Hi,

Im working on a NEC TV that has no vertical deflection (white
horizontal line). There is no O/P on Pin 1 which is the vertical drive
to the deflection amp (TDA3654). I have replaced the TDA2579 chip and
still no drive on pin 1. Checked pin 3 with external cap and there is
a proper sawtooth waveform there. Pin 2 has about 1.8V on it taking it
just short of blanking the sandcastle O/P. Pin 4 (vert def current)
appears dead which i assume would be due to no drive to vert amp and
then no O/P. I have lifted off pin 1 of the TDA2579 and still nothing.

Any idea's to what could be causing this? there is horizontal
defelection so chip has to be powered up. Could there being no
feedback cause it to have no O/P, therefore the vertical amp possably
being dead?

Cheers,
Shaun