SFC graphical issues(video included)

Ok, I checked the schematic again and it seems to only call for CD4021B and SN74LVC245AN not MCP23017. Am I missing something?

 

Well refound the main page and searched for the chip. I'm guessing that's the V2. I'll be ordering one and just need to figure out how to diagram it up I guess.

 

So got all my stuff in and did the test cart. Failed electronics test. Everything else was good.

 

This is the result of running the burn-in test which I only realized today was the verbose hardware test.
I'm guessing this means the problem is connected to my VRAM then? I'll be getting a multimeter tomorrow for testing continuity and such so if anyone has any tips where to start that would be helpful. A visual inspection of the board showed no obvious signs of damage.

 

Sorry, I know it's been some time and you may have already solved your issue, but in case you haven't I just wanted to say it's most likely not the VRAM. That almost never fails. When you get a result like this that says "VRAM FAIL" on the burn-in test it's one of the PPUs that's bad. Try replacing PPU2. If that doesn't help, then try PPU1. It's definitely one or the other, though I'm not knowledgeable enough to be able to tell which.

 

It's a lot easier try to replace or test the VRAM first. Also the VRAMs should be very easy to test if you get a SOIC to DIP adapter. They're standard 62256 SRAMs.

Something like this: http://www.nkcelectronics.com/soic-to-dip-adapter-28pin-5p.html

A broken trace could give you such a fault, too. So, before go on a part replacing spree, check the traces so you don't waste your time reworking the QFPs needlessly.

Heck, it even tell you which of the chips failed (LOW).