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280 posts

Ultimate Geek


Topic # 109178 14-Sep-2012 12:46 Send private message

Hi all,

I was going to throw out my Sega Master System II today, but remembered there is an RCA mod you can do to it, and  though I would give it a go..

I've found a few guides, but they all use a drawing rather than photos..

ie; http://hackitup.tumblr.com/post/548848692/sms2videoaudiomods

I find those type of guides hard to follow, as I don't know if that is the bottom of the board, or the top of the board..

Does anyone know of any guides like this one (different chip): http://www.youtube.com/watch?v=pJxBgH-zBVQ

My chip is the Sony CXA1145P.

Would be cool to try this out if its not too hard.





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653 posts

Ultimate Geek
+1 received by user: 20

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  Reply # 685974 14-Sep-2012 12:53

That diagram should be all you need.  The text says the chip is near the top of the board - should be close to the video output.

The alignment of the chip (and hence the pin numbering) is determined by the notch on one side.

Edit: Here's a picture of the PAL board - the chip is in hte middle, and the pins clearly labelled on the PCB:

http://www.smspower.org/uploads/Development/PALMasterSystemIIICBDM4JrPAL-Component.jpg

653 posts

Ultimate Geek
+1 received by user: 20

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  Reply # 685978 14-Sep-2012 13:04




280 posts

Ultimate Geek


  Reply # 686050 14-Sep-2012 14:59 Send private message

Thanks mate.

That guide above looks very useful, I will have to check it out. I went out and bought 1x 75Ohm Resistor (but I didn't know what wattage to get lol) and 1x 220uF capacitor.

Hoping to try it out today.. not sure what will 'blow' if i do it wrong.. either the whole Sega unit, or just the resister/capacitor.






280 posts

Ultimate Geek


  Reply # 686087 14-Sep-2012 16:46 Send private message

Hey thanks again for that video guide, it was perfect!

Just finished it now, and I didn't screw it up! just as well you posted that video too, because the guide I found had the audio output completely different!

My local JayCar didn't have a white RCA port, so I had to use black.





Watchmaker Wizard
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  Reply # 698432 9-Oct-2012 14:32 Send private message

Very tidy job!

I did a vaguely similar mod on an old Xbox to add an RCA digital audio output and it was a pig of a job.






280 posts

Ultimate Geek


  Reply # 698656 9-Oct-2012 19:23 Send private message

I did the 50/60 Hz mod too:



and the LED Powerlight mod:







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