If you use a sub par 2SC4927 , this is what happens.

If you are a servicer with a resale # , Call Universal Semiconductor for a
good quality part. 1-800-222-2321


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Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)

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"If you push something hard enough it will fall over."
Fudd's First Law of Opposition - Sir Sidney Fudd


"Vector Viper" wrote in message
...
I am working on 2 Sony KV-27TS29 TV chassis, from 1993.

both came in with the typical symtom for these sets; bad regs (C4834) the
black VDR,
and blown hor output (C4927) too, started by a bad connection.

Usually, replacing these parts and soldering does the trick, not with
these
2....
Both sets run the Hor out too hard/hot, killing it in no more than 5-10
mins.
The picture looks perfectly normal during this short run time.
If you go into set-up and turn the width down, there is a slight
compression/fold on the right side,
I have seen this before in other sets (Mitsubishi) it always means the
output runs hot when this
is seen. (It's overstressed, not turning off fast enough?)

Has anyone seen a fix for this? I suspect hor drive transformer, yoke or
flyback, in that order...

Also, does the manufacturer of a particular C4927 hor out have better
specs
than others?
I have heard of cheaper rip-offs that just do not work...
Should I buy this part from Sony only?

Thanks for helping,
Aaron H.