BL27CB0P/ M2929DC-62 Neogeo problem

[Atomiswave]

I have recetly got this monitor which is overall a very nice monitor accordning to me and other reviewers. But it seems to have problem to display some 15 khz games correctly, which in my case is from a Neogeo motherboard according to the pictures I have taken. I believe this could be some odd sync problem, but since this is a digital monitor plus I cannot adjust the sync rates manually. I believe I have to get access to a factory menu. Please tell me if you know the key combination to access it.

http://hem.bredband.net/b260837/monitor/monitor1.jpg

http://hem.bredband.net/b260837/monitor/monitor2.jpg

[Atomiswave]

Anyone else with similar issue?

[grantspain]

what monitor is it,alot of digital monitors you can access extended setup by holding down the select or menu button on power up,although it does look like a freq type issue have you tried adjusting the horizontal hold

[Atomiswave]

I cannot gain access to such features through the menu

Thats why I ask how to gain access to the factory menu.

[Kevin Mullins]

Defineately appears to be a sync issue . . . . but not far off considering how much picture you do have.
I couldn't seem to find the actual manual on this monitor, but it looks like there should be some OSD (On Screen Display) menus available to you. Look for anything that may say "phase" or "clock" I would assume. (maybe, just guessing)
Also double check your video input or sync input.


http://www.weiya.com.tw/products_detail.asp?le=english&fid=95&pid=104&top_fid=86


OSD CONTROL:

BRIGHTNESS, CONTRAST, VERT/HORI SIZE, VERT/HORI POSITION, PINCUSHION,
TRAPEZOID, BOW, PARALLEL, COLOR TEMP, RGB ADJ, ROTATION, LANGUAGE, RECALL,
DEGAUSS

DIGITAL (buttons) CONTROLS:

POWER SWITCH,CONTRAST,BRIGHTNESS,H-SIZE,V-SIZE,H-CENTER,V-CENTER,V-HOLD,
ROTATION

If all else fails check the chassis itself for controls.
(horizontal hold doesn't seem listed in the OSD menu)

[Atomiswave]

Yes, I have OSD indeed and I cannot get access even to V-hold    Sure I cannot expect NANAO quality, but this issue is not acceptable. I also have a very simple and thin manual and there is no H-hold or V-hold listed at all. I definately hope it should be adjustable, otherwise this monitor should not be sold if it cannot handle these simple basic tasks. And the "you get what you pay for" sentence is not a valid point either. Well, I currently wait for a reply from Wei Ya. I will post here on the boards as soon as I get a solution of this issue.

[MonMotha]

My Betson/Kortek does that on some signals (Playstation style devices such as a PS2 and Konami s573 appear to be the baddies) when using composite sync, only it looks even worse (the fields start to visibly tear apart in the area where your picture is distorted near the top).  Feeding it separate sync in those cases fixes the issue.  Oddly enough, my monitor is fine with other standard res signals using composite sync (TMNT shows up nicely).

[Atomiswave]

I tried to combine the V-sync from the 6-pin connector together with H-sync (C-sync), but the monitor lits off as long as I combine that wire. So no go there   I have hard to accept to live with this. Overall I think this monitor is nice, but the linearity in the left and right edges could be fixed a bit better in my opinion. Perhaps I could gain access to these controls if I am lucky.

[MonMotha]

Hooking up composite sync to both inputs is not the same as separate sync.  Unfortunately, separating syncs requires a bit of ingenuity (it involves integrators with adjusted time constants to do it with analog stuff, or you can use a small microcontroller with timers and do it digitally) if you don't have one of the components already available.  Hooking csync up to both inputs on my monitor doesn't fix the problem: you have to actually feed it real separate sync to clear up the issue.  I really kinda wish I knew why it was doing that, as it only does it on certain inputs.

[Atomiswave]

So you believe I may have to split those syncs and just let some of my games to output just H-sync? There are plenty of sites with good documentations how to build such circuit what I have seen.

[MonMotha]

I can say that feeding my Kortek actual separate sync (H and V, both negative going polarity) rather than composite sync (hooked up in any way conceivable) fixed the issue.  I'm using an LM1881 to rip the sync off the composite video line (and the component output is set to RGB), which outputs composite sync and vertical sync.  You can then invert the vertical sync and XOR it with composite sync to get horizontal sync (this is easily accomplished with a 7486).  Made my monitor happy, dunno what to tell you otherwise.

There are various ways to separate composite sync back out into separate horizontal and vertical, some better than others.  Being a digital guy, I'm prone to just throwing tiny microcontrollers at everything, but old-school methods work just fine, too.

[Kevin Mullins]

Have you thought about trying something like this ?  (just an idea, maybe)

http://users.rcn.com/jenison/mars/trouble/part/monitors/boost.html

[MonMotha]

I checked the levels on a scope, both my composite sync (that didn't work right) and the separate sync I created were at TTL levels (and pretty clean ones at that), so I doubt that's the problem in my case.  For other people, dunno what to say.

[Kevin Mullins]

Hmmm . . . perplexing indeed.

Just to take a step backwards for a minute . . .

Which NeoGeo motherboard are you using?
(model and serial)

Have you tried it on any other monitors?
(standard no frills 15khz type)

Have you tried any different game carts on the new monitor setup?

Bear with me, I'm an old schooler.

[Kevin Mullins]

Just reading through some review stuff - http://www.retroblast.com/reviews/weiya.html
(no immediate help to ya though)

Did you contact Wei-Ya OR bilLABS ?

bilLABS is here in the US - http://www.billabs.com/contacts.htm

I've had trouble contacting Wei-Ya themselves with my older monitor stuff. (no answer)