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Convergence problem in 1080i ONLY - Panasonic RPTV

 
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Jarek



Joined: 20 Oct 2006
Posts: 5

PostPosted: Fri Oct 20, 2006 5:30 pm    Post subject: Convergence problem in 1080i ONLY - Panasonic RPTV Reply with quote

I have an older Panny rptv PT47wx53. One day the convergence on the hd 1080i channels broke, basically all four sides of the picture are bent "in" towards the middle and the three gun colours are way off.
Me and a friend replaced the convergence IC's, STK392-110 and inspected, tested and resoldered the IC resistors. The board itself looks ok too. There was no change once we replaced the board. The 1080i picture is still bad, the 480i and 480p are fine.

Any suggestions on what else might have broken and how we can test and replace it?

Thank you for any suggestions.

Jarek
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Jarek



Joined: 20 Oct 2006
Posts: 5

PostPosted: Tue Oct 24, 2006 3:25 am    Post subject: Reply with quote

Upski. Smile
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minnie



Joined: 18 Aug 2005
Posts: 2877
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PostPosted: Sat Oct 28, 2006 10:53 pm    Post subject: Reply with quote

Did you go into the service menu and adjust the convergence in the 1080i mode?
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Jarek



Joined: 20 Oct 2006
Posts: 5

PostPosted: Sun Oct 29, 2006 12:31 am    Post subject: Reply with quote

Yes, trust me regular adjustment is not the problem, the guns/convergence is really off, the bottom right crosshair cannot be overlapped.
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minnie



Joined: 18 Aug 2005
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PostPosted: Sun Oct 29, 2006 9:19 pm    Post subject: Reply with quote

The DCU/convergence generator stores the information. If 480 is good and 1080 is bad, I would suspect a bad dcu.
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Jarek



Joined: 20 Oct 2006
Posts: 5

PostPosted: Mon Oct 30, 2006 5:16 pm    Post subject: Reply with quote

Thanks, I'll try to test/change that and see what happens. Smile
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Jarek



Joined: 20 Oct 2006
Posts: 5

PostPosted: Mon Oct 30, 2006 5:26 pm    Post subject: Reply with quote

Sorry, I can't edit my previous post.

Is the DCU genertor a stand alone part or is it a chip on one of the boards? I have the service manual for the TV but it's missing the schematics and nowhere in the manual does it mention the DCU. Question
Thank you.
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minnie



Joined: 18 Aug 2005
Posts: 2877
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PostPosted: Wed Nov 01, 2006 1:09 am    Post subject: Reply with quote

Should be on the signal board as a stand up.
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