Genesis Model 1 VA6 RGB Bypass Issues

[OtherScott]

Picked up the Voultar RGB bypass board a few years back, finally getting around to installation on my Model 1 VA6, however I’m not getting any video or audio after installation. (though audio is likely due to the video scaler not getting video, since I’m pulling from the headphone jack)

I’m using an OSSC with a CSYNC SCART cable, using the original model 1 DIN. This setup worked fine before doing the mod. The OSSC detects a signal, transitions from the grey start up screen to black, and after a few seconds my TV reports no signal and stays that way.

Poked around with the multimeter, connects all seem good. Board is getting 5V, and outputs go to the correct points on the DIN.

I DID snip pin 11 accidently on CXA1145 (swore I checked that was the correct pin to SYNC on the DIN, and the retroRGB guide says pin 11, but apparently its pin 10), but I patched that back, and the connection looks good (and as far as I can tell from pinouts, it doesn’t do anything). I also had the 5.6k pull-up in there originally, but removed it just to see if that was an issue or not, but same result.

Any insight on this would be appreciated, thanks.

• This topic was modified 13 hours, 56 minutes ago by OtherScott.

[TheCorfiot]

Hey Scott

Bas From BetaGamma here.

I’m going to be honest with you its a pretty bad install, I can see lifted tracks, shorts and you are hooking up to wrong pins left right and centre.

These mods do require a degree of precision as there are some fine micro pitched legs on the main chip.

There is an official install document I produced which is linked on the sales page but I cant see any evidence that was followed.

Truthfully it needs complete removal, repairs to tracks and pads etc and then a fresh install in accordance with the install doc.

To obtain the reduced noise performance with this bypass board strict attention to the path and placement of the wiring is required to reduce digital noise pickup, that hasn’t been paid any attention either..

My advice is do some research and read the install document

 

[BuckoA51]

For reference while we no longer stock this part the install guide can still be found here – https://videogameperfection.com/2018/08/28/megadrive-bypass-installation/

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