NO POWER
TROUBLESHOOTING GUIDE
Is the voltage at the point (A)
in the Figure DC144V ?
No
Is the voltage at the point (B)
in the Figure DC164V ?
No
Is the voltage at the point (C)
in the Figure AC120V ?
No
Yes
Yes
Yes
Is the voltage at pin G
of Q501 DC5V ?
No
Check Q502 and associated circuit.
Check R501 and check associated
circuiit.
Check the rectifying circuit.
Yes
Q501
Check Q501 and associated circuit.
T502
A
D
S
Q502
G
68
R508
IC501
3
D501~D504
R501
B
Is the voltage at the point (E)
in the Figure AC120V ?
No
Is the voltage on both
ends of S501 AC120V ?
No
Broken wire of AC cord or check
S501.
Yes
Yes
Broken wire of L501.
C
L501
Broken wire of F501.
E
F501
S501
CD501
NO RASTER
TROUBLESHOOTING GUIDE
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
No
Is the high voltage of
ANODE 27KV~28KV ?
No
Is collector voltages
of Q401 DC130V and
Q402 DC27V ?
No
Yes
Yes
Yes
Is the voltage of pin 1 of
CP803 DC184V ?
No
Check the 180V line.
Is the heater voltage at
pin 4 of J801 AC6.4V ?
No
Check the HEATER circuit.
Yes
Yes
Check the output circuit and
associated circuit.
Contact defects of CRT or CRT
Socket.
Check FB401 and associated circuit.
Is the waveform at base
of Q401 normal ?
No
Is the waveform at pin
46 of IC101 normal ?
No
Check IC101 and associated circuit.
Yes
Yes
Check Q402 and associated circuit.
Check the circuit from pin 46 of
IC101 to Q402.
NO COLOR
TROUBLESHOOTING GUIDE
Are the waveforms at pin 3,
7 and 9 of J801 normal ?
No
Are the waveforms at pin 3,
4 and 5 of CP802 normal ?
No
Are the waveforms at
pin 50, 51 and 52 of
IC101 normal ?
No
Is the pulse of crystal
X601 normal ?
Yes
Yes
Yes
Yes
Defect of CRT or contact defects
of J801.
Check the output circuit and
associated circuit.
Check R, G, B signal output from
IC101 to R, G, B output circuit.
Check the associated circuit of IC101.
No
Check X601.
NO VERTICAL
TROUBLESHOOTING GUIDE
Is the waveform at pin
5 of CP401 normal ?
No
Is the waveform at pin
5 of IC401 normal ?
No
Is the waveform at pin 7
of IC401 normal ?
No
Is the waveform at pin
38 of IC101 normal ?
Yes
Yes
Yes
Yes
Is the waveform at pin
2 of IC401 normal ?
No
Check the 25V line.
Yes
Check DY.
Check the circuit from pin 5 of
IC401 to CP401.
Check IC401 and check peripheral
circuit.
Check the circuit from pin 38 of
IC101 to pin 7 of IC401.
No
Check the associated circuit of IC101.
NO SOUND
Is sound setting appropriate ?
Yes
TROUBLESHOOTING GUIDE
Is the waveform at pin 6
and 8 of IC1001?
No
Is the Audio signal input at
pin 27 of IC101?
No
Check J703 and associated.
Yes
Yes
Check speaker and ear phone jack.
Check IC101 and associated circuit .
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