Arcade Collecting > Merit/JVL Touchscreen
Megatouch XL upright bootloops every half second; tried new PSU, mobo, and RAM
obcd:
So, if I understand correctly, with the io board directly plugged into the motherboard it works?
With the riser card plugged into the motherboard and the io board in the riser card, it's not working?
To my knowledge, there are no capacitors on that riser board. (2 lazy to check it out now)
Maybe 2 contacts of one of the riser card connectors are touching each other?
Or maybe, the connections between the mobo and the io board becomes 2 long.
If one of the address or data line buffers is on it's way out, this could happen.
And yes, I have had problems with such isa cards (in a temporary setup)
When the card wasn't perfect vertically in the connector, things didn't work properly anymore.
So you should somehow provide a fixation for the io board if you intend to use it without the riser card.
DaddyLongLegs:
--- Quote from: mahkeymike on January 13, 2017, 12:44:31 pm ---did you try cleaning the contacts with a eraser and also use some 220 grit sandpapper to slide into the ISA slot on the mobo? you might want to wrap the sandpaper around something like a credit card so it gently makes contact with the pins in the slot. Be careful not to side to side. Only straight up and down motion.
--- End quote ---
I will try cleaning it but honestly I think this riser is brand new (I bought it with a new motherboard and IO card).
--- Quote from: lilshawn on January 13, 2017, 12:49:04 pm ---does that riser board have some capacitors on them? in particular tantalum capacitors where pretty popular around that time.. they often fail shorted...even for no reason.
--- End quote ---
There appears to be one of those small orange capacitors that say "103" on them.
--- Quote from: obcd on January 13, 2017, 06:09:52 pm ---So you should somehow provide a fixation for the io board if you intend to use it without the riser card.
--- End quote ---
If anyone has any ideas on how to do that, I am all ears! I thought about things I could do but came up blank.
truckerbob:
My "Google-fu" is weak today, but earlier this week, I saw images of a setup like this, and they made brackets (braces) that went diagonally from the standoff bolt holes on the I/O board to the mounting points on the top of the motherboard. I'll search more tonight, and see if I can find a pic.
DaddyLongLegs:
--- Quote from: truckerbob on January 14, 2017, 08:47:22 am ---My "Google-fu" is weak today, but earlier this week, I saw images of a setup like this, and they made brackets (braces) that went diagonally from the standoff bolt holes on the I/O board to the mounting points on the top of the motherboard. I'll search more tonight, and see if I can find a pic.
--- End quote ---
Thanks so much. I would love to see that. Interesting that someone else had the idea.
I am wondering if I somehow ruined my old motherboard by moving my Megatouch with the i/o board plugged directly in!
truckerbob:
I stand corrected. After a lot of searching, I found the pic I was looking for, and it wasn't what I explained to you. The supports I saw were from the motherboard to the riser.... so that isn't going to help you at all.
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