VOGONS


First post, by zconnect

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Long story short, I accidentally shorted my turbo display. I was stupidly trying to remove it from the case in a short amount of time after having too short of a sleep the night before, and the bottom row of jumpers, and maybe a bit of the top row as well, touched the metal case. Computer rebooted, there was smoke, I turned off the PSU and checked damage. The power pin base seems to be a bit melted, which is where I assume the smoke is from, but it just won't work anymore. Do I need to replace the screen? Or how do I tell which components to replace? Traces don't seem burnt, and the only thing hot after it happened was the power pins base and the connector. Can't exactly get another one of these, since every case is different, so I'll have to fix it as best I can and maybe sleep a bit more before dealing with stuff like this. I can order a generic screen and solder it if that'd fix it? I think the weird coloured stuff on some of the pins is old flux from the factory or something.

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Reply 3 of 6, by rasz_pl

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do you have a multimeter?

https://github.com/raszpl/FIC-486-GAC-2-Cache-Module for AT&T Globalyst
https://github.com/raszpl/386RC-16 memory board
https://github.com/raszpl/440BX Reference Design adapted to Kicad
https://github.com/raszpl/Zenith_ZBIOS MFM-300 Monitor

Reply 4 of 6, by snufkin

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It's probably not the cause of the problem, but I think there's a misplaced jumper (marked with an arrow) that will connect the 'always on' and 'high speed' options.

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Reply 6 of 6, by wiretap

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Per the datasheet, it is a direct drive 0.5" common anode display. Those are really common and newly manufactured replacements can be found at Mouser, Digikey, eBay, Aliexpress, Amazon, etc.

The transistors can also be found at the same places.

All those components can be tested for failure, just desolder them. Put the LED display in a breadboard and test each segment, and grab a cheap component tester for the transistors. Replace the cooked ones.

My Github
Circuit Board Repair Manuals