megatouch maxx monitor Issue

[screenie]

Hi newbie to forum i got a problem monitor wises i think

i got a megatouch maxx sapphire edition, a problem has popped up when i finishedplaying on the machine i switched it off has i
had to pop out and when i came back and switched the machine back on my screen went all fizzy i guess. after a while you can see the
the colours and it like lines on the screen, but there is a panel in the back which allows me to turn the v hold h hold size brightness etc once i mess
arround turning them the picture come back and i can tune it back to normal, but i notice menu is still but now when on a game it jumps side to side in a way and when restarting the manchine again i got to repeat the same again, i have tried my lcd monitor for my pc on it and it displays prefect! but i hope some 1 can point me in the right direction, if it a stupid thing that might of came lose or so

thanks

[screenie]

I have attached pictures what the happens when i switch the machine on, the panel to tune the monitor.

[screenie]

and this the what it is like after tuning the monitor using the blue wheels on the panel

and i cant understand why it has gone like this as it's never done i before , thanks for looking.

[knagl]

Welcome to New Life Games, screenie.   

I'm not a monitor expert, but I would guess based on your pictures (thank you for posting them, by the way -- it makes troubleshooting so much easier) that you have an issue with the potentiometer (aka "pot") (adjustment wheel) that controls the Horizontal Hold for your monitor.

If the issue was with the vertical hold, the picture would be scrolling up (or down) repeatedly.  The horizontal hold locks the image from scrolling to the left (or right) repeatedly.  Based on the picture you posted, and your description (that the menu jumps from side to side), the horizontal hold is not set correctly, or is not maintaining its setting.

Over time, potentiometers tend to get dirty and not make a good contact internally, which will cause intermittent problems.  The first and simplest thing you can try is to simply rotate the H Hold pot all the way back and forth a number of times.  This can help to clean off the internal contacts and hopefully make a better contact.  Once you've moved it back and forth a number of times, adjust it so that it is in the middle of the area where the screen appears to be stable (that is, not moving side to side).  You should notice that on the edge of that stable area, it will start moving to the right if you move the pot one way, and to the left if you move it the other way.  Try and find the center of the stable zone, and be willing to adjust it a hair one way or the other to compensate for potential screen shifts as the screen image changes.  (That is, if you switch from the menu to a game and the screen appears to start drifting to the right, adjust the dial just a hair in the opposite direction to find the sweet spot where the screen will stay locked even when the image changes.)

You may also need to eventually (or even now, depending on how bad it is) replace the pot, or replace the monitor control board (you should be able to simply buy a new board, and with the power off disconnect the wire harnesses going to the old control board and connect the new one) to resolve the issue.  Start with my suggestion above, though, and let us know if you're able to get the issue resolved, or at least better.

Also, beware that CRT monitors carry VERY high voltage (potentially deadly, even when turned off and unplugged).  Do not mess with any of the wiring that is connected to the monitor, and keep a healthy distance from all of the components that are attached to or directly related to the monitor.  Based on your monitor experience from your question, the only adjustments you should attempt at this time are with the pots (dials) on that control board.  Again, keep your distance from any other components of the monitor.   

[screenie]

thanks for the reply i have tried the suggestions you gave me to try but still nothing
i trieda lcd pc monitor on the board and it works brillant, but is possible to replace mointor
with a pc one if the touch can be moved over to the other mointor.

[knagl]

I'm sure there are LCD touchscreens that use a compatible touchscreen controller, but I'm not familiar enough with the platform to be able to give you further help.  Hopefully someone else will chime in here.

A cheaper solution would be to buy a replacement monitor control board (the thing with the adjustment dials), as I think that'll resolve your issue (I can't promise that, though).

[screenie]

i will try that then thanks for helping me out, A+

[knagl]

Hey there, monitor gurus.

I was hoping that someone more familiar with monitors than me can help another member out in a different thread.  He has a Megatouch bartop touchscreen game that appears (to me) to have an issue with the horizontal hold, but if he tweaks with the pots on the monitor control board, he's able to get it working correctly again (for a short time).  Could you guys take a look at his thread and either confirm what I've told him, or perhaps be able to offer him some better ideas?

Circular link removed.

Thanks!





Moderator: Removed link, since it now points back to this thread. SF

[knagl]

Hang on for a day or so before you go and buy anything -- I just posted a message in the monitor help forum asking some folks to take a look at this thread to see if they can offer you some advice.

[StatFreak]

Knalg, that's a good idea. I moved the thread to this board and merged it with this one, since screenie's issue is more a monitor problem than a Megatouch problem.


Stat
  Global Moderator

[knagl]

Knalg, that's a good idea.

Thanks, Stta.   

[Firebird]

Sounds to me like the problem may be a bad capacitor on the board, or the IC that controls the horizontal and vertical sync. I am not ruling out the remote board but a test with a DMM will verify if the pot is working properly. His best bet is to take the monitor to a shop and have it looked at.

[screenie]

hi all, thanks you all for your advise, i managed to fix it in the end. I was looking at the board below the mointor not to sure what it called and noticed 3 white pot wheels, 1 was labeled h-post and the other was v - pos, the last one was just labelled Adj and has 3 digits starting with r***, anyway after turn this wheel a hair at a time, my screen became more stable. after playing a few games. i switched machine off and back on and the screen is back to normal.

Again thank you all for your advise A+ to you all    

[StatFreak]

Thanks for letting us know that you got it working.     

[knagl]

Great news.  Congrats on getting your game working well again.

You may want/need to re-calibrate the touchscreen since the monitor image has likely moved.  Calibrating the touchscreen teaches the touchscreen where the monitor image is compared to where you touch on the screen, and will make your touches to the screen more accurate.  To recalibrate the screen, press the service button inside the cabinet and find the 'calibrate touchscreen' option in the service menu, then following the directions on the screen to calibrate.