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Maybe someone has already come up with this and I just haven't seen the post, but I thought I better share my experience so far. I had a feeling it was not the jack inside the express that was to blame, but likely the plug on the a/c adapter. I carved into the end of one to see there's not much inside to make contact with the express jack so I ordered a couple new ends from Mouser and just got done installing them. As far as I can tell it was a successful repair!

I had an express and a/c combo that would cycle on and off with the slightest cord movement, after the plug repair, constant power even with tons of cord movement.
Plug # at mouser: 171-3224-ex. Cost $1.16. One more stupid problem with our beloved toys resolved: priceless...

https://www.mouser.com/ProductDetail/Kobiconn/171-3224-EX?qs=nYmQ2F2SofZBdVlk7SzOtA%3D%3D

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turboexpressacplug2.jpg
turboexpressacplug1.jpg

Awesome!  My Turbo Express A/C adapter does the same thing and it's driving me crazy.  Glad to see it's a quick and easy fix.  I'm going to have to order one of those ends and fix my A/C adapter.  Very good find.

Great fix, I have an AC adapter too that has the same issue.

Good work  =D> You should add one more image or a little diagram showing how to attach the wires properly and then this should become another Repair Guide.

Agreed; you just solved the problem for my broken supply as well!

Ok, step by step and drawing for the DIY'er:

Cut off original a/c end.
Strip off a half inch of the black, pull back the wire and twist up nice in order to thread through the hole in the new plug connector.
Strip off a quarter inch of yellow plastic insulation and twist up to thread through other new plug connector hole.
Disassemble new plug by prying in half.
Feed wires through holes in correct leads as shown in drawing and apply rosin core solder.
Crimp in the tabs to hold cord in place.
Put plug halves back together.
Plug in to wall and check voltage with a DMM if you have one, red lead core and black lead shell, if you see 7 VDC you're done!
Plug in to TE and enjoy the fruits of your labor...

teacfixdrawing.jpg

Awesome! I'd suggest posting a request in the following link to make this topic into a "REPAIR GUIDE sticky" topic - https://www.pcengine-fx.com/forums/index.php?topic=6517.0 (https://www.pcengine-fx.com/forums/index.php?topic=6517.0)

Thanks for the repair guide akaviolence.  I have made it a sticky.

What are the voltage specs on the TurboExpress adaptor?

Just found a photo of the specs. It's not my photo, but this may help. :)

TurboExpressACAdapter.jpg

NEC Turbo Express AC Adapter
PRODUCT CODE: HES-ACA-04
INPUT: AC120V 60Hz 13W
OUTPUT: DC7V 700mA

(-)----(0-----(+)    [center-positive]

Well I guess it's worth a try on my adapter as well... Ive been plagued by this issue for around 10 years.

just in case the website that sells the adapters die, the tip size is 3.4mm x 1.3mm that way you can find it if need be

I'm finally fixing my Turbo Express adapter but could not find the video I could of swore Jason made. So I remembered this post. Wasn't there pictures or a link to the video before?

This appears to be about just soldering a new male plug to the original power supply because the original is crap and would become loose to where a little bit of movement would cut the power off. I wound up switching plug styles to solve it myself.

https://www.mouser.com/ProductDetail/Kobiconn/171-3224-EX?qs=nYmQ2F2SofZBdVlk7SzOtA%3D%3D

GameTech Jason suggests just ordering that part above from mouser as a superior replacement that solves the loose power connection problem. I doubt he made a video because if you need one for this, you haven't learned basic soldering yet.

You're buying something that looks like this below, you're gonna cut old plug off, strip the 2 wires from the power supply and solder to new plug, easy as 1 2 3. As long as you solder positive and negative wires to match polarity, should be no sweat.

dcplug-turboduo-new-dis.jpg

But yeah, I can't imagine somebody made a video just for this. Just a general solder demonstration of wires to plug (https://youtu.be/HAuW4klh7jg) is what you need if you've never done it before.