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No
Is the voltage at pin3
of IC02 5V?
Yes
No
Check / Replace
Check the In/Out
IC01,IC02
of IC842
No
Check the voltage
at D805 or D815
cathode
No
Check / Replace
F812
HV, Screen voltage of
Not OK
Check
FBT T401
TROUBLE SHOOTING
NO RASTER
Is the voltage at pin61,56
& 54 of IC01 3.3V?
Is the voltage at pin14
No
Check &replace
IC01
collector waveform
No
Check &replace
Q402
& each pin voltage
No
Check &replace
T402
NO RASTER / SOUND OK
Check
Check
Ik Current of
CPT
IC01,pin50
OK
Check/Replace
CPT Board
Components
CHECK +B
at D807 cathode
Normal
Yes
& 39 of IC01 8V?
Yes
Check the in/out
of IC844
Check pin33
of IC01(H-out)
Yes
Check IC01
pin1 high?
Check Q402
Yes
Check T402
Yes
Check &replace
T402
Check the
Heater voltage of CPT
(6 ~ 6.5Vrms)
OK
Not OK
OK
Check
FR404,FR902,P302
Check
IC01,ZD901
IC901,P902,P541
- 18 -
Abnormal
Check
FUSE of AC line
OK
Check the voltage
of C806
No
254~380V
Check the voltage
pin3 of IC803
No
Check /replace
IC801,IC803,IC804
Not OK
Check the
Heater pulse of FBT
T401
Not OK
Check
FBT T401
Open
Check /replace
Fuse,DB801
0V
Check /replace
DB801
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