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PCB_Master
11-29-2010, 10:53 AM
Just recently I went to my grandparent's for thanksgiving and brought my genesis along. When I got back home I found out I had forgotten my power supply. :crying:

Anyways, I am now using a 12 volt 1 amp power supply. the led will light but no picture. What is going on?
thelastuser
11-29-2010, 03:47 PM
Speaking without knowing the specs on a oem power supply for it i'd say the 1amp isn't enough and it needs more.

You might have more luck trying to rig it up with an old power supply from a pc.

My genesis was found dead in a basement some 6-7 years back. (too much humidity it seems) Strange thing is I don't even remember what the power supply looked like, and if asked to recall i'd have just thought there was a power cord XD
PCB_Master
11-29-2010, 08:59 PM
Just recently I went to my grandparent's for thanksgiving and brought my genesis along. When I got back home I found out I had forgotten my power supply. :crying:

Anyways, I am now using a 12 volt 1 amp power supply. the led will light but no picture. What is going on?

I now know EXACTLY what is wrong. The PSU I was using was 12 volts AC. Not DC, but AC. I plugged in a different PSU and it works fine now. I AM EXTREMELY LUCKY. And that is why you should always check your PSU thoroughly.
TmEE
12-02-2010, 02:16 AM
Lucky indeed, AC could have killed the 7805's... MD2s have a protection diode so if you manage to shove AC in it, it won't harm anything
raylyd
12-02-2010, 08:31 AM
I found in my sega user manual you can use a 9v 1200mah power Supply.
PCB_Master
12-04-2010, 03:09 AM
Good to know. My Genesis is running off of a 12v 400 mA right now. Seems to be working ok...
TmEE
12-04-2010, 05:00 AM
400mA should cause loud humm in the sound and result in eventual death of the AC brick.......
raylyd
12-04-2010, 08:45 AM
12v 400mA that no good just find a 9v 1200mA should be fine
retro
12-07-2010, 04:57 PM
Absolutely. With current you need AT LEAST the rating, not less. More is fine.
APE
12-07-2010, 09:29 PM
Just don't try that with a Sega CD and bypass the fuse with an even larger fuse after you blow three of them. You'll find out that you have fried the laser and melted large amounts of solder inside....

It wasn't me I swear!