18-08-2015, 11:18
I imagine the point asking for SCK/MOSI together is to see that the clock and data lines are in sync and such. Easy enough to do, but I'm not sure how informative that would be.
I'm open to any possibility, really. I hadn't particularly considered the possibility that the TFT could be faulty, but I guess it's just as likely as anything else (and I had no idea the DOA rate was that high). While I've been trying to figure this out, the behavior has changed--now it's just solid white (when I apply power, the screen turns on solid white for a second or so, then goes black for a second or so, then goes back to solid white and stays that way). I've tried a new set of wires, but I'm still waiting for a shorter set.
I've been focusing largely on the WD board because (1) I built it, can replace most of the parts on it if necessary, and may well have made a mistake, and (2) I have access to a resource (i.e., you) that knows how it's supposed to work and can help in troubleshooting. It's also the part that I believed I had the best chance of being able to fix quickly, rather than waiting for something else to ship from China. But with all of that said, I think it's looking increasingly unlikely that the problem lies there. I'll see if I can find a replacement on eBay from a vendor that can ship quickly.
I'm open to any possibility, really. I hadn't particularly considered the possibility that the TFT could be faulty, but I guess it's just as likely as anything else (and I had no idea the DOA rate was that high). While I've been trying to figure this out, the behavior has changed--now it's just solid white (when I apply power, the screen turns on solid white for a second or so, then goes black for a second or so, then goes back to solid white and stays that way). I've tried a new set of wires, but I'm still waiting for a shorter set.
I've been focusing largely on the WD board because (1) I built it, can replace most of the parts on it if necessary, and may well have made a mistake, and (2) I have access to a resource (i.e., you) that knows how it's supposed to work and can help in troubleshooting. It's also the part that I believed I had the best chance of being able to fix quickly, rather than waiting for something else to ship from China. But with all of that said, I think it's looking increasingly unlikely that the problem lies there. I'll see if I can find a replacement on eBay from a vendor that can ship quickly.