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Mitsubishi WS-65807 65 in. Rear Projection Television
Problem for Mitsubishi WS-65807 65 in. Rear Projection Television

Ws-65807 convergence problem to blowing F9A05 everytime




By fillmore85 on Oct 16, 2009

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I'm working on a ws-65807 that had a convergence problem, but is now blowing fuse. I originally just changed the IC's because of a convergence issue, but now the tv won't come on. The fuse is F9A05 and when I check for a code I get 2-2 or short protect. What should I be looking for that would cause this fuse to blow? The fuse is located on the power board where most Mitsubishi fuses are. I have never had bad IC's from the start, but might that be the case here?

The green light on the tv would blink 3 times and the tv would turn on, but turn right back off. I replaced fuses F9A05 and F9A04 and seemed to fix the problem. Then I turned the tv off to put everything back together and it wouldn't turn on after that. So before I left the plan was to replace the fuse and not turn the tv off, but that only lasted 5 minutes.

F9A05 is connected to diode D9A61 (where I think I should be seeing -24v, but don't know how to check that unless you need to test the tv under load) and pin 22 of power transformer T9A50.

Please help me if you know what the problem is.
Comments:

Nov 03, 2009

- Yep. At least one of the Convergence IC's was bad, so I sent them both back for new ones. I finally got a bad new IC.

Nov 06, 2009

- The tv works perfectly again, now that the bad IC's were replaced with good ones.

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