"Bobby Villamor" wrote in message
news:F1fod.301087$nl.261429@pd7tw3no...
Hello everyone.
I am working on a 27in. toshiba color tv model CF27G50. Original trouble
symptom is that
when I push the power button on, the relay clicks supplying power and I
could hear the high
voltage attempting to build up then just about a second the relay clicks
turning the ac supply off.
I have tried disconnecting each low voltage power loads to check which
circuit or component
causes the relay to turn off almost instantly until I reach the high
voltage
section.
When I turn the power button on I see some sparks in the picture tube
electron gun - somewhere
around the filament / cathode area, then the relay turns off.
When I remove the high voltage cap from the picture tube the relay remains
on already, high voltage
is produced but the weird thing is that when I push the power button on
the
pcb or attempt to touch
any ground connection: wire, heat sink, etc., a high voltage arc jumps
from
the ground to my
finger before my finger touches it and I receive a mild electric shock.
Looks like excessive high voltage? But why do arc jumps even when a ground
terminal is touched?
I tried connecting in parallel the two snubber capacitors - those
connected
across h.o.t. with a
capacitor of smaller value but no effect.
I would appreciate any hint, comments or help regarding this problem.
Thank you very much.
Bobby



Usually sparks inside the CRT mean the tube has cracked and needs to be
replaced. Sometimes they crack under the yoke where you can't see it, I had
one I was checkihg out, I went to pull the neck board off and the whole neck
of the tube came off in my hand.