Re: Star Wars 25 inch Amplifone issue

Heater-cathode short in CRT green gun? Don't suppose you have a CRT tester?
On Sep 11, 2013 6:10 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 19:18:55 2013