Fixing a SEGA Master System help!
So yea, a few years back I tried to power my SEGA Master System with an NES Power supply and blew it. Sooooo since then I havnt been so stupid and also I wasnt in a good state of mind that day. So years later Ive decided to try in fix it (after not finding another one for dirt cheap) But I really have no idea what could be wrong with it. So far Im going over each connection with a continuity tester seeing if I blew a certain thing. Anyone know what I probably blew? Just to help me along.
Could it be the transistor?
Check any Voltage regulators and fuses. You basically reverse biased the circuit. It may be fixable but I doubt if it is if it isn't one of the above.
Any idea what an equivalent would be to the transistor? its says 73058 642K on it
The power supply section should be at the left side of the board (under the power jack...and possibly covered by a metal shield?). More than likely the voltage regulator blew(the larger 3 legged black part with a metal tab). The pins should also be labeled ICO. I is "In", C is "Common", and O is "Out". If you put a voltmeter across O and ground you should get 5 Volts. You can replace it with a 7805 Voltage Regulator you can get at Radio Shack.
Other things to test are the inductors JV and JG, they should each have a bit of resistance. You might even get away with using just a continuity tester...I'm not sure. Check all the electrolytic caps(the round cylinder parts). If they look bulged on the top then they're toast. Other culprits could be diodes in the power section.
I hope this gets you started.
Edit...didn't see your last post. That's the regulator. It's just a standard 7805 5 Volt regulator. Extremely common part.
Last edited by jb143; 01-20-2012 at 12:56 PM.
"Game programmers are generally lazy individuals. That's right. It's true. Don't let anyone tell you otherwise. Since the dawn of computer games, game programmers have looked for shortcuts to coolness." Kurt Arnlund - Game programmer for Activision, Accolade...
Cool Im gonna go to radioshack tonight & pick up a 7805 then. thanks! I need to replace it anyway, it snapped off the minute I started messing with it.
It's most likely the regulator. Seems to be a common issue if the system isn't working.
http://www.digitpress.com/forum/show...-Master-System
Thankfully it's a cheap and easy fix. Best of success on the repair.
Whaddya mean invalid parameters?!
9,000 gigs of ram and it still can't answer a simple question!
Take a look for any scorch marks or signs of catastrophic failure, I have seen ICs where a hole was burned through it. Make sure to clean it up before putting in the replacementOriginally Posted by toploaderleo
Well radioshack does carry the,m, just not in stores 'sooo Im gonna order one online. its cheap enough.
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