Help Troubleshoot Mega Drive 2 Switchless INstall

Hello.

I have just installed a 50/60hz + region switchless kit (d4s Code) I bought from BadAd84 into a Mega Drive 2. It's really only a practice Mega Drive I had since I am only learning right now.

Anyway I have installed it and I do not get 60hz or the correct led colours and reset does not work.

Press Hold
Red = 50hz Japanese
Green = 50hz English
Slightly different green = 50hz English.

Quick Press
Does not reset.

Can someone give me some tips on troubleshooting or can anyone see what could be wrong?

Is this the correct way to wire d4s Code.

Many thanks






And the reference I used.

 

I tested continuity through the wires from the chip to the solder points and they are all OK, so that rules out any breaks in the wires.

Ground from the chip gets continuity from the RF plate under the motherboard and at the middle LED pin and at the solder points on the board. So ground seems okay.

I am not getting continuity from the outer pins of the LED to the chip, through the resisters. Not sure if that is usual through.

Not sure how to test continuity to make sure my trace cuts are correct.

Cheers

 

Does anyone know where I can test continuity for my scraped traces and the 5v area I scraped?

Cheers

 

The continuity test is fine then. It will beep if the resistance is very low (< 1Ohm), so basically only on a short.

Does the language change on holding reset work?

Can you check the cut near R73 again and make really sure that the trace is open?
Next, please check the voltage on PIC pin 12 (I believe. It's the pink wire one in the reference picture).
It should be high / 5V when in NTSC mode and low / 0V for PAL (could be reversed as well).

 

D4s code isn't wired like you have it.

 

Hi. Yes.

This is what is happening, obviously these are all wrong though.

Press Hold I get
Red = 50hz Japanese
Green = 50hz English
Slightly different green = 50hz English.

Reset does not work.

I will check the things you mention now. Because I am new to all this. I check the voltage with console on, of course?

 

Ok. Thanks BadAd. I will get on it and wire it like that. There is no reference anywhere online showing how to do it.

 

That did it. Many thanks. The link to the PDF isn't working on your listing for this kit.

Does anyone have a fix for the LED colours.

Currently there are two green states which are practically the same. Is that meant to be like that. The two resistors supplied were the same value.

Many thanks

 

You can change the value of the resistor to make the difference more noticeable. If both look green, you want a higher value resistor on the green line or lower on the red.

In the original documentation for the mods (by their creators) - they used same values for both.

Ill fix the link, thanks for letting me know

 

Cheers. Think I will keep it as is. With the housing on it's noticeably different. Maybe if I ever attempt this mod again I will do a different LED.

 

Last question for Bad_Ad84

What value were the resisters you supplied and what type of LED was it? For my future reference.

Cheers

 

220ohm, red/green common cathode.

 

Many thanks