Arcade Collecting > Merit/JVL Touchscreen

JVL Retro has no sound and front control pad not working

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Fattdirk:
I just picked up a JVL Retro and it has two issues that I'm trying to resolve. The sound is completely dead. I pulled the CPU box and the sound amp chip looked completely fried with a nice little hole burned into it. I ended up replacing it as well as the 4 electrolytic caps on the IO board and still have no sound. Also the 1000uF cap on the main board looked pretty crappy so I replaced that. I did have one improvement in the red light on the front control pad is now on but it still doesn't work and there is no calibration option for it in test mode.

Without schematics I'm unsure how this machine works to identify if the piggyback board is bad or if it is something on the main board. Any help with be appreciated.

Thanks.

Fattdirk:
Ok well I figured out the sound. It turned out I had plugged the ribbon cable into the wrong connector on the motherboard. Turns out you plug it into the one that says 'sound'. The joystick controls still do not work so I'm still looking for advice on those.

lilshawn:
typically the joystick board has crap spilled on it... shorting out the encoder IC on the board. you MAY be able to remove and clean the board, but i've never had more than 50% chance of it working properly.

the joy board is simply a USB device to the computer.

Fattdirk:

--- Quote from: lilshawn on April 22, 2018, 12:51:01 am ---typically the joystick board has crap spilled on it... shorting out the encoder IC on the board. you MAY be able to remove and clean the board, but i've never had more than 50% chance of it working properly.

the joy board is simply a USB device to the computer.

--- End quote ---
Is it a readily available chip? Just a standard usb chip?

Sent from my Pixel XL using Tapatalk

lilshawn:
I don't recall. I think it's an atmel microcontroller with built in USB. been a while since i've bothered to fix a joy board. if you replaced it you'd have to program it. I think you can still buy the boards though.

peel it open and take a look... if it's nasty dirty (which it probably is since it's kinda badly designed to keep stuff like dirt and liquids out)  get yourself a toothbrush and some 99% isopropyl alcohol and give it a scrub. it may come back to life.

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