Sega-Naomi

Ok something is up with my IO adapter. Whenever I turn it on the image on the monitor is all yellow. I know it's not the monitor because I tested another board on it. Does anyone fix these things?

Take a look at the JAMMA connector pinout. Take a voltmeter and run a resistance check between the red, green, and blue pins to ground. I bet you'll find one of them shorted to ground.



There are little bitty surface mount overvoltage protection devices on those video lines. Take a hot soldering iron and take the shorted one off.



I haven't found a replacement part for it yet but the board will run without them.

Here's the defects





:smt012

Man, that really sucks. This is usually a symptom of too much voltage. :smt009

Yeah, one doesn't usually fix those sort of things. When I got burn marks like that on my PC, it went as far as to catch fire. :/ if only I could combine your problem with mine, my voltage is too low hi5

Yeah, something happened to put too much voltage down that line... it fried the little protection device.



You can take a hot soldering iron, blob a bunch of solder on each side of the part then heat it up so the part comes right off the board.



RJ

Well I managed to take the defective chip off does anyone know how to bridge the points?

There's no need to bridge the points. Look at where the traces go. If you did bridge them you'd short out the pins on the JAMMA connector.



The only trace there not going to the JAMMA connector is one going to ground. You don't want to bridge to that.

Woo! It's alive! Thanks! :smt026