Re: Star Wars 25 inch Amplifone issue

Check the easy stuff.

Take a look at the focus block on the HV board. For some reason we frequently see focus and or screen connections only held on by the boot. It's easy enough to pull the boots back and see if the wire comes with it.

Probably less than 50% probably, but it's higher than you'd imagine.

Hope that helps.

-Mark

On Sep 11, 2013, at 6:09 PM, Ken Sumrall <k_lists@scrapheap.net> wrote:

> The monitor on our Star Wars sit down machine at work is having issues. It started with an intermittent issue where the screen would suddenly turn green, and it was very bright and all the retrace lines were showing, and all the lines were out of focus. Smacking the cabinet would sometimes bring back a good picture. Then we also lost vertical deflection, so we opened it up to take a look.
>
> The deflection issue was easy to fix. We replaced a few transistors, and a fuse, and it was working again. The other issue we're still struggling with, in fact it's much worse, and is mostly in the bad state, with occasional flickers of it working correctly.
>
> We initially thought it was a bad connection in the CRT socket, as it seemed to change as I was poking the socket with a wooden stick. So I replaced the CRT socket harness with a spare one I had. That didn't work. So poked some more, and started to think there was a loose connection in the focus block. But then poking further didn't do anything.
>
> So, we started to suspect that something is just randomly working for short moments, and whatever I was poking when that happened made me think that was the issue.
>
> We are now wondering if maybe the green drive transistor is shorted on? That would explain everything looking green, and the retrace lines, and the brightness. Would that also explain the poor focus?
>
> Any other suggestions?
>
> Thanks!
>
> ___
> Ken
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Received on Wed Sep 11 20:38:25 2013