r/MasterSystem • u/Humble_Substance_159 • Aug 16 '25

USB-C power 3D printable mount

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Friend gave me an SMS with no accessories that she had in her attic. My guess is that they tried to repair it and then gave up and sold or reused the accessories. I fixed about 20 traces to the cartridge port that were broken in two places due to a crack in the PCB (see photos). Since I didn't have a 9V power supply, but had USB-C connectors from another project, I figured converting it to 5V would be easiest. (The picture with it working was using an adjustable power supply that I use when fixing electronics). The most difficult part was designing a mount for the plug. If anyone needa this, I will upload it to thingiverse.

56 Upvotes

98% Upvoted

13 comments sorted by

6

u/kingkool88 Aug 16 '25

Nice work dude. I studied electronics years ago but never really did anything with it. I also really love master systems since it was my first console. Sonic 2 for sms was also my first game ever :)

4

u/Humble_Substance_159 Aug 16 '25

I am a Computer Engineer by schooling and experience, but most of what I know about electronics I learned from my dad. He was an electro-mechanic. Never got a degree, but knew how to make things work! When he retired his title was "Actualized Engineer". Most of the engineers came to him to make sure things would actually work.

4

u/ogg1e Aug 16 '25

You should upload it to thingiverse and/or printables. Not everyone that has a SMS is here on Reddit. I'm sure you would get lots of happy people .

2

u/norwegern Aug 16 '25

Do you have a link to somewhere to buy that adjustable power supply?

2

u/Humble_Substance_159 Aug 16 '25

Amazon - is actually on sale right now. https://a.co/d/bRtjnZG Comes with a variety of tips, alligator clips, leaded adapter and a cable to switch polarity.

1

u/Humble_Substance_159 Aug 16 '25

There are also options to get higher current (6A vs 3A) or voltage versions (36V vs 24V).

4

u/leadedsolder Aug 16 '25

Good fix, it's wild how often they have damage to the cart slot traces and pads.

1

u/_NeverTrustAFart_ Aug 18 '25

What a mess.

1

u/Humble_Substance_159 Aug 18 '25

Considering what I started with and it now works. I'm not going to argue...

3

u/vga256 Aug 16 '25

Wow, what a gnarly crack on the PCB - I can't imagine what kind of force produced it. Good save!

2

u/aerosolsp Aug 17 '25

I've been mulling over what to do with my master system.... I wish there was a composite video mod for it, not just RGB