Sound problem - japanese Mega Drive

Hello
Talking about Mega Drives, we already know that first models have better sound quality. There are tons of videos showing the difference, and I not here to ask about it. I am here to ask about a real problem (maybe?).

I have two Mega Drives. The first one is a Model 1 and I have no problems with it. But my second unit is a Japanese model 2, and I have a strange interference in the sound.

The first video is my model 1 with scart cable + Framemeinster.


The second video is my Japanese model 2 with scart cable + Framemeinster too.


As you can see, there is a strange interference in the sound. For me, looks like the right side ins't working properly. And btw, the TV volume is the same.

Is there something that I could try to fix it? Maybe a cap replacement?

 

Moved to the repair forum.

Can't see sound

Check caps first. If that doesn't fix it, look at the Z80 (actually a CMOS Z80 IIRC, so Z84?)

[EDIT]
Oh, BTW, what video cable are you using?

 

Thank you retro.

I use cables from RetroGamingCables.
And I took some pictures:





Looks like everything are ok.
I tried to compare this board at Google Images and I could not find a similar one. Maybe Its a clone console? Would be strange, once there is Sega CD input and components are from Motorola, Sony and NEC.

 

Haha yeah, that's not legit.

It may be the reason, then.

 

Alright.
First time that I see a clone with 32X, SegaCD and RGB out support.
Thanks retro!