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Aiwa Tv , horizontal Line on center

 
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Teddy
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PostPosted: Sat Feb 14, 2009 9:48 am    Post subject: Aiwa Tv , horizontal Line on center Reply with quote

I have Aiwa tv Model Tv-C202SKE it's having horizontal line on center nothing else & i changed the vertical IC LA7830 & 2 caps around it ( 50V-100uf & 50V- 1uf ) but still there's no change only Horizontal line. there's 25v input to the Ver.Ic but no output even when i changed the IC the same thing, so hlep me plz what could be the possible problem.
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jts1957



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PostPosted: Sat Feb 14, 2009 10:08 am    Post subject: Reply with quote

Pin 6 is VCC = 18 to 26 volts?
Pin 4 is the input of the vertical IC and should NOT be 25v!

http://www.datasheetcatalog.com/datasheets_pdf/L/A/7/8/LA7830.shtml
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PostPosted: Sat Feb 14, 2009 6:29 pm    Post subject: Reply with quote

am getting 25v on pin 6 (Vcc ) but am also getting 25v on pin 2 (output)
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PostPosted: Thu Feb 26, 2009 8:38 pm    Post subject: Reply with quote

am getting 25v on pin 6 (Vcc ) but am also getting 25v on pin 2 (output) , & how can this happend, I mean 25v on the input & output ? so regarding with all the symptoms i have told u , tell me what couold be the possible faults, waiting for ur reply, thanks !!
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jts1957



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PostPosted: Fri Feb 27, 2009 4:34 am    Post subject: Reply with quote

Does the IC have correct "signal"/"waveform" at its input (Pin #4)?
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Westly_gulay



Joined: 04 Mar 2009
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PostPosted: Wed Mar 04, 2009 2:14 am    Post subject: Reply with quote

I have some expiriance in other model you may have check the 100pf ceramics in vertical section
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Im from bulacan philippines im tv technician at 8years
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PostPosted: Thu Mar 19, 2009 5:34 pm    Post subject: Reply with quote

the tv is still like that no change soplz can u gime any ideas with that, there's a faint white with blue thin horizontal line on the middle screen nothing else,
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jts1957



Joined: 24 Nov 2008
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PostPosted: Thu Mar 19, 2009 10:42 pm    Post subject: Reply with quote

If you have access to "Sams Photofacts," their cross reference lists the following as using "LA7830":

4272 / 4241 / 4642 / 4275 / 4337 / 4353 / 4364 / 4374 / 4137

The above schematics may be of help, even though they aren't "Aiwa."
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PostPosted: Fri Mar 20, 2009 2:47 am    Post subject: WRATH Reply with quote

Flyback feeds the primary voltage.
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