akira 14THS3/CE, Руководство по обслуживанию

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11
Model No: 14THS3 / CE.doc
Version 1.0
FAULT FINDING TREES
A Three-None(no raster, no picture, no sound)
This failure is mainly caused by big-power circuit such as power supply, horizontal scanning, vertical scanning.
The detail checking and repairing steps are as follow.
0V
4.5-5.5V
YES
0V
1V
0.6V
300V
NO
YES
0V
300V
0V
0V
115V
No variation
Normal
115V
0V
Others
24V
2V
8V
115V
LOW
NO
variation
50V
Test the voltage of C528B
Cut off R458
T
T
T
e
e
e
s
s
s
t
t
t
o
o
o
t
t
t
h
h
h
e
e
e
r
r
r
v
v
v
o
o
o
l
l
l
t
t
t
a
a
a
g
g
g
e
e
e
s
s
s
u
u
u
c
c
c
h
h
h
a
a
a
s
s
s
1
1
1
8
8
8
8
8
8
V
V
V
,
,
,
2
2
2
4
4
4
V
V
V
,
,
,
a
a
a
n
n
n
d
d
d
1
1
1
2
2
2
V
V
V
VD525,VD1561,VR501,V542,
VD1517,V504,V1511
Check VD522,C528B
Recover R458, unplug
XS403 for a While,then
test the voltage of C528B
Check V451,T451,T450,
Deflection coil
Check L452,VD436,C461
Deflection coil
Voltage of C507
Check if V1513 collect-emitter
Was broken down
Check XR502,F501,power
Swich, AC cord and plug
Check the voltage
of V1513 collector
Check V1513,V1512,F501,XR502,VD503
Check T501
Test voltage of V1513 base
Check T501,VD1517,
C1515,C1517,V451,
VD522-VD529
C455,C456,T451
C467
Check if it get right
When cut off V504
Test the voltage of
N301 pin1
CPU has sent the
Power-off signal Check if V504
is broken down
Check V1513
Check R539,V1553,VD1561
N504,V1511,V1512,R556
N301 pin39voltage
N301 pin33 voltage
Check N301,N401
V450 pin C voltage
Check VD543,C525,
]R454,C453,T450,
C455,V451
Check R452,V450
Check T451
Check V451 pin C voltage
Check T451,V451,R458
130V
Others
115V
0V