2. NO RASTER (The power is normal but the heater voltage is “LOW”)
START
END
Check the voltage between pin 1 of IC51
and GROUND.
Is it Low ?
Check the COLLECTOR waveform
of Q404.
OK?
Check the waveform of pin
33 of IC51.
OK?
Check the open circuits of R911,
R912,D911 in CPT PCB.
Is there No Picture?
Check the BASE waveform of Q404.
OK?
Check the pin 1,2,3 waveforms
of IC91 in CPT PCB!
Check the pin 7,8,9 waveforms
of IC91.
Check the pin 6 voltage of IC91.
OK?
Check the output voltage of
IC52, IC83, and IC53.
Check the waveform
of X001(12MHZ).
Check the voltage of C481 +
(ST-BY:11.5V, ON:5.9V).
Check the open circuit of R481.
Check the short circuit of Q402.
Replace IC91 with new one.
Replace C904 with new one.
Check the short circuits of
D281.
Check the open circuits of
R281.
Replace it with new one!
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
2.5Vpp
TROUBLE SHOOTING
HOUT
Summary of Contents for CTV-1015
Page 1: ...Service Manual CTV 1015 R CTV 1015 Service Manual CTV 1015...
Page 19: ...BLOCK DIAGRAM Full bridge vertical deflection output circuit in LVDMOS TDA8357J...
Page 21: ...TUNER TERMINAL FOR EXTERNAL CONNECTION ELECTRICAL CHARACTERISTICS...
Page 22: ...TUNER RECEIVING CHANNEL FREQUENCY TABLE...
Page 23: ...TUNER RECEIVING CHANNEL FREQUENCY TABLE...
Page 24: ...TUNER RECEIVING CHANNEL FREQUENCY TABLE...
Page 28: ...TV sound AM demodulator and audio source switch TDA9830...
Page 29: ...TV sound AM demodulator and audio source switch TDA9830...
Page 30: ...TV sound AM demodulator and audio source switch TDA9830...
Page 38: ...BLOCK DIAGRAM...