ZBeeblebrox
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Apr 24, 2008, 1:16 PM
Post #1 of 1
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LXI Rear Projection Convergence ICs (Magnavox PTV340)
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I am trying to fix this LXI 626.54471950 RPTV I aquired. The set is 19 years old and had/has some issues. First, I evicted the algae in the Blue and Green CRTs and replaced the fluid in all three guns (with the help of info I gleaned from reading the boards). I've got the picture pretty well cleaned up, but I'm still having an issue in the upper left corner of the screen, where the convergence is way off. I'm looking at the Convergence Power Board (A10365-B002) and can't seem to find any info on the ICs. I see 8 ICs listed on the board (2 x 612479-4 & 6 x NE5534P), but from what I've been reading, the ICs should be connected to big heatsinks. This board has three large heatsinks with 4 components on each one (2 x 421-8/R918 & 2 x 421-7/925). I can't find any info on these components in any of my searching. They appear to have the Motorola "M" logo on them and the ones with the 925 on them have "502920" on the top near the metal mounting tab. So, I'm left with the following questions: 1)Does the convergence issue sound like changing the ICs would fix it? 2)Which of the ICs should I be replacing? 3)Does anyone know the equivalent part numbers to replace them with? Any help would be greatly appreciated.
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