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lofixxit Guest
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Posted: Sun Aug 16, 2009 11:13 am Post subject: hitachi 57twx20b convergence problem |
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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: 2476 Location: Far, Far Away
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Posted: Sun Aug 16, 2009 7:53 pm Post subject: |
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Any bias resistors bad? |
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lofixxit Guest
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Posted: Mon Aug 17, 2009 11:47 pm Post subject: hitachi convergence |
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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: 2476 Location: Far, Far Away
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Posted: Mon Aug 17, 2009 11:52 pm Post subject: |
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Pull up the datasheet on the stk and check the +/- VCC pins? |
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lofixxit Guest
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Posted: Tue Aug 18, 2009 1:31 am Post subject: hitachi convergence |
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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: 2880 Location: Hell
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Posted: Tue Aug 18, 2009 11:14 pm Post subject: |
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Resister so I can send you a pdf for troubleshooting. |
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lofixxit
Joined: 18 Aug 2009 Posts: 1
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Posted: Tue Aug 18, 2009 11:51 pm Post subject: hitachi convergence |
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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.
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