Minnesota Retro Tech Club Free Table Gets:
i've been wanting a smol 8088 system for testing software compatibility and performance and this Toshiba T1000 is cool as hell
but they're all notorious basket cases by now and need recapping and repair
it has the EMS CARD!
indeed the battery, (a local replacement from 1992?) initially looked clean but its corroded ALL THE WAY UP THE WIRES and is starting to eat the board
cleaned it up best i could without stripping the board, you can run it off 5v on the battery connector if the DC/DC isn't shot but it is very much not functional right now
also snagged a Toshiba T4800CT
a pretty badass 486DX4/75 system with local bus video and WSS audio??
no soundblaster or FM chip so not an ideal DOS gaming system but i've seen few 486 laptops with audio at all
i really want to get this running
it just flashes a P41 error which is a main 12v bus undervolt
looks like its gonna be another power supply repair 🫡
welp lets dismantle it and get to any battery bombs lurking in there
there's one right there in the hinge, doesn't seem to have leaked
there it is, the 486DX4 and the chip (not a set unless you count the SuperIO)
well there's the motherboard, WD90C24A and a bunch of RAM on the backside, sound card and connectors are on another board
this thing has many layers, still a button cell in there to get to, power supply board not lookin' obviously bad
moar later i gotta get ready for Ground Zero tonight 💃
what is even going on with this power supply board, it connects to the motherboard through this one connector
that P41 error is displayed on the LCD above the keyboard, which means there's gotta be a microcontroller in here somewhere... IS THAT IT ON THE POWER SUPPLY BOARD?
it sure has a parallel bus going off to the connector
if you've got low voltage, obvious thing to do is check for shorts
other side of the interconnect has some thick traces on multiple pins, those gotta be the power rails
probably have 3.3v, 5v, 12v and whatever voltage the backlight inverter wants
seems like each rail is sandwiched with a ground trace on the plug
nope, not seeing an obvious short unless i'm wrong about the grounds
checked all the big filter caps, nope no shorts, checked some caps on the motherboard too, no shorts
dang it, well this might be a tough one
ON THE SHELF IT GOES cuz my main desktop computer needs to be rebuilt :(
(ノಠ益ಠ)ノ彡 ᖇETᖇO ᖇOᗩᗪKIᒪᒪ (ʘ言ʘ╬)
Steffi
(🖬🖫). ₍^. .^₎⟆