genesis dead after region/hrtz mod

[Soviet Conscript]

well finally attempted my first sorta complicated mods. did a what appeared to be a simple jp/us and 50/60 hrtz switch mod on my model 1 genesis but after hooking it up i get nothing, dead. can't really figure out what went wrong. i followed the instructions on the mmonkey site for a mega drive but i assumed the process was the same for the US genny. is it? also does the genesis have a fuse that can be replaced like the snes has?

checked all the wireing and it all seems hooked up fine. and it did work fine prior to mod. not really dissapointed because it was a $2 system i picked up and mostly just a learning experence but any further wisdom would be appriciated.

[Sonicwolf]

Holy crap. I did the same mod on a model 1 Genesis, My first hardware mod ever, and it ended with the same results just a few days ago. The genesis was totally dead, no lights, no nothing and I followed the guide to the letter. I have had experience with soldering alot too so I am very puzzled. Unfortunately my Genesis 1 was a very late motherboard revision which greatly differed from the guides pictures but I did find the JP1 thru 4 contacts on the board. Even after I removed the region switch, the Genesis 1 was dead. Saddening as it was my only one. I would be interested on any insight from anyone to what I did wrong also and if its fixable.

[Ponyone]

hrtz, don't it?

[c0ldb33r]

hrtz, don't it?
that was terrible. you should be banned for that.

[raylydiard]

7508 reg gone

[Soviet Conscript]

7508 reg gone

?????????

[izarate]

He means that the 7850 voltage regulator might be damaged. Try testing it with a multimeter. The regulador is a three pin TO-220 chip on the right side of the Genesis, near the AV out ports. Some early revisions have two of these.

[FABombjoy]

And for all you non-dyslexics out there, it's a 7805 LOL

Regardless, before you hop around on your "Jump to Conclusions" mat:

1: Take your voltmeter & clip ground lead to board ground
2: Turn on the power
3: Looking at the regulator, you should measure on each pin, from left to right:

9V, 0V, 5V

[evildragon]

And for all you non-dyslexics out there, it's a 7805 LOL
That's what I thought. o_O Good to know I'm not going crazy....yet..


3: Looking at the regulator, you should measure on each pin, from left to right:

9V, 0V, 5V

Oh oh, can I say why?

From left to right>> Input Voltage from power supply, Ground, Regulated Output.

[channelmaniac]

If you read 9V 0V 0V then the regulator is bad.

It's also bad if you read 9v 0v and ANYTHING other than 5v on the 3rd leg.

If you read 0v 0v 0v then check for a blown fuse or a bad power brick.