Re: Gorf RGB Conversion Board Repair

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Is the sync generated on that board? I though it just passed through. You
might have a bad connection and as I recall the game generated separate
sync signals for the monitor.

John :-#)#

At 06:44 PM 12/15/01 -0800, you wrote:
>Didn't get any responses to this so I'm resending hoping someone could shed
>some light on this board. Any help would be greatly appreciated....
>Thanks again.
>
>
>
>Hello !
>
>I've got a working Gorf game. The only problem is I can't seem to lock in
>the vertical sync - the monitor rolls vertically. - Picture available if
>necessary -
>
>I've replaced the Gorf PCB set with a tested/known working PCB set and
>replaced the monitor chassis (G07) with a known working one so I assume the
>problem is on the small RGB conversion board. What is the story with these
>boards ?
>
>
>1. What commonly fails on them ?
>
>2. There is a single chip on the board TBA530 - are these available
>anywhere ?
>
>3. Is there anywhere else I should be looking for the cause of this problem ?
>
>4. Is there anyway to bypass/remove this board from the system completely ?
> If so, what mods need to be done ?
>
>
>
>I've already tried replacing Q1 the 2N4401 transistor and CR1 the 1N5232B
>diode
>but no change.
>
>Thanks for any information or suggestions you might have ....
>
>
>Steve Winslow
>
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Received on Sat Dec 15 23:34:53 2001