Troubleshooting Guide
NO RASTER
Check +B voltage at J405
Is the voltage at pin8,37
of IC501 8V?
Does the square
waveform from pin40 of
IC501 appear?
Is the waveform of
collector of Q451 normal?
Is the waveform of
collector of Q452 normal?
Check/Replace
T701
Check
Fuse of AC line
Check the voltage of
C808, C809
Check the voltage
of pin9 of IC801
Check/Replace
IC803, D835, D829
Check the 12V, 5V lines are
shorted.
Check/Replace
IC501
Check/Replace
Q451, T451, R452
Check/Replace
Q452
Check the voltage 5V,
12V lines
Check I2C BUS lines
(SDA, SCL)
Check/Replace
Fuse, D801, IC801
Check/Replace
D801
Check/Replace
D802, D805, D807,
Q801, IC801
Normal
Yes
Yes
Yes
Yes
No
No
No
No
OK
OK
254~380V
Lower than 6V
Open
0V
0V
NO SOUND
(PICTURE OK)
Check the Audio signal of
pin12 of IC101 normal
Check the Audio signal of
pin55 of IC601 normal
Check/Replace
Q605, AM line
Check whether Sound
system of MENU OSD
is correct or not
Is the SIF signal of
pin20 of IC101 normal?
Are the Audio signal of
pin28, 29 of IC601 normal?
Are the Audio signal of
pin2, 5 of IC651 normal?
Are the Audio signal of
pin7,11 of IC651 normal?
Check/Replace
C660, C664, Speaker
Set correct Sound
system
Check/Replace
IC101
Check/Replace
X601, IC601, IC602
Check Ro, Lo lines
Check the voltage
of pin10 of IC651
Check/Replace
IC101
NO
Yes
No
Yes
Correct
Yes
Yes
Yes
Yes
Incorrect
No
No
No
No
(No AM Sound) (No NICAM or FM Sound)
NO PICTURE/NO SOUND
(RASTER OK)
Does the Auto programme
operation?
Is the CVBS signal of pin10
fo IC101 normal?
Go to NO PICTURE Block,
NO SOUND Block
Check/Replace
IC101
Check/Replace
ZD182, 5V, 12V, 33V
power lines
Check the voltage
5V, 12V, 33V of Tuner
Check I
2
C BUS
lines (SDA, SCL)
Check/Replace
Tuner
Yes
Yes
No
OK
OK
NG
No
NO RASTER
(SOUND OK)
Check the voltage of
CPT Heater
Check the voltage of HV,
SCREEN of CPT
Check/Replace
CPT Board
Check/Replace
T701
Check/Replace
T701
Check the Heater pulse of
pin 9 of T701
Check/Replace
Connector, FR705, FR901
Normal
Normal
Normal
Abnormal
Abnormal
Abnormal
NO PICTURE/NO COLOR
Is the CVBS signal of pin10 of
IC101 normal?
Check/Replace
IC101
Check/Replace
IC201
Check/Replace
Q151
Check/Replace
IC150
Check/Replace
Q150
Check/Replace
IC502
Check/Replace
IC502
Check/Replace
IC501
Is the CVBS signal of pin16 of
IC201 normal?
Is the CVBS signal of pin 3 of
IC150 normal?
Is the CVBS signal of pin 2 of
IC150 normal?
Is the CVBS signal of pin13 of
IC501 normal?
Is the Y signal of pin 27 of
IC501 normal?
Are R-Y, B-Y signal of
pin 31,32 of IC501 normal?
Are R,G,B signal of
pin19, 20, 21 of IC501 normal?
Check CPT Board
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No
No
No
No
No
No
NO TELETEXT
Check the voltage
5V of C845
Check/Replace
L154
Check whether video signal is
at the pin16 of IC201 or not
Check the CVBS line
Check/Replace
IC150, IC151
Check the voltage of C176
Check whether video signal is
at pin3 of IC150 or not
Check I
2
C BUS lines
(SDA, SCL)
Check pin19, 20, 22, 23
of IC150
Check/Replace
IC501
Check the 5V line
to be correct
Check/Replace
IC201
Abnormal
No
Abnormal
No
Yes
Abnormal
Normal
4.8~5.2V
Yes
OK
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