse (F4140) functioning
properly?
Are there any short circuits
caused by the soldering on
the PCB?
Are any parts damaged?
Replace the IC4140
(TOP268VG) and D4142 /
D4143 /D4144 / D4145.
DC 5V is not output.
2
1
3
5600/6.
3
C
416
4
R
415
8
3K
3
D
414
0
1N
400
7
D
414
1
1N
400
7
C
415
3
G
R
M
31
C
7U
3A
102JW32
L
R4155
R4156
4K7
OPTION
R4164
1M
R4142
1M
R4141
1M
1M
R
414
5
ZJ7.5B
ZD4160
ZD4163
ZD4162
OPTION
OPTION
ZD4149
ZJ39B
ZD4165
ZJ15B
OPTION
ZD4147
ZJ39B
R4151
11K
O
PE
N
C
416
9
D4146
1N4007
ZD4150
ZJ27B
ZD4156
ZJ22B
ZD4157
ZJ22B
ZD4154
ZJ22B
ZD4153
ZJ22B
ZD4151
ZJ22B
C
415
4
100
N
-K
!
D4147
AP01C
R4154
10
1N4007
D4148
OPTION
C4156
2200P/250V
!
BKT4142
C4165
100N-K
C
417
1
O
PE
N
!
R
414
3
330
K
C
414
7
100
N
-K
C
414
5
100
N
C
414
6
100
N
C
415
0
O
PE
N
OPEN
ZD4161
ZD4164
C
415
1
100
/200(
NH
A
)
R
414
7
270
K
ZD4148
ZJ39B
R4152
10K
ZD4155
ZJ22B
ZD4152
ZJ22B
!
D4150
1SS133T
C4160
1UF-K
4700
N
-K
C
416
1
100
N
-K
C
415
9
5600/6.
3
C
416
2
5600/6.
3
C
416
3
IC4143
KIA2431AP
0.01UF/250V
C4149
D4145
1N4007
D4144
1N4007
D4143
1N4007
D4142
1N4007
0.01UF/250V
C4148
1
12
2 3
10
4
8
9
6
7
11
IC_TOP268VG
IC4140
S
V
S
S
X
C
S
S
F
S
D
R4153
6R8
C4152
47/25(NXA)
ZD4158
ZJ39B
R
415
0
1M
R
414
9
2M
2
R
414
8
2M
2
TR4142
KTC3198G
C4157
OPEN
D4149
S30SC6MT
10/50(NXA)
C4155
4
10
6
5
2
12
9
13
W
1
3
W
4
W
3
W
5
W
2
EE2525
T4140
3
2
1
TR4141
INK0010AC1
IC4142
PC123X2YFZ
RLY4140
JZC-36FD/005-HLT
A
B
C
After primary side rectification
(Caution: High voltage, electric shock)
Primary drain
(Caution: High voltage, electric shock)
After secondary rectifications
Operation waveform for each part
A
B
C
A
B
C
SMPS unit
(Unloaded)
Set
YES
YES
YES
YES
YES
YES
6. SMPS
81
Caution in
servicing
Electrical
Mechanical
Repair Information
Updating