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Javmaster

Help with fried Atari 520ST

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Howdy, new in here, want to ask for some help if I may: I am new in the platform and got an Atari 520ST from a friend, just the CPU. Searched online and found the schematic for the power and bought the DIN, connected to the 2 5+, +12, -12 and grounds. When connected smelled burnt and saw a little white smoke. Disconnected immediately and later realized the schematic was backwards, and was not the cable, so I basically switched the cables. 
Feeling bad but looking for guidance on how to find the burnt or faulty components to replace. Any help will be greatly appreciated.

Jav

Screen Shot 2021-08-14 at 7.33.34 PM.png

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Serious mistake. It got power reversed, so actually chips got -5V instead +5V. Most likely many of them is dead. And likely will be cheaper to get another Atari than repair this - not to mention time needed to find components ..

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If it's truly dead, I hope you can sell it off as a parts machine. The case, keyboard, some ports like the cartridge, ACSI, monitor and disk drive ports can be used by others.

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Well, after all the computer was saved, thanks to Joe from Joe's computer Museum. He nicely offer his help, found the problem and fixed it, also he upgraded it for me.

 

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Just watched your original video and the Joe's repair video. I'm sorry that you had these troubles. It's easy to get those pinouts backwards. I've gotten some backwards before because it wasn't clear if the pinout was looking at the port, or the cable. Luckily, I've never had that problem with a power cable. I was also glad to see that Joe was able to fix it for you so easily, and what a class act, to upgrade the TOS for you.

 

Congratulations on your new 520!

 

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Yeah it's funny how this female male connectors can get confusing.

Is it the female on the computer or the male? 😁

EDIT:   Anyways I blame the women for this confusion.  😉

Edited by Chri O.

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1 hour ago, Chri O. said:

Yeah it's funny how this female male connectors can get confusing.

Is it the female on the computer or the male? 😁

EDIT:   Anyways I blame the women for this confusion.  😉

 

Just be thankful that there are *really* only male and female connectors... <rolls eyes>    :)

 

PS and to the OP, 'gratz on getting it going!

 

Edited by DarkLord
Additional text...
  • Haha 1

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I saw the video yesterday as well. The damage could have been a whole lot worse. You got lucky in that respect, and Joe was really nice to help out. 

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I guess everyone noticed that very early version of TOS in that machine.

 

AFAIK, only a handful of early 520ST's came with TOS not in ROM, but

run from floppy.

 

I've been around ST's for a few years (1985) and I have never had an

ST that didn't have TOS in ROM...

 

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Okay I'm just kidding 😞

56 minutes ago, DarkLord said:

 

Just be thankful that there are *really* only male and female connectors... <rolls eyes>    :)

 

PS and to the OP, 'gratz on getting it going!

 

 

46 minutes ago, DarkLord said:

I guess everyone noticed that very early version of TOS in that machine.

Yes this this was indeed TOS version less than 1.0V 😉

 

😊 Since some of you are die-hard Atari fans you should read this: The Atari ST, Part 2

 

😄 Author: landon
My mom thinks I'm in high tech......

Edited by Chri O.

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I've actually read that before. I believe it was posted in some of the ST forums.

 

It's actually very good stuff. I enjoy reading about that time. Don't know if we

will ever see it but I'm looking forward to the sequel to Atari Inc, Business is

fun. I think it's supposed to be called Atari Inc, Business is war.

 

It should cover much of that time frame...

 

Thanks for the link.

 

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