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Hi again, Now that i am progressing (hope so) in my novice knowledge of MVS repair, i grabbed an old MV1A slot that considered as scrap. First watchdog’ fixed that with broken trace on bios pins. But still only boots on diag bios. Stock and unibios still watchdog. Second the diag screen is...

Now to finish the setup of the slot i repaired, it sadly came without the plastic cartridge holder, which if i recall consists of 2 parts, held togzther with some screws. Any open source availabke 3D file for this exact slot so i can try to print it at a friends office, which has a 3D printer...

Hello, This is to share my first experience of modding a CRT into RGB. This one is a Sony Kv-1499X. Having only RF and 2 Composite inputs (typical for sony CRTs in north africa) i started by reading it's manuals. Found out in the manual that the jungle chip had actually a second RGB inout...

Ok this one is getting me nuts. After a long diagnostic and cleaning, i suspected that the black screen issue on my megadrive model 1 might be the CXA1145P video chip (under the heat sink). I went ahead and removed it, put on a chip socket , and replaced it. Still a black screen. By...

Greetings comrades, Any recommendation for dealing with a rusty screw on an MVS cartridge? Tried WD40, but the screw head is almost gone. Put already some hot glue and gummy, but that one b**** is stuck as it was welded. Dont want to damage the cart plastics of course...

Hello. So i got this MV1FZS slot initially witch back up ram error, and i tracked it town to U17 (HC32 chip in back up are). Swapped it and the error disappeared. Now i got a new error "MMIO dead output", showing some bad connection i assume between Neo-C1 (1) and Neo-F0 (47) I checked...

This one is driving me crazy. The exact same glitch is present whaterver i do. What i did so far: - Both PROG and CHA borad cleaned and checked for brocken traces. Found 2 and patched them. - Checked PRom CRC in Unibios and it matches OK. - S1 ROM does not match CRC in Mame so burnt a...

Working on a ACH slot with np sound issue. It has also vertical lines on game screen which appear on small area like game title. Board is very clean, no corroded traces and bettery removed. I cleaned and reckeaned it and cart port also. Diag bios with cart gave the following error: Checked...

Hi again, I recently had an MV1F slot (the one with the two controller ports) that wouldn't boot. Basically, when powered on, the red LED wouldn't light up, and the monitor switched the signal to a black screen. No reset, no watchdog, no click, no sound, absolutely nothing. I measured a few...

Hi, I had a Puzzle Bobble cartridge lying around at the bottom of a box, and I wanted to play a game. It worked fine, except for a few tracks that had a heavy, really unpleasant crackling sound. I did the basics (cleaning, suspect soldering), but nothing. So I moved on to reading the maskroms...

Hi community, After the last repair a few weeks ago of my MV1FZ slot, which had a sound problem due to the neoC1 that i replaced, I start having a similar problem, once again. The sound seems to be missing tracks, and always cuts off at the same place, at the beginning of the intro. After a...

Hello everyone, Back for advice. I have a 4 slot MV4FT which works wonderfully except for slots 3 and 4, where the sound is very glitchy (it looks like the rendering of an Atari 2600 with 0.5 bit rendering lol). Very clean PCB, no cut trace, no corrosion, battery removed before my possession...

Hello, recently i was playing around learning to exploit eprom programming fro various consoles. i succeded in creating the 240p test suite on a MX27c4100 eprom over a sega genesis cart. now i wanted to create the Gentest diagnostic tool for megadrive using the same ressources. the size of the...

[EDIT] : corrected few Eprom references. hello, beginner as i am on the arcade field, i will share with all the recap for creating a cheap version of the 240p test suite for MVS. the idea came after many friends were complaining about their arcade system geometry, and the difficulty to adjust...

Hi, Starting with a watchdog on my MV2F, I managed to identify the problem by changing the NeoC1. Now, the slot starts, but with a phenomenal glitch, in the crosshatch, in the rom diag.. I resoldered a track around the battery (the PCB is really clean, minor corrosion, minor battery leak). I...

Hello all, I hope i can find the help i need in this community. Already spent 2 years in forums, reddit, trying to figure out the issue but without success. So for my pvm, it's a 20m2e model. Came 2 years ago with few issues, 3 rgb horizontal lines collaps on top, and some display issues...

Hello, My MF1z plays games fine, except for sound when starting the playgame. Menu is ok, character select is ok, but when after selection i can hear the starting neogeo logo. In addition starting the level will stop the music and sounds. Exactly at the same position every time. I got with...

Hello, Quick intro, i am getting old passionate guy of retro gaming, specially restoration, related to home consoles (Nintendo, Sega, Atari, etc..) Quite new to the aracde world, i hope to find the same energy with you all to expand my discovery addiction into this new world!