Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: kyle1111 on July 09, 2009, 11:31:16 pm
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Hi Guys, I'm having a vertical deflection problem with a pentranic cga only chassis. At first I was getting just a straight horizontal line across the screen. I checked all electrolytic caps and changed out any with high ESR readings. It did nothing to fix the problem.
I then tried changing out IC3(AN5521), which again did not fix the problem. I investigated further and and found R336 and D401 to both be bad, so I replaced them. I was then getting an image that was about half the height it should be and distorted, very similar to ARM123 post on his 1432 chassis (Re: Pentranic 1432 display issues [UPDATE]). It was very similar to his picture but without white bar in the center. I smelled something burning and shut off the monitor before I could get a pic. It turned out to be R336 (4.3 ohm) again.
I'm guessing either I have to change out IC3 again, as when I put it in both R336 and D401 were bad. Or maybe the flyback is bad and needs to be replaced.
An suggestions would be greatly appreciated.
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Well I fixed it! I replaced R336 again and IC3 which I stole off a project chassis I bought off ebay turned it on and it works fine.
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well done,sounds like the ic Vcc was going to high and blowing the chip