Slow Roller

[D-Lite]

Got a 5" Sony-branded PSOne screen and it works well when hooked up to most PCBs.  I managed to brighten up the image for some boards by shorting the 100 ohm resistors on the back as well.  So, many PCBs work.

Except for Neo Geo MVS.
:angry:

Which rolls ever so slowly.  It actually stopped rolling once, for like, 20 seconds.

I have an LM1881 in line and without it it's rollin' at record speeds.  But I want this bastard to play Neo because I have a neat little project lined up for said system.

Interestingly, I have an "Innovation" branded 5" PSOne compat LCD and it works perfectly with pretty much everything.  That thing even has a PAL/NTSC switch!

Help.

[NFG]

While I don't have a cure for you I can confirm that neo systems have crappy sync.  One of two 1084 monitors I had wouldn't sync with one MVS board I had, and neither would sync with the other.  

[D-Lite]

While I don't have a cure for you I can confirm that neo systems have crappy sync.  One of two 1084 monitors I had wouldn't sync with one MVS board I had, and neither would sync with the other.

Yeah, it's the same with all the MVS boards I've tried.  I'm pissed.

It's strange as I've never had a problem with MVS sync, usually other PCBs.

Interestingly, ESPrade also has sync issues.  But games as old as XMen and as new as Mr. Driller 2 are perfect.

??

[D-Lite]

OK, I found a work around.

The sync separator seems to have little effect so I removed it.  In jacking around with the sync signal, I went through several iterations of resistors, either in line or to ground the signal.  Seemed to help with ESPrade a bit, even though the image is curled at the top and behaves a bit "squirrelly".

Biggest concern was Neo Geo, so in working on that I decided to try to ground the sync using a capacitor.  Works!  Only 47 uF seemed to work, where 1 uF, 10 uF, 100 uF, and 220uf caps gave super fast rolling pics.  After having the 47 uF cap connected to the sync and ground for about 5-10 seconds, the image seems stable and the cap may be removed (require to play the Neo).