[PS1] Problems with MM3 modchip install

[Nathan McGuire]

I bought 2 MM3 modchips from a very reputable source. At $4 a piece I figured why not get two so I installed the modchip (PSone SCPH-101 NTSC) and tested it out and it didn't play any of my backups. So I rechecked all of my soldering points and what not everything is perfect according to the diagram. Thought a little bit more and maybe the chip is bad so I replaced the chip withe the spare that I ordered and it didn't work either so it must be one of my soldering point but everything looks great. Maybe my diagram is wrong or something but if anyone could help me it would be greatly appreciated.

[Zorlon]

Other things to test

Original discs
backups from the same region and from PAL and NTSC/J region, see if it's working with anything to start with

P.S. I have seen a few different diagrams for this mod chip and with the PSone

I would take points 2/7 off for now that are just for stealth and make sure the thing works first without those

Not 100% sure but I don't think you require 5 & 6 for very basic operations and should be able to boot same region games without protection without those points

One of the attached shows an alt for point 1 but this is an older diagram

[Nathan McGuire]

Well I did test my originals and they worked great... I don't have any games outside of my region though and I know that my backups work because of the swap method I did till the modchips got here. I don't know where to go from here... lol

P.S the board is PM-41(A)

[Zorlon]

just download a small jap and small pal game

I attached an alt diagram you can try, it's an older diagram though

the attached are wrong I will update this post with the correct diagram for your model...

[Nathan McGuire]

I redid it to the diagram on the right (I installed it using your one on the left) and it works! Thanks so much

[Zorlon]

I don't see your diagram... Maybe it didnt upload right? lol and ill find a Jap game to download

My first reply has them but they are not correct anyway

Looks like you got all the right points but I can't tell what chip point is connected to each point except 7 and 2 that are perfect

[Nathan McGuire]

I redid it to the diagram on the right (I installed it using your one on the left) and it works! Thanks so much The one on the left doesnt wanna work for some reason... Odd but ohh well it works now. lol

[Zorlon]

odd... but at least it works for now

Might just be the older version of the MM3

[Zer0-2k11]

The diagram you were trying to use before was a OneChip Diagram (Which is for pal scph-102 consoles only, just a heads up).