[ThunderPX]

Okay, so, I finally got over myself and decided that modding stuff myself is a lot cheaper than trying to find pre-modded systems.
I followed mmmonkey's guide and started modding my MD2. After installing the 50hz/60hz switch, I decided to take a break and check if I'd actually done it right before putting in the second (language) switch. The results... um:



Let me explain what's happening here. I boot Sonic 1 with the switch set to one setting. Black and white, slightly stretchy, but that's because I haven't received my RGB cable yet. Game runs at a smooth 60hz, now I can finally play Sonic properly. So I turn off the system, flick the switch to the other setting and boot. 60hz again?! Well, yes, but with the awesome bonus of only the PSG channel giving any sound.

I asked a bunch of people for help while doing this soldering stuff, but none of them were really experts on console hardware specifically. We got as far as determining via multimeter that the switch is technically working exactly the way it should be. So my question to you guys is: what the hell did I just do, and how can I fix it?

EDIT: Okay, I've somehow fixed it by resoldering one of the wires that looked a bit iffy... but I'm still really interested to know why it caused the effect it did.

This post has been edited by ThunderPX: 25 December 2012 - 03:36 PM

[TmEE]

So good to see there is no pin lifting involved in a place where none of that is needed.
As for your problem, there are FM DAC power rails near the 50/60 pin, but without seeing any good closeup photos it is hard to tell anything more.