Table of Contents
Advertisement
6. SMPS
DC 5V is not output.
YES
Replace the [U4140 : TOP268VG
Is [U4140 : TOP268VG] dam-
and D4142 / D4143 / D4144 /
aged?
D4145].
NO
YES
Is the fuse [F4140] functioning
Is [D4142 / D4143 / D4144 /
properly?
D4145 / U4140] damaged?
NO
YES
Are there any short circuits
Repair the short circuited area
caused by the soldering on the
on the PCB.
PCB?
NO
YES
Are any parts damaged?
Check the damaged parts.
Operation waveform for each part
YES
Replace the damaged part.
YES
Replace the damaged part.
86
A
After primary side rectification
(Caution: High voltage, electric shock)
(Caution: High voltage, electric shock)
OPTION
OPTION
OPTION_2
OPTION
OPTION
OPTION
U4140
TOP268VG
IC_TOP268VG
SMPS unit
A
(Unloaded)
A
Set
B
Primary drain
C
After secondary rectifications
1
3
2
T4140
EER2525
BKT4142
OPTION
B
C
B
C
Advertisement
Table of Contents
