TROUBLESHOOTING
Check voltage of C806(+)
1. No Power (Not working SMPS)
Check the voltage at
pin4 of IC803
Check / Replace
F801, SW801, T801 & DB801
R811,TH803 (option)
130 ¡- 380V 0V
Check / Replace
T802,D806 & R815
Check / Replace
IC803 and
secondary part
of power circuit
Check / Replace
R806, IC801 & R804
0V
17¡-19V
2. No Power On (SMPS working)
Check Micom On/Off port
Check / Replace
R817,Q807,
IC802 & IC844
Check / Replace
MICOM
ON OFF
Check / Replace
Q401,T401,R412,
R418 & R405
Check / Replace
IC501
2.0V
OV
Check H-Out voltage at
Pin32 of IC501.
Check / Replace
IC501
Check / Replace
R303,R304
C301,C311
IC301
4.9V
0V
Check the Voltage
at Pin 13 of IC501
OK
3. No Power off (SMPS working )
Check / Replace
Q801,D842&D844
Check +B
at D807 cathode
Check the voltage at (pin3,
17,28,52) of IC501 ?
Check
F801 of AC line
Check the voltage
of C806
Check the voltage
of pin4
Check the voltage at
pin32 of IC501(H-out)
Check Q401
collector waveform
Check T401
& each pin voltage
Check the collector
waveform of Q402
Check & Replace
IC501
Check & Replace
Q401
Check & Replace
R405,C408,T401
Check the in/out
of IC844
Check at pin5
of Micom?
Check /Replace
Q807
Check /replace
D806,IC803 ,
R809 & R811
Check /replace
Fuse,DB801& IC803
Check /replace
TH803(option)
Normal Abnormal
9V
5V
Yes
OK
No
No
No
OK
254~380V
Open
0V
4. No Raster
Check /Replace
C402,C414,Q402
OK
No
No
No
Check the
Heater voltage of CPT
(6 6.5Vrms)
Check
FR401,P902A & P902B
Check
FBT (T402)
Check the
Heater pulse of FBT
T701
No
OK Not OK
Check/Replace
CPT Board
Components
OK
OK
Check
HV & Screen voltage of
CPT
Check
the voltage
at pin1 of P902A
No
6. No Raster / Sound OK
180~190V
Check/Replace
FBT (T402)
Check/Replace
Q901,Q902 & Q903
No
~
Is any OSD displayed?
Check receiving system in MENU
& excute Auto-program.
OK
OK
No
Check pin1(H-Sync),
pin2(V-Sync) of IC01
Check IC01 pin19(XLS),
pin20(EXLC) of IC01
No
Go to
NO SOUND /
PICTURE OK
Does the Auto-program
operate properly.
Store in manual-program MENU
Check 5V, 33V & IIC Bus Line
of TUNER(TU101)
Is the CVBS signal OK.
( pin47 of IC501)
Check R,G,B signal
at pin18,19,20 of IC501
Check
5V, 33V &
IIC Bus Line
OK
No
No
OK
Check / Replace
TUNER, IC501
No
OK
Check / Replace
CPT Board component
Check
CVBS signal Line
& IC501
Check pin40(B),41(G),42(R)
of IC01
OK
No
7. No Picture / No Sound
OK
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