Forums

Hello!
i am trying to RGB bypass mod my North American SMS to no avail…

Tl;DR
no documentation online on how to use a Voultar rgb pcb on an American SMS. Lots of documentation on PAL pcbs.

1) sourced RGB FROM R51, R55, and R53 respectively. Seen it pulled from the chip and also these spots

2) sourced Csync from 315-5246 chip as I have seen it pulled here before

3) sourced 5v+ and GND from the 7805 voltage regulator

4) sourced audio from previous User RF spot (seen it pulled from here before)

5) grounded my mini Din connector to the GND on the pcb for good measure (also pulled GND from previous RF port)

6) using a retro access Scart cable

7) drew out the mapping from the mini din female port to the legs I would solder to interface with it

8. Plugged it in and nada… nill…. Nothing
got noise that’s not the game just sounds like audio noise from the power line

9) attempted to map/verify the scart cables pinout to the din (I.e does red 15 on scart equal red via the din) and I am noticing something strange…. The retro access cable is not mapping to the din.

example: genesis 2 pinout says red goes to
pin 9 but, when I go to pin 15 on the scart end, it doesn’t go to any of the pins on the din end of the scart?

so confused.

10) mapped out the din female and legs
*see attached and it should work but it doesn’t?

any help or guidance would be amazing! Hope my list helps provide background on what I have done and tried

its like the din and sms is right but the Scart cable is not.
I can’t even get a multimeter to find the R,G,B and Csync on the scart cable. It works fine on genesis consoles? So I am even more confused

FE463021-4212-4966-9C21-C019C83D94C2.jpeg (175.15 KB)

F70ABAEF-78B1-4802-9E5E-CD9D84AE6898.jpeg (3.21 MB)

The best thing to do would be to ask the manufacturer or seller of the board for help if you haven’t already.

They designed and built it, so they should know about its connections.

I reached out to voultar, hopefully he replies :)

Thanks

Can you provide a pic of your wiring on the mini-DIN?

Just an fyi as I found sms 2 rgb bypass mod pics and or instructions hard to find.

The rgb color lines are on the resistors and the csync on the chip in the pic.

Make sure you get a scart cable that does not have caps or resistors inline else it will be super dark.

That was my problem

Author	Message
tengugurl Joined: 11 Jul 2021 Posts: 9	Help please :/ sms ii rgb mod via voultar pcb not working Posted: Fri Feb 18, 2022 10:30 pm
tengugurl Joined: 11 Jul 2021 Posts: 9	Hello! i am trying to RGB bypass mod my North American SMS to no avail… Tl;DR no documentation online on how to use a Voultar rgb pcb on an American SMS. Lots of documentation on PAL pcbs. 1) sourced RGB FROM R51, R55, and R53 respectively. Seen it pulled from the chip and also these spots 2) sourced Csync from 315-5246 chip as I have seen it pulled here before 3) sourced 5v+ and GND from the 7805 voltage regulator 4) sourced audio from previous User RF spot (seen it pulled from here before) 5) grounded my mini Din connector to the GND on the pcb for good measure (also pulled GND from previous RF port) 6) using a retro access Scart cable 7) drew out the mapping from the mini din female port to the legs I would solder to interface with it 8. Plugged it in and nada… nill…. Nothing got noise that’s not the game just sounds like audio noise from the power line 9) attempted to map/verify the scart cables pinout to the din (I.e does red 15 on scart equal red via the din) and I am noticing something strange…. The retro access cable is not mapping to the din. example: genesis 2 pinout says red goes to pin 9 but, when I go to pin 15 on the scart end, it doesn’t go to any of the pins on the din end of the scart? so confused. 10) mapped out the din female and legs *see attached and it should work but it doesn’t? any help or guidance would be amazing! Hope my list helps provide background on what I have done and tried its like the din and sms is right but the Scart cable is not. I can’t even get a multimeter to find the R,G,B and Csync on the scart cable. It works fine on genesis consoles? So I am even more confused FE463021-4212-4966-9C21-C019C83D94C2.jpeg (175.15 KB) F70ABAEF-78B1-4802-9E5E-CD9D84AE6898.jpeg (3.21 MB)

asynchronous Joined: 14 Aug 2000 Posts: 742 Location: Adelaide, Australia	Help please :/ sms ii rgb mod via voultar pcb not working Posted: Sun Feb 20, 2022 7:59 am
	The best thing to do would be to ask the manufacturer or seller of the board for help if you haven’t already. They designed and built it, so they should know about its connections.

tengugurl Joined: 11 Jul 2021 Posts: 9	Good thinking Posted: Sun Feb 20, 2022 8:49 pm
tengugurl Joined: 11 Jul 2021 Posts: 9	I reached out to voultar, hopefully he replies :) Thanks

ApolloBoy Joined: 30 Jan 2007 Posts: 317 Location: San Jose, CA	Posted: Wed Feb 23, 2022 3:25 am
	Can you provide a pic of your wiring on the mini-DIN?

tengugurl Joined: 11 Jul 2021 Posts: 9	My pics for pinout are correct Posted: Thu Mar 10, 2022 4:30 am
tengugurl Joined: 11 Jul 2021 Posts: 9	Just an fyi as I found sms 2 rgb bypass mod pics and or instructions hard to find. The rgb color lines are on the resistors and the csync on the chip in the pic. Make sure you get a scart cable that does not have caps or resistors inline else it will be super dark. That was my problem

Forums

View topic - Help please :/ sms ii rgb mod via voultar pcb not working