[TechAssist] Re: Sony KV-27HSR10 (1990) H.O.T Overheating....


Hello:
My guess is that you have to replace with a new type
of transistor. Try to order one from Sony. Even though
the transistor have a same number,their
characteristics is a little different.(don't ask me
why).This problem happened to me so many times and I
finally got to order the transistor from Sony.
Also if the TV is larger than 32", I always install
extra piece of Alluminium heat sink.
Hope this help.
Frank
 
--- Bruce Tiedeman <btied@xxxxxxxxxxxx> wrote:
> 
> I can not find the previous post on this problem. I
> put in the original
> Output transistor , I soldered the driver
> transformer and connections in the
> Horiz. section. I did change the .47\50 cap at the
> driver transformer.
> 
> Is there some thing else that has to be changed on
> this chassis. The
> transistor gets very hot. The waveform looks very
> clean at the base of the
> H.O.T . it starts to get hot after a few minutes.
> 
> The original problem was a blown HOT transistor and
> the special damper diode
> . The R523 (.68 ohm resistor ) was over heated but
> not blown. I replaced
> this also.
> 
> If I remember correctly these do run hot, just
> didn't wanted to send this
> out and have it come back...
> 
> thanks for your input,
> 
> Bruce
> B&T Electronics.
> 
> 
> 
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