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hitachi 57twx20b convergence problem

 
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lofixxit
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PostPosted: Sun Aug 16, 2009 11:13 am    Post subject: hitachi 57twx20b convergence problem Reply with quote

I got this tv from my boss. he replaced the stk's with some cheap ass($5) ones and made the problem worse(only green was bad, now all colors bad). I replaced them again with new 160e's. I checked all pico-fuses too.
When I go into DCAM, everything works but the colors are bowtied and I can't move any of them. Any suggestions? I'm stumped on this one. I have repaired many hitachi's and am pretty familiar with them. Help!
Jim
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Sun Aug 16, 2009 7:53 pm    Post subject: Reply with quote

Any bias resistors bad?
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lofixxit
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PostPosted: Mon Aug 17, 2009 11:47 pm    Post subject: hitachi convergence Reply with quote

If you mean the return resistors next to the stk's, no. They are all good and look brand new. I'm thinking maybe the stk's aren't getting their +(-) operating voltages. It acts like the stks aren't working. Is there a voltage regulator that creates the stk voltages? I think it's +(-)24V.
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jts1957



Joined: 24 Nov 2008
Posts: 2472
Location: Far, Far Away

PostPosted: Mon Aug 17, 2009 11:52 pm    Post subject: Reply with quote

Pull up the datasheet on the stk and check the +/- VCC pins?
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lofixxit
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PostPosted: Tue Aug 18, 2009 1:31 am    Post subject: hitachi convergence Reply with quote

My thoughts exactly, I found a datasheet for stk392-110.I think they are the same pinout.According to that it's pins 4&5 for + and - vcc. I'm gonna check that out tomorrow.
I pulled power and def boards out and checked all pico's again and rechecked my solder connections with the meter on contin. everything there checks good. hmmm.... Hey thanks alot for responding and helping me. I really want this tv to work, my old sony's blue and red tubes are going. This tv was in my boss' bedroom and doesn't have many hours on it. Thanks again.
Jim
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Tue Aug 18, 2009 11:14 pm    Post subject: Reply with quote

Resister so I can send you a pdf for troubleshooting.
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lofixxit



Joined: 18 Aug 2009
Posts: 1

PostPosted: Tue Aug 18, 2009 11:51 pm    Post subject: hitachi convergence Reply with quote

ok, I registered. Thank you for your help.
Jim
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plcnut



Joined: 18 Aug 2009
Posts: 6
Location: Missouri, U.S.A.

PostPosted: Wed Aug 19, 2009 5:19 am    Post subject: Reply with quote

here is a data sheet for the stk392-110/stk392-150 equivalent built by NTE: http://www.nteinc.com/specs/7100to7199/pdf/nte7178_81.pdf It should be enough to at least get your pinouts and voltage ratings. Regards, Jason
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