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Sony KV28FX20U Help

 
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PostPosted: Fri Nov 24, 2006 6:16 pm    Post subject: Sony KV28FX20U Help Reply with quote

KV28FX20U set, high pitched noise from inside, Blown 2SC5251 transistor replaced, unit tried to come on but shut down, LOPT replaced with HR8579 (equivalent)
Unit now comes on but picture very dark with visable horizontal lines, turning screen voltage up picture flickers and goes pinkish in colour, Horizontal lines always visable.
Any idea's?

Cheers,
Leo
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Guest






PostPosted: Fri Nov 24, 2006 9:27 pm    Post subject: Reply with quote

Sounds like the replacement transformer is the wrong type and not giving
enough heater voltage and you have to increase the A1 voltage to get a picture.Where did you get it from?
Regards
John.
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leovalve



Joined: 25 Nov 2006
Posts: 3

PostPosted: Sat Nov 25, 2006 1:53 am    Post subject: Reply with quote

Thank you John:)
It was from Charles Hyde http://www.chsinteractive.co.uk/shop/SearchResults.php?altcode=HR8579

Cheers,
Leo
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leovalve



Joined: 25 Nov 2006
Posts: 3

PostPosted: Sat Nov 25, 2006 1:56 am    Post subject: Reply with quote

It was supposed to be the equivalent for this http://www.chsinteractive.co.uk/electrical-components/lopt-sony-8-598-834-40-2.html
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minnie



Joined: 18 Aug 2005
Posts: 2877
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PostPosted: Sun Nov 26, 2006 9:28 pm    Post subject: Reply with quote

leovalve wrote:
It was supposed to be the equivalent for this http://www.chsinteractive.co.uk/electrical-components/lopt-sony-8-598-834-40-2.html


Sony and phillips sets don't like "equivalents" when it comes to hot's and vertical ic's.
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leovalve



Joined: 25 Nov 2006
Posts: 3

PostPosted: Sun Nov 26, 2006 9:43 pm    Post subject: Reply with quote

minnie wrote:
leovalve wrote:
It was supposed to be the equivalent for this http://www.chsinteractive.co.uk/electrical-components/lopt-sony-8-598-834-40-2.html


Sony and phillips sets don't like "equivalents" when it comes to hot's and vertical ic's.


Thanks Minnie, that sounds about right when the Sony part costs three times as much:)
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minnie



Joined: 18 Aug 2005
Posts: 2877
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PostPosted: Sun Nov 26, 2006 9:48 pm    Post subject: Reply with quote

You got it! Sony O.E. or it doesn't work! Unless you sub an RCA HOT to Sony. Only exception I know of that works (2sc5148.)
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PostPosted: Sun Nov 26, 2006 9:53 pm    Post subject: Reply with quote

minnie wrote:
You got it! Sony O.E. or it doesn't work! Unless you sub an RCA HOT to Sony. Only exception I know of that works (2sc5148.)



Oh well, so much for trying to keep the costs down Very Happy The transistor 2sc5251 is supposed to be an original part but the lopt was an alternative

Cheers,
Leo
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