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Atari 800XL blown from bad SIO device

dead 800XL SIO

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#1 TechCowboy OFFLINE  

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Posted Sun Feb 26, 2017 11:25 PM

When I turn on my machine now, I get a "bizzzz" sound about once every 3 seconds, and I assume, a blue screen (I say assume because the no-signal screen is blue on my TV as well)

 

Other than blown capacitors, does anyone have suggestions on troubleshooting?


Edited by TechCowboy, Mon Feb 27, 2017 12:02 AM.


#2 Kyle22 OFFLINE  

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Posted Mon Feb 27, 2017 12:16 AM

Those words could mean anything... I don't know what a "bizzzz" sound is. It could be a form of NAK, but what is NAKing at boot?

Do you have SIO devices connected?

 

The normal sound with no bootable devices is closer to a fart type of sound, not a "bizzzz".

 

Can you post a video (with audio, of course) of this?

 

That would be the most helpful way for us to begin to solve this.



#3 _The Doctor__ ONLINE  

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Posted Mon Feb 27, 2017 12:24 AM

make sure your power supply is putting out the proper 5 volts before proceeding and that the television/monitor works with other devices connected the same way ie composite or rf.... before proceeding... we don't wanna cook anything more than what might have been already...  then only connect the powered up Atari to that display with nothing else connected...

 

as for what might have blown.... feel for hot chips...    what sio device was bad and in what way?


Edited by _The Doctor__, Mon Feb 27, 2017 12:24 AM.


#4 Rybags OFFLINE  

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Posted Mon Feb 27, 2017 6:45 AM

With no peripherals attached, the startup SIO sound shouldn't last more than a few seconds, and not repeat once finished.

If the TV is showing no signal then I suspect it's a bit of a deeper problem.


Edited by Rybags, Mon Feb 27, 2017 6:46 AM.


#5 TechCowboy OFFLINE  

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Posted Tue Mar 28, 2017 10:55 PM

Following up on this.  It turned out it was the power supply.  It was putting out the right voltages, but not enough current.







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