Alasdair Campbell wrote:
Hi,

I'm trying to research a fault a friend's TV has. A picture paints a
thousand words, so two shots follow this brief description.

Sharp 28JW-73H / 29JW73H (GA200 Chassis)

After the TV has been turned on for a few minutes a strong green and
yellow flicker appears on all inputs. I will have the opportunity to
preform a visual fault finding investigation in the next couple of days,
but in the meantime does this fault ring any bells with the engineers in
this forum?

The photo shows a bar, but in real-time, the bar is not visible, just a
stomach churning flicker at high freq. There is no vertical rolling
visible either.


best,

Alasdair

Photos:

http://www.alasdaircampbell.com/flicker.jpg
http://www.alasdaircampbell.com/flicker2.jpg

I assume we are talking about CRT Display !

A problem with the Degaussing Circuit ?? affecting the Electron
Beam,only. Not the Power Supply and the Sync , and Video circuits

After a few seconds the Degaussing circuits should shut down.
In this case , it does not ! and would apparently affect all inputs.

It looks like my CRT Monitor, a few seconds into Warm-up when the
Degaussing Circuit is still Active !

The Flicker is due to the fact that your scan rate isn't the same or
close to the
Power Line Frequency ???

Yukio YANO