Need help with a dead Master System...

PCB problems and fixes
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Chris
Posts: 83
Joined: July 1st, 2015, 8:44 am
Location: Muenster

Need help with a dead Master System...

Post by Chris »

Ok so... i got a dead Master System the other day. Ebay, untested, you know how the story goes. So i opened it up, replaced the NEC 7805 Voltage Regulator with a brandnew L7805CV. Now the green LED comes on. The system has power. However the screen stays black. I get no audio. Is the new voltage translator incompatible? Could it be a capacitor issue? I know Game Gears often show black screens due to aging caps. Any idea greatly appreciated.
mas.jpg
dead nec.jpg
new voltage.jpg
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User avatar
Chris
Posts: 83
Joined: July 1st, 2015, 8:44 am
Location: Muenster

Re: Need help with a dead Master System...

Post by Chris »

Update: all the traces look spotless. I cant find cracks or corrosion of any sort. I also replaced the three 100uf caps, two near the RGB out on position c25 & c28 and the one near the power plug.

At the moment i am wondering if A) the voltage regulator is incompatible somehow, or B) if the z80 is shot?

Is it worth replacing the 4.7uf & 10uf caps as well? I know Game Gears wont switch on due to aging caps.
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