Fried Genesis?

[Jorpho]

Someone has been telling me about how he might have put too much voltage into his Sega Genesis. (Details available if necessary.)

Simply put, if this is the case, is there an easily-replaceable fuse within the Genesis? Or is it probably gone for good?

[Richter Belmount]

Taste anything like fried coke or twinkie?

[ooXxXoo]

If the system doesn't power on at all,and you are totally for sure that the problem relies on the actual system and not in the power supply, I would first try replacing the IC power regulator(7805)....

[jb143]

The 7805 would be my guess as well. Luckily they're easy to get and replace. Radio Shack usually has them.

[Jorpho]

So, it's just a matter of opening it up, pulling out the old IC, and putting the new one in? No desoldering necessary?

[FABombjoy]

Yes, soldering is necessary.

How much voltage is "too much"? The 7805 has a fairly wide operating range. If too much was waaaay too much, there may be bigger problems downstream.

Genesis units are like goldfish anyway. Just flush it and get another one ;)

[Jorpho]

How much voltage is "too much"? The 7805 has a fairly wide operating range. If too much was waaaay too much, there may be bigger problems downstream.

Fair enough... I think this was a 115V Genesis plugged into a 240V outlet. (I guess I should have mentioned that first.) Lost cause? Or maybe the PSU just blew?

[jb143]

If you open it up, the regulator is probally going to be the part that's all charred looking. Do you hear pieces inside if you shake it? I've seen regulators blow pieces off when they go. If that's all it damaged then repairs should be pretty cheap and easy. You'd probally just need a soldering iron.

[izarate]

Fair enough... I think this was a 115V Genesis plugged into a 240V outlet. (I guess I should have mentioned that first.) Lost cause? Or maybe the PSU just blew?

If that's the case I think that it's the PSU. Get a PSU that has a 110V input rating and and output rating that matches the output required by your Genesis:

Genesis 1: 9V DC 1.2A, coaxial 5.5mm/2.1mm DC plug (Radioshack Adaptaplug M) center negative

Genesis 2: 10V DC 850mA, EIAJ-02 coaxial 4mm/1.7mm plug (Radioshack Adaptaplug B) center positive

Genesis 3: 10V DC 300mA, EIAJ-02 coaxial 4mm/1.7mm plug (Radioshack Adaptaplug B) center positive

EDIT: corrected Genesis 1 polarity

[evildragon]

Let it be known that izarate is wrong on one thing.

Genesis 1 is center NEGATIVE.