February 24, 2019 at 4:55 PM #25382
I got a Tim Worthington NES RGB board and followed the instructions to install it. This is my first NES RGB install. I am getting a black screen when using the OSSC.
– The OSSC recognizes the signal when I turn on the NES.. but there’s a black screen.
– I am using this 8 pin din to SCART cable – Cable
– I have tested sync using both c-sync and composite video sync (both black screen)
– I have performed the three tests that Tim Worthington described HERE, and all were successful showing no issues
– I have tested on multiple TVs, a Samsung UN55MU6290 and a Vizio M60C3 (both work with RGB modded SNES via OSSC).. both, black screen
– I have confirmed and double confirmed that the 8 pin din connector is wired correctly and confirmed I am getting signal from the NES RGB board all the way to the pins on the scart end of the cable with the following results:
Wire/pad on NES RGB board | Scart pin
– I have tried the different settings listed HERE, trying 256×240 optimal sampling mode for line double and triple… still, black screen
– THE NES OUTPUTS VIDEO FINE VIA RF (I still have RF hooked up)
– I have pads J3, J5 and J8 (75 ohm sync, rather than TTL – although I have also tried TTL with the same result) bridged on the NES RGB board.
What am I missing? Is it something to do with the cable/resistors/sync?
Edit: I did fudge with some capacitors on the board (see pic below) (I removed the three bigger based on a recommendation from a https://youtu.be/-MuwkiV4aPs?t=1215 that I ended up thinking didn’t apply to my cable (can someone confirm?)… and one (the smaller one in the upper right) because I broke it off on accident). At any rate, I put all the capacitors back on and tested them for continuity from both ends of each capacitor.. and all checked out. Any other test I can do to confirm these capacitors aren’t borked?
Edit #2: I know my wire solder connections look like crap… I have been hastily moving them around while trying to test but can confirm they are working as is. I plan to solder them nicely to the pads at a later time.February 24, 2019 at 5:19 PM #25389HarrumphParticipant
Maybe easier to get help in the shmups forum thread
shmups.system11.org/viewtopic.php?f=6&t=47617February 24, 2019 at 6:46 PM #25390
Thanks Harrumph, I actually did make a post there yesterday but it is waiting on a moderator to approve it because I just made a new account.
Was really trying hard to get this knocked out this weekend, but I might just have to wait for the mod to approve my post. In the mean time, if anyone here has any thoughts I’d appreciate it.February 24, 2019 at 10:36 PM #25395
Dumbass award of the year award over here… I decided not to do a palette switch for the moment and so skipped over that section in the instructions… turns out I had to bridge a few pads together when not using the palette switch!
Works great now!! wooo hooooo
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