Megatouch touchscreen issues...

keithsarcade

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Bought my wife a new toy today, an old Megatouch 4 Upright with a 19" touchscreen. Well it was working fine when we got it home (other than the monitor needs a cap kit), So when I moved it to its final destination in the arcade, the monitor was a rainbow of colors. I manually degaussed it and the colors are back where they were, but now I'm having issues with the touchscreen. It struggles to calibrate and keeps acting like its touching itself on the left side. Still playable, but acting screwy. Its difficult playing games when it keeps acting like I touched it on the left side when I didnt. Half the time, I try to recalibrate it and I get a "touch screen failed" message. Any advice? Bad touchscreen?

Also curious as to what I might be able to upgrade this to. Right now it has a working Megatouch 4 Tournament PCB (no hard drive), is there a good economical alternative I can slap into this thing without breaking the bank?
 

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Most of those touchscreen monitors derived the power for the touchscreen controller directly off the monitor chassis. See if yours is and measure the voltage going to the controller.
Beings you mentioned it looked like it needed capped, just curious if the voltage is low.

Also make sure the serial cable for the touchscreen is good going to the main board. (clean and secure)

And I think you can only upgrade that to like version 6 or 7...... maybe 8.
I can't find the page I was looking for to verify that though.
Honestly, IMO, there's not a whole lotta difference between any of those.

To upgrade to anything more current you will need to change the entire motherboard w/hard drive, etc, etc.
 
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The controller seems to go all the way to the power supply. What kind of reading am I looking for? The game is running on a switcher and I have it set to exactly 5.0v, maybe turn it up or down a little?

The monitor (WG72xx) does need a cap kit, badly. Looks clean but red is very dim and bleeds if I crank it up. Dont see a relation with the touchscreen though. Ive never worked on a Megatouch before. All cables look fine. The controller says Microtouch, and has a serial cable and then 2 wires (orange and white) for power.
 
Those controllers are generally 12v.... so check that coming off your switcher if that's what the controller power is tied into.
 
It's getting 11.7v. I can crank it up to 12v but that raises the 5v up as well, and then the game wont boot.

I noticed some of the hockey tape coming off on one side, so I removed what was "loose" and replaced as needed. Now the game wont boot at all unless I touch the screen in different places while its starting up. Cant calibrate anymore either. I get a "Touch Controller Failed" message every time (this same message also appears after a minute of trying to boot up). Grrrrr. Well the good news is that spot where it kept "touching itself" is gone now, but its still messed up. I really have to wonder if my controller and/or touchscreen is starting to crap out.
 
The touchscreen is probably fine, it is probably the touchscreen controller that is bad. I had a megatouch 5 a few years ago that I had to change the controller on. Can probably find one on ebay. I believe the box has a green led on it (it has been a while) the green led lights when the screen is sensing a touch.... so if it is lit and you are not touching the screen that indicates a bad controller. It is upgradeable to a 7, the next version is XL which is vga, yours is cga.
 
I believe the box has a green led on it (it has been a while) the green led lights when the screen is sensing a touch.... so if it is lit and you are not touching the screen that indicates a bad controller.

Should be lit indicating it has power and may flicker brighter when the screen is touched.
(I don't recall off the top of my head either)

From all that has been said I'm leaning towards a bad controller also.
There should be a Microtouch model number on the white casing somewhere.

Seems like I remember the older boards being a little finicky about which controller it used.
(i.e some of the newer ones wouldn't work correctly, could be wrong though)
 
Make sure the pretty cover isn't pressing on the touchscreen on the left side.

If the LED is bright then it thinks it's being touched. If you remove the cover from in front of the CRT and it works, check for the LED getting bright when you touch it and when you put the cover over the front of the CRT.

RJ
 
Well today its working just fine. Keeping my fingers crossed and hoping the issue dosent come back. I wrote down info from the controller so if it acts up again, I at least know what I need.

Anyone have a 6 or 7 PCB laying around? Or can I put different chips in mine? This one looks to be running 4 and it only has 13 games. I've heard 6 on up has about twice as many games on it. Wouldnt mind an upgrade if the price is right.
 
Check the ground wire coming off the touchscreen. Make sure it's cranked SUPER tight. Replace the power cord. Make sure that the outlet is properly grounded. Use a NEW power cord.

D.C.
 
Dave beat me to it. I was having all king of problems with my touchscreen at my bar. The advice I kept getting was check to see if the outlet is properly grounded. After taking apart, inspecting, cleaning, and reassembling the whole machine, a $4 outlet tester told me what I should have known already. I grounded the outlet and the machine has run perfect ever since. Sometimes the simplest solution works.
 
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