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Toshiba 50H72 Convergence

 
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cmartin



Joined: 13 Nov 2006
Posts: 6

PostPosted: Mon Nov 13, 2006 3:08 pm    Post subject: Toshiba 50H72 Convergence Reply with quote

I have a Toshiba 50H72 that has a convergence problem. The Blue looks stretched and bent (octave) and the red looks compressed, these are both compared to the green. I replace the STK392 with Sanyo (according to the vendor). The problem still exists. Can someone tell me the location (R???) of the power resistors and mocro fuses?
Thanks,
Clay
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Tue Nov 14, 2006 12:40 am    Post subject: Reply with quote

Check the resistors by the ic's, should be 2.2 ohms. Under the heat sink.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Tue Nov 14, 2006 12:50 am    Post subject: Reply with quote

Just red the ones around it to make sure. 2 watts.
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cmartin



Joined: 13 Nov 2006
Posts: 6

PostPosted: Tue Nov 14, 2006 6:37 pm    Post subject: Toshiba Convergence Follow Up Reply with quote

Thanks for the replies. I found that R7716 (1.8 Ohm 1W, fusible resistor) is open. This resistor is in the Blue Vertical part of the ciruit. I have ordered the part along with more STK392's. I don't know if this resistor is causing all of the problems I am seeing, but I will find out in a day or two. I ordered the extra 392's just in case the ones I installed ealier were defective.
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minnie



Joined: 18 Aug 2005
Posts: 2877
Location: Hell

PostPosted: Wed Nov 15, 2006 12:10 am    Post subject: Reply with quote

PM'd you back, read my post on convergence ic's. That's why they were doa!
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