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I was thinking that might be the case, but was hoping it wasn't the top board :( The exact same issue is across all 4 slots - is that still likely to be the top board?

Video of the issue View: https://youtu.be/eowbxSbDvTI?si=hg8dRC3vAHOlkJ9m

Hi all, I have a Neo Geo MV4 with what I believe is corrupted music - I do get some music but it sounds like I am missing a channel in some games, and when those channels do kick in all I get is a very loud stacticky version of what I should be getting. Neo Geo tune is fine, sound effects are...

If anyone in SE QLD is interested I am giving away a Panasonic CRT Model: TX-29FJ50A Size: 29”/68cm It has convergence issues in the bottom right quarter of the screen and the power button doesn’t work, but it does have a great picture especially over component. Great TV for later consoles...

I've cut into a couple of mine by accident while cutting down to size and mine are definitely dual wipe

Just resoldered everything again - the programmer side was just used to program a C ROM that verified fine so should be ok MD5 verification failed upon dumping the V ROM I just programmed. Going to run the PROG command again I guess

I've just programmed the V-ROM and the verify is giving infinite errors. Time to dump and check MD5 I guess

Indeed. I am not worried if it says 1 error, but when I attempt a dump and the error count immediately goes up into the millions - something is not connected I got the V ROM mounted onto a board now and it had E:1 on the Test V-ROM page but I'm dumping it now and 0 errors so far. Checksum was...

Just dumping one now to try it - but I think I've got it After I soldered the headers onto the daughterboard, I have hit them with hot air to make sure the solder has flowed to all through holes fully - this time on the board I previously got an error checksum, I have the correct checksum and...

I also used ack’s so likely a manufacturing issue All good, the dual ones are working fine and I can cut them down to make single boards I’ve ordered a whole new cart to do this properly. I’m just going through the process on the one I ruined so I don’t make the mistakes on the new one, or if...

Not quite, still getting errors when trying to dump or program. But getting closer at least The single daughterboards I made didn’t have holes on all 4 sides Not sure if there was a manufacturing issue or if the design I used has been improved but having checked these against the dual boards...

I think I can explain why we are having opposite issues. I just pulled out one of the dual daughterboards and all 4 sides have the castellated holes. On the single chip repro daughterboards 2 sides have these and 2 sides have very tiny pads I might try a dual daughterboard and see if I get a...

Yes I found that problem, I've been trying to use drag soldering with a big blob on a larger tip and loads of flux, but it's not filling the castellated holes and I don't seem to be getting a good connection at all. Zooming in on photos I appear to have a connection, but when checking with a...

I was running a higher temperature since the holes are so small, but I have reduced this down now due to losing all of the pads on my attempts What you are doing is exactly what I am doing, but some pads just WILL NOT read a connection even when it looks like a solder bridge is present, I'm at...

I have managed to get my S1 chip reconnected with a bridge wire and this is now programmed so I am all ready to go except for the C ROMs For anyone that has done so, what is the best way to attach the C ROM chips to the daughterboards? I've got them removed from the original daughterboards but...

You just need to proceed with known defects, Vortex mentioned this earlier - then you need to push the castellated holes into the grooves on the PCB to prevent bridging

If you don’t need to verify stuff often, buyicnow is very reasonable for burning EPROMs/EEPROMs - I think they charge 0.50 per IC

The Wellon are quite good too. I would have bought a Wellon if the SuperPro hadn’t come up when it did

I second the Xeltek. I have the older SuperPro 280U and it does everything I throw at it. They are a bit more expensive but if you do a decent amount of ROM programming/verifying (I think most of us do) they pay for themselves quickly They do come up secondhand on eBay from time to time as...

It’s insurance. What if the memory fails and the game code is lost? The owner can still have the game repaired