+xucaen Posted July 14, 2018 Author Share Posted July 14, 2018 Good news! My new power supply arrived from Best Electronics. Now I have a crystal clear picture, not rolling and no hum or buzzing. I am very happy. 6 Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 14, 2018 Share Posted July 14, 2018 Thank the lord you changed it in time... this could have turned into the full blown check each chip, these got cooked thread! 2 Quote Link to comment Share on other sites More sharing options...
+xucaen Posted July 14, 2018 Author Share Posted July 14, 2018 Thank the lord you changed it in time... this could have turned into the full blown check each chip, these got cooked thread! yeah... about that.... I started another thread... getting bad memory tests and game crashes now.. but man that picture is clear! Quote Link to comment Share on other sites More sharing options...
BillC Posted July 15, 2018 Share Posted July 15, 2018 yeah... about that.... I started another thread... getting bad memory tests and game crashes now.. but man that picture is clear! The RAM chips seem to be the first thing to fail when the voltage gets too high, and when they do they seem to consume a lot of power which helps protect the rest of the chips. When an INGOT failed on me in the late 80's it only damaged the 41256 chips in a RamboXL upgrade, which was bad enough as they were fairly expensive back then. The voltage was around 8.5VDC with no load, a local TELCO tech who was a member of the local users group added a 7805 inline to the power supply cord to make it usable until I could get a replacement. Quote Link to comment Share on other sites More sharing options...
_The Doctor__ Posted July 15, 2018 Share Posted July 15, 2018 start with memory and MMU and work your way out.. Quote Link to comment Share on other sites More sharing options...
+Nezgar Posted July 15, 2018 Share Posted July 15, 2018 The voltage was around 8.5VDC with no load, a local TELCO tech who was a member of the local users group added a 7805 inline to the power supply cord to make it usable until I could get a replacement. That's funny, what did he use as a heatsink? Was there a big piece of metal sticking out from your cord? Quote Link to comment Share on other sites More sharing options...
BillC Posted July 15, 2018 Share Posted July 15, 2018 That's funny, what did he use as a heatsink? Was there a big piece of metal sticking out from your cord? I don't remember the heatsink as being very big. I built a custom power supply that included a crowbar circuit when I got a Newell 1MB upgrade for another 800XL. Quote Link to comment Share on other sites More sharing options...
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