Yeah it has a game in, without a game i just get a black screen, i have tried 3 different games from all the 3 regions (US,JPN & UK) So if leaving the JP stripped like this.... it should default to a 60hz signal?
No - you need to bridge two jumpers. Go and look at the diagram again - either 1 and 4 or 2 and 3 HAVE to be bridged. As the traces are cut, nothing is.
You have two options. Link correct points to just lock it into your single region of choice (easier, no case hole needed). Or install switches and you'll save space by having effectively four models of Megadrive in one. (tougher yet better compatibility) There's also switchless mods for a somewhat more advance idea.
If the jp points aren't connected, the pins on the ic's the jp points go to pull themselves high (ie +5v). This is why the single switch mod works. If you note, language to get japanese is ground and to get 50hz is also gnd. This how the single switch mod works, by grounding only what you need for the region you require. This works for both mega drive/genesis model 1 and 2 and it's various revisions.
So should or should it not work, if i have no connections as in the picture above with nothing bridged atm??
That only helps my point. Calling a Megadrive with factory RF unit "Japanese" is ambiguous. It could mean any combination of the console's language setting, country of intended first sale, or manufacturing location.
Hmmm the mystery deepens, im getting no sound from the headphone jack on the front of the MD at all and have tried 3 games all from the 3 regions!. What the hell has happened to it, surely removing the RF module and wires connected to the mainboard, capacitor between the pads on JP2 and the oscillator on the underside of the mainboard would cause not only to get a display but no sound either, so that would suggest the game isnt even loading or though when i turn the console on i get a black screen for a second and then a complete red screen??
It's bad practice to cut any component without knowing the extent of what it really does. That oscillator could've been the CPU clock. Those wires might've bridged together important points there wasn't enough board space for actual traces. So forth.
Well no not really as all the stuff ive removed was an after mod to make the JNP megadrive work with an R/F lead, so removing the components shouldnt have no ill effect on the console as all im doing is putting it back to how it was
There Think the blue capacitor was between the pads of JP2 on this megadrive though, not JP pads??. Can you suggest anything think i can try with?? This is how the RF unit was wires up.... Surely removing that wouldnt cause this red display issue via scart connection?
Try attaching a Mega CD. If cartridges don't work, the expansion bus might. (depending on the problem's nature)
I dont have a mega CD I have replaced the rf module and oscillator and still no joy. Im guessing something must of happened when i removed the capacitor from the JP....not sure what though as it still must be getting a signal of sorts as if i turn it on without a game in there is no read screen just black, but with a game insert i get a red screen
Ah ok, well it cant be the actual cart as as ive said ive tried 3 different carts all from different regions (JNP, US, & UK) surely they all would give a CRC error?. Any ideas what can cause a CRC error on the console side?, and how this might have happened or be fixed? Can a 1 swtich 50/60 & Lang mod be done on a Mega Drive 2 console?
It'd be interesting to try a four position switch. Not quite sure how to wire that. But every mode the hardware can do, in one place sounds nice.
So the only thing the 3 position switch is missing is a PAL/JPN setting? Not sure how me personally would benefit from that seeing as id be using a scart lead It would seem you can do the 1 switch mod on a MD2... http://www.youtube.com/watch?v=618ZyjGWt9c strangly the GND goes to the middle pin of the switch and the lang to lef pin and 60hz to the right pin
