I picked up a Tandy 1000HX and CM-5 monitor last weekend. The motherboard powered on a few times, but then stopped working, power supply seems completely dead.
I disassembled the unit and see nothing wrong; the power supply fan spins if I disconnect the main power lead to the motherboard, which is not a very reassuring sign.
Teardown photos: https://imgur.com/a/lJ8Rd
Anything look like a problem there?
Check all tantalum caps for shorts. Very common fault.
wrote:Check all tantalum caps for shorts. Very common fault.
I looked over it pretty well, nothing looks blown. No capacitors have leaked, the PS fuse is intact, so not sure.
You can not see a short tantalum cap, they often look still intact. They don't leak either, they just go short. Tantalum caps are those orange, drop-shaped ones (e.g. C31A).
Carried it downstairs, it started working again. I took it apart again, found a little metal piece floating around under the motherboard, I bet that was the problem.
Hope it didnt' short out anything important...
Glad you got it working. 😀
My first "IBM Compatible" was a Tandy 1000HX. It was a neat little system, I just wish I'd realized at the time how much it could do. It was way outdated by the time I got my hands on it in the mid to late 90s (my brother passed it on to me) and I figured it was worthless since it couldn't play any games and we never even owned a mouse for it. If only "retro" computing had been a thing in 1997, I could have probably done some neat things with it. 😀
Now for some blitting from the back buffer.
