Durabrand DTV1307 Service Manual page 20

NO RASTER
Does the RASTER
appear at maximum
BRIGHT/CONTRAST ?
No
Is the high voltage of
ANODE 27KV~28KV ?
No
Is collector voltages
of Q402 DC130V and
Q401 DC127V ?
No
Is the waveform at base
of Q402 normal ?
No
Is the waveform at pin
44 of IC102 normal ?
No
Check IC102 and associated circuit.
TROUBLESHOOTING GUIDE
Yes
Is the voltage of pin 4 of
CP803 DC180V ?
Check the 180V line.
Yes
Is the heater voltage at
pin 4 of J801 AC6.4V ?
Check the HEATER circuit.
Yes
Yes
Yes
E-2
Yes
No
Yes
No
Check the output circuit and
associated circuit.
Contact defects of CRT or CRT
Socket.
Check FB401 and associated circuit.
Broken wire at pin 6 of T401.
Check the circuit from pin 44 of
IC102 to Q401.