neogeo
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NewHome › Forums › OSSC, OSSC Pro and DExx-vd isl › OSSC – Discussion and support › neogeo
jcoelho.would the 5v be dangerous should I add a resistor?
Yes, using the resistor is highly recommended. Unlikely that you’d fry your unit feeding it TTL but it’s somewhat out of spec and could cause damage over time.
Anonymous
I’m curious – it looks like the audio is routed via RCA cables, and not going through the SCART connector? How will you handle the audio transmission?
You should be able to get sync normally from composite or luma, right?
Audio can be added into SCART with an injector/breakout shim, assuming it’s fully wired, or can be routed around the OSSC (which would be necessary for <=1.5 OSSCs anyway.
Okay I will try that
Just says no sync
Anonymous
Looking at the mod instructions, my mind immediately goes to the part about cutting traces. You probably already have, but the first place I would look is making sure only the traces that are supposed to be cut have been cut, and that the cut traces are completely severed. Mutlimeter continuity check on the cut lines to make sure there is no continuity, and multimeter check on any nearby lines to make sure they still have continuity.
Not sure why its off
Anonymous
Check for continuity between the pin with white wire/black tape to each of the pins with the yellow wire bridge? (Probably implied that you already did, but just double checking) Also, check for continuity from each of the 3 pins to ground?
Csync should go to SCART pin 20. But, you won’t get continuity from end to end if there are resistors, caps, etc along the path. You may have to open visually trace it out.
ill recheck
AV/ Yellow RCA at the same time
However, only the CSYNC/Resistor/White wire will have continuity with the ground.
CSYNC should not have continuity to ground (when the RGB cable not connected). Redo the mod until its not shorted to ground.
Maybe i’m testing this wrong? Bad chip?
So with CSYNC continuity to ground you mean 0 Ohm resistance right?
To make sure the CSYNC RGB cable actually works, try bridging the CSYNC pin you cut back to the composite video pin to see if you get sync with the OSSC.
thank you
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