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Hello,

I've just completed my first McWill mod and I've got a problem that seems like maybe I've got a data line to the lcd wrong.

I'm working on a single ASIC (837-9024). I re-capped all 3 boards and verified everything worked properly before beginning the mod. After removing all of the unnecessary components as outlined in the version 2.2 directions I verified my VCC is properly regulated (I've got 4.9V at the McWill board).

I've quadruple checked that all of my connections are correct as per the instructions but when I try a game I get garbled/blocky graphics. I even tried installing a different McWill lcd but get the same result.

It looks like a problem with the screen data but I'm at a loss. Can anyone give me any pointers as to what I could have done wrong?

EDIT: I've just completed the mod on another Game Gear and this one is working perfectly. I haven't wired up the necessary circuits for VGA output yet so I'm wondering if that has something to do with my problem on the first unit. I'll look into that tomorrow night.

20200618_194655.jpg (4.78 MB)

garbled/block graphics

You might have luck by contacting Marco at order-lynx-lcd@online.de, that's McWill. This assumes you purchased the kit through one of the official distributors of course.

Also this and https://www.smspower.org/forums/18006-InstalledMcWillLcdAndScreenDistortedWhenPo... make me wonder whether there is a Game Gear hardware variation we lack documentation for, perhaps a different ribbon cable conductor assignment/different LCD?

Author	Message
philvt101 Joined: 21 Jun 2020 Posts: 1	McWill Game Gear mod garbled graphics Posted: Sun Jun 21, 2020 4:19 pm
philvt101 Joined: 21 Jun 2020 Posts: 1	Hello, I've just completed my first McWill mod and I've got a problem that seems like maybe I've got a data line to the lcd wrong. I'm working on a single ASIC (837-9024). I re-capped all 3 boards and verified everything worked properly before beginning the mod. After removing all of the unnecessary components as outlined in the version 2.2 directions I verified my VCC is properly regulated (I've got 4.9V at the McWill board). I've quadruple checked that all of my connections are correct as per the instructions but when I try a game I get garbled/blocky graphics. I even tried installing a different McWill lcd but get the same result. It looks like a problem with the screen data but I'm at a loss. Can anyone give me any pointers as to what I could have done wrong? EDIT: I've just completed the mod on another Game Gear and this one is working perfectly. I haven't wired up the necessary circuits for VGA output yet so I'm wondering if that has something to do with my problem on the first unit. I'll look into that tomorrow night. 20200618_194655.jpg (4.78 MB) garbled/block graphics

bsittler Joined: 22 Apr 2018 Posts: 530	Posted: Sat Jun 27, 2020 3:52 am
bsittler Joined: 22 Apr 2018 Posts: 530	You might have luck by contacting Marco at order-lynx-lcd@online.de, that's McWill. This assumes you purchased the kit through one of the official distributors of course. Also this and https://www.smspower.org/forums/18006-InstalledMcWillLcdAndScreenDistortedWhenPo... make me wonder whether there is a Game Gear hardware variation we lack documentation for, perhaps a different ribbon cable conductor assignment/different LCD?

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