Vertical hold issue on 27” Neotech monitor from a Golden Tee

[mclovin]

I am attempting to repair a Golden Tee machine with a Neotech monitor, there was multiple issues with this machine including a major horizontal issue with the monitor. So I replaced quite a few Caps put it back together and all looks great. Then I was having issues from what appeared to be the video card, so I replaced that. Now I have a perfect picture but every time I restart the machine It goes to a vertical split or rolling screen( see attached pic). Then I carefully adjust the vertical hold in the control panel to get it to a full screen again which is difficult and touchy to get hit right. All seems well again until  I unplug and restart, then it goes back to the same thing in a different position or rolling screen.  Has anyone seen a vertical hold issue like this before?

I am a newbie with very limited knowledge so try and bare with me. Thanks in advance!

[ed12]

ya
it is not substaining its vertical lock (sync)
did u replace the bi-polar output cap 10-50mf/50v ?
I forget the true value
that has a lot to do with vert feed back
do u have the schematic ?

ed

[mclovin]

I replaced a bad 10uf 50v bipolar cap at C550 that was shot. But the monitor didn’t do the vertical hold issue before. So I don’t think that cap is related.

[ed12]

oh it is
feedback ..
try putting 20-50 in place of the 10

ed

[mclovin]

I don’t have any BPs left. I’ll try to pick some up. Could the change in video card do this?

[ed12]

50/50
I am leaning towards monitor
but best way is lcd (u should know this 1) (wink wink)

ed

[Mike A]

This is a noob suggestion. I just had this exact problem. The vertical hold was really touchy, and would never lock in. The sync cable was plugged into the +H sync pin. I moved it to the -H sync pin and the picture locked right in.

I am new to this so that is probably pretty obvious, but it is worth mentioning.

[mclovin]

I am a noob... where would I find the -h Sync pin?

[Mike A]

Mine was originally plugged into the red underlined pin. I moved it to the blue pin and the picture snapped right into place. Different monitors are probably different. You would have to look up the manual.

[mclovin]

Really strange it would appear to be the video card. I borrowed another one and it works fine. I know this card worked fine in another board. Either way hope this helps someone else in the future.