Sega Mega 32X Video Flickering / Distortion

I have a similar Problem with my Mega Drive 2 PAL and Sega 32X NTSC, both modded with ultimate switchless mod.
When i setup my console to PAL (50HZ) the screen is randomly flicker.

Here a video: https://www.youtube.com/watch?v=099XDslR16Q

 

sorry to bring up this old thread but theres not much info on this problem out there,
anyway i replaced all the caps in my 32x, except the low esr one im still waiting on it.

i am running a pal md1 VA4 and pal 32x, both have been hard 60hz modded.
i found the sega service bulletins number 008 and 012, im gonna try n do the mods n report back.
hopefully i can add some photos of how to do it.

link to sega 32x service bulletin:
(wont let me link, google sega 32x service bulletin its a pdf)

parts:
33pf ceramic capacitor
some thin guage wire for jumpers

i found this picture that has the ceramic capacitor already installed, i wonder if this was factory?

(its near the centre near IC4)

 

While I can't weight in much on the rest, that ceramic cap is factory - who knows what they were hacking together back then. I mean of course unless an electrical engineer wants to step in and explain?

Threads aren't closed in the hope that they will be bumped, unless they are rubbish threads... I consider this one of the finest! I know the bulletins you are talking about and if I wasn't curled up in bed I'd stick them on my Google Drive...

I hope you have some good luck! I still haven't tried it somehow... life is just too... lifey?

 

im sure ill get it, i usually dont give up on this stuff lol.
i have done alot of the stuff thats in your vids, i swear i spend more time fixing/soldering retro gear than i do playing it.

 

That's the sort of determination I like to see! From the sounds of it, you've done more than me! Just be careful not to set the house on fire... I assembled a solder reel holder today... not exactly YouTube material

 

nice, i got a twinkle star mvs boot working today . gonna leave my job soon n get into electronics.
im still waiting on the ceramic caps, should be another week.

 

Ah ha! One step ahead of you, quit my job and want to never work again. Hmmm... somehow this isn't going to work is it?

 

I had the same exact issue until I switched my cabled for a boosted sync cable. Something about the 32x's sync isn't right.
The cable.

 

Oh baby, I've got so many SCART RGB cables bookmarked at the moment... don't tempt me

 

whats boosted sync? all my cables are sync stripped, if it worked for you though thats good.

anyway i got around to doing it today because i had some spare time, and it works


first thing i did was replace this 51pf ceramic cap with a 33pf one and cut it to the same shape and put the little plastic thing on it.
second i removed the coil from fb7 and bridged it.


okay so i flipped the mega drive over and put a thick cable from the top of c10 to the ground (middle) pin, it specifies this ground for some reason.
then i removed the cap coming off the top of c19.

there was also a step that stops freezing but these werent present on my revision board.
they are on the backside c100 and c78 need to be removed.