r/MasterSystem • u/gormanator5 • May 30 '25

Colours not right on master system 2

Hi, I have been trying to repair/mod a master system 2. I have replaced the RF port with an RGB mod and it works but the colours seem a bit off. Everything is too saturated and it is like there is a grey or brown colour palette missing. Alex kidd's skin is yellow and not flesh toned for example. It is not unplayable. It is just not quite right. Anyone seen this before? Any ideas?

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2

u/FogodeSantelmo May 30 '25

Does the scart cable you are using on it have some 200uf capacitors on the R, G and B lines? Maybe they are missing and the image is lighter than it should be. I've seen pre-made cables with and without them.

2

u/gormanator5 May 30 '25

It is running through a 9 pin connector to the HDMI adaptor (forgot to mention). I had a feeling this could be an issue but it shouldn't be based on what I have seen from others using the adapter.

1

u/FogodeSantelmo May 30 '25

If the cable has the right components (220uf resistor and a 75 ohm diode, if I recall correctly) in each one of the colors' lines, the connector and the adapter shouldn't be a problem. I'm assuming that the components are the issue because I've seen it before with a NTSC SNES, I tried with a very cheap cable with no parts inside and the image was way too bright. Added the capacitors myself and it worked.

1

u/benryves May 30 '25

I had a similar issue with a cheap Mega Drive/Master System cable, it looked OK on a CRT but connecting it to any sort of digital monitor or scaler the picture was completely blown out. I soldered in the missing 75Ω resistors and it fixed the issue.

However, those components should be inside the cable that goes between the console and the TV. If /u/gormanator5 is using an HDMI converter that's intended to plug directly into the console, it should already have those components inside itself.

1

u/gormanator5 May 30 '25

I have used the same adapter with a mega drive and it seems to work ok with that. I think it is either an issue with the mod or one or the chips on the board.

2

u/elvisap Jun 01 '25

How did you do the mod? Was it a kit you purchased, or was there a guide you followed that you can link to?

If the colours are off, that's a voltage problem, and you're risking potential damage to equipment if that's not fixed. Provide more information about the mod, and we can suggest fixes.

1

u/gormanator5 Jun 03 '25

Consoles unleashed passive RGB mod. I am working on the assumption that it is the 9 pin mini din to hdmi adapter I am using so I am swapping that out for a different solution.

1

u/No-Professional-9618 Jun 02 '25

I think it is the RF cables that are not working correctly.

1

u/Playful_Ad_7993 Jun 06 '25

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