jpn megadrive, weird 50/60hz issues

[shortround]

i understand the whole 50/60hz thing has been discussed to death with the megadrive, but all these discussions tend to be about converting a pal machine to 60hz.

i just picked up a japanese megadrive and upon testing it, it appears to be running at 50hz. now, i know it's not one of the hong kong pal versions as those ones have PAL-1 written on the label on the bottom, and this one has the same label as my own untouched 60hz japanese megadrive.

upon opening both systems up and comparing it seems that they both have the same board revision, except someone has added an rf modulator which is wired to the underside of the board at various points and sits at the side of the board, with the cable running out that small hole in the back that all megadrives have.

so, i guess my question is, is it possible to internally mod an original jpn megadrive to output pal at 50hz? i can't test what rf signal is coming from the modulator as the coaxial connector has been ripped off the wire. also, if it IS possible, how do i change it back to 60hz ntsc? what should i be looking for on the board?

sorry to ramble on, any thoughts appreciated.

[Treble]

I would have thought it'd just be a case of desoldering the mod and wiring the correct jumpers. There's a hardware FAQ for the MD on GameFAQs with all the jumper positions on.

[shortround]

ah yes, game faqs. i haven't been there for a while, too many 13 year old americans talking crap. i shall check it out though, cheers mate.

[muddy]

iirc, just snipping/resoldering one of the resistors is all that's needed to get it back to 60hz

when I originally bought my MD it was a 50Hz conversion with PAL RF output tacked on... i soon sorted that out when I'd bought myself a 60Hz compatible tv.

[gIzzE]

You will be able to output 50hz alright but you will never get Pal colour without alot of messing around, you will have to use RGB, which is probably fine?

Have a look at where the rf modulater is wired to, it is probably taking an RGB input and converting that to RF.

[shortround]

you could be right there. i might try and fix the rf cable and see what kind of signal i'm getting.

i've managed to set it back to 60hz now and it has an rgb cable with it anyway so it's no big deal.

cheers