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horizontal problem in Vestel tv 11ak30

 
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thefixer
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PostPosted: Sat Jul 11, 2009 8:34 pm    Post subject: horizontal problem in Vestel tv 11ak30 Reply with quote

i have vestel tv chasis 11ak30 ,it has processor st92195c3b1,and stv2246h .The problem is no hOriz.signal in flyback even though i ,switch it on by using remote ,and led is green .Bu808df is ok ,116 is ok.i replaced stv 2246h but in vain.what are other possibilties.... any one to guide me .thanks in advance.
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rajeev4u
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PostPosted: Fri Jul 31, 2009 8:20 am    Post subject: Re: horizontal problem in Vestel tv 11ak30 Reply with quote

thefixer wrote:
i have vestel tv chasis 11ak30 ,it has processor st92195c3b1,and stv2246h .The problem is no hOriz.signal in flyback even though i ,switch it on by using remote ,and led is green .Bu808df is ok ,116 is ok.i replaced stv 2246h but in vain.what are other possibilties.... any one to guide me .thanks in advance.


first check voltage on the base of horizontal driver transistor,it may be open try replacing ir, secondly check +110v on horizontal transitor.
then reply

rajeev kumar
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thefixer
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PostPosted: Sun Aug 02, 2009 1:13 pm    Post subject: no h in vestel Reply with quote

the voltage is normal in transistor collector that is 115 v .
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jts1957



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PostPosted: Sun Aug 02, 2009 1:52 pm    Post subject: Reply with quote

Scope for Base drive.
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thefixer
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PostPosted: Tue Aug 04, 2009 9:28 am    Post subject: no horiz. investel tv Reply with quote

110 v is normal .transistor bu 808 is ok.i scope signal is normal when disconnecting output of stv2246 h from the rest of horizontal part.but when scoping with thesource of horiz signal connected i can have 7.5 v *it is not normal* .FINALLY I FOUND THAT ONE OF CAPACITOR NEAR BU808 DFI IS OPEN *NOT SHORTED*0.0nf C619 250V 100 nf.now tv set is ok Very Happy
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