On 4 Mar 2005 08:12:11 -0800, wrote:

I just picked up, from a moving neighbor who left it behind, an old 27"
Sony KV2781R, mfd March 1987. I can't pass up a freebie. When you
push the on-off switch there is a click and a degaussing sound, but
nothing more. Are there any frequent/common problems that I should
look for first. I don't want to rebuild the whole set, but hate to
just add this to the collecting garage in our landfills until I give it
a go. I have a scope, but no schematic for this particular set. Been
doing tv repairs since vacuum tube days, for those of you who remember
what they are. :-)

Advice appreciated.

H. R.(Bob) Hofmann


The most common problem I see with these is failure of the horizontal
output transistor and voltage regulator (SRT3130, I think). There's a
small capacitor (about .47 uF) near the vertical IC heat sink that's
in the horizontal drive circuit. It fails from heat and causes the
HOT to fail. The flyback can fail, but most just need the cap, HOT
and regulator. Be aware that the CRT is probably not looking its best
anymore. If you can fix it yourself, it might be worth it, but I
wouldn't pay to have it repaired.
Andy Cuffe

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