WG 25K7193

[coliveira]

Hello

I've received some very helpful advice in the past with this monitor and I'm hoping that your kindness will carry me through again.  Lately, the screen of my nephews' mame cabinet seems to be flickering/jumping around.  Not really sure of a better way to describe it.  I can definitely tell you that it hadn't been doing that prior so I don't think it has anything to do with the computer configuration, resolution, etc.

I did have to do some soldering for the red pin on the chassis when red was cutting in and out.  Is it possible that the same is true with the -h sync here?  Not sure if it would cause it to jump around a little or if it would just go crazy if there was a solder problem.  It does seem that toying with the wire connecting with the pin on the chassis can cause it to change a bit or fix it temporarily, but I don't know if it's coincidence. 

Before I ran off pretending like I knew what I was doing I wanted to run this by you guys first.  No sense in soldering something if it's not going to help.  Plus, my soldering 'skills' aren't very good and I'd be more worried I'd mess something up than actually fix something.

Additionally, and I realize this isn't a monitor issue, the joystick freaked out and started going 'right' all of the time.  The buttons quit working too.  Can't imagine the two are related, but I thought I'd run that by just in case they are.  Anyway, I'm off to start another post to fix that problem (unless you have some advice on that too).

Thanks
Chris

[coliveira]

I thought it might help if I posted a link to what the monitor actually looks like.  It may look like shaky camera work, but if you look closely (especially comparing the bottom of the picture to the bezel) you can see that the screen is jumping around a bit.  I'd love it if anyone could lead me in the right direction...



Any help is appreciated.

Thanks
Chris

[Nephasth]

I have this same exact issue with a 19" WG using an ArcadeVGA (very hard to capture on video). The monitor never did it before I had it hooked up to the ArcadeVGA. I've tried adjusting V Hold and H Hold, along with other pots and it never got better. Ran across this thread early in my digging to try to find the solution.

[coliveira]

I still have no solution for it.  I haven't tried pulling the chassis and looking at the pin, but I really doubt that's it. 

I've had a couple of other projects that have been taking my time so I was hoping a solution would pop up here in the meantime.  It looks like it's a stumper of a problem though.

Please let me know if you come across anything and I'll do the same.  I'm beginning to wonder if it has anything to do with "warming up" as it seems to occur after a bit of playing.  I'm going to keep my eye on that to see if I notice a trend as I may be imagining that.

Thanks
Chris

[coliveira]

I listened to part of a Arcade Repair webcast and someone mentioned a similar problem.  They seemed to think it had either more to do with the electrical load, poor ground, or soldering.  I've only tried it once, but I turned out all lights in the garage and there was no flicker.

Hopefully that's the solution and this is helpful to any with this problem in the future...

[Nephasth]

Well, I know it's not a solder issue with mine, because the monitor is perfect when hooked up to an arcade pcb. For mine, I'm 95% sure it's getting a good signal ground, I have tried 3 different VGA breakout cables all with the same result. I've been  leaning towards this being a voltage issue. Although WGs can accept a signal voltage of 1-5V, I think the ArcadeVGA's 1V signal may be right on that threshold for my monitor. I will most likely be getting a video amp to see if it remedies my issue.

[coliveira]

Interesting.  Please update this thread with your results.  My garage isn't the final destination for this machine.  I'm waiting for my brother's game room to be completed so that I can give it to my nephews.  I'm curious and hesitant that the problem will persist in the new location so I'd love to get all of the information that I can on the issue in case it does.

Here's the podcast that I listened to.  http://www.arcaderepairtips.com/2011/05/01/qa-podcast-episode-24/

I wish I could remember where it was specifically in the podcast, but if I remember correctly the podcast description is in the same order as the podcast itself so that should help you narrow it down if you're interested in listening to it.

Thanks and good luck.

Chris

[Kevin Mullins]

Just curious -
Have these chassis been re-capped recently?
Have you played around with different refresh rates while in Windows, like say 60Hz ?

I don't mess with the MAME stuff much, so may be of no real help here.

[coliveira]

I have not.  I am such a noob with this stuff that I'm very afraid of making things worse by messing with it.  It's funny, but I'm scared to death at the thought of doing a cap kit even though everyone talks about how easy it is.  I know that thing would never turn back on once I got done with it!

Plus, this worked so well for so long without problems, that it really had me spinning for answers as to what had changed.

The electricity issue makes sense to me because it's been in a few locations in/around my house for me to work on and have fun with.  In retrospect it seems likely that the electrical might be an issue.

Location 1 - Worked great with original electrical wiring.

Location 2 - Worked great with original wiring and updated wiring (I put the power strip in the machine so only one wire would exit the back of it and all the changes that would include.  I put a very long cord on it at this point as I'm not sure how far it will be from an outlet in my brother's game room).  Worth mentioning that nobody is ever in this part of the house and the video game was essentially the only load on the electric.

Location 3 - Worked fairly well, but began to notice the occasional flicker.  Worth mentioning that this is a very active part of my house electricity wise.

Back to Location 1 - Still noticing occasional flicker.  However, has worked nicely 3 times now with all lights in the area off.  This is my garage so it's also a fairly active part of the house electricity wise.  I have no idea if a washing machine, dryer, etc. has been running while I've been getting the flicker.  I suppose my next move is to load up the electricity and turn it on to try to produce the flicker...

Thanks for all of your thoughts.
Chris

[coliveira]

Oh yeah.  I also never even considered anything about the refresh rates because it used to work perfectly.  It will be the first thing I check though if the electricity thing isn't the answer.  Please keep up on the thread because I'm sure I'll have plenty of questions if I have to pursue the problem that far!

Thanks again.
Chris