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22:21 < mulenmar> Hey, TheSeven. Did you figure out that LCD issue?
22:21 < TheSeven> i can't do much about it without further details
22:22 < TheSeven> as long as you're using pre-r322 builds, the lcd driver should be known-working
22:22 < TheSeven> so this *might* be a hardware issue
22:22 < mulenmar> Probably.
22:22 < mulenmar> I think you suggested an electrical test with a multimeter at one point.
22:22 < TheSeven> but to figure out what's really going on, i need a better description of the lcd's behavior
22:22 < TheSeven> yes
22:23 < mulenmar> A voltage test or somehing between two pins, and it came back the "bad chip" result.
22:23 < mulenmar> Roughly.
22:23 < mulenmar> That's when I gave up on it.
22:23 < TheSeven> yeah, i still have no idea where that signal is coming from though
22:24 < TheSeven> (which is why i wanted to just try wiping it again with known-good code)
22:24 < mulenmar> And we couldn't get that to work.
22:24 < TheSeven> several other people had similar problems during the last months, which turned out to be the conseqence of a software bug, and that our wiper also wasn't working quite right back then
22:25 < TheSeven> i managed to fix all of those without any further problems once i figured out the bugs involved here, so i though it would be worth a try
22:25 < TheSeven> we can't really ruin it any further :)
22:25 < mulenmar> Yeah, but we tried wiping a few days ago, still nada.
22:25 < mulenmar> True
22:26 < mulenmar> It is . . . FOR SCIENCE!!!
22:26 < mulenmar> *insert creepy laugh*
22:26 < TheSeven> IIRC you couldn't manage to actually trigger wiping
22:26 < mulenmar> Yeah
22:26 < TheSeven> (looked like emBIOS was locking up during boot for some strange reason)
22:27 < mulenmar> I don't think so -- the firmware would load fine, just the screen is getting corrupted.
22:27 < TheSeven> so one of the questions is if this might be related to the lcd problem in any way
22:27 < TheSeven> i.e. is it a software problem or a hardware problem, and if the latter, inside the SoC or LCD
22:27 < mulenmar> Well, the LCD problem didn't used to occur, before it was sitting out for a few months out of the metal shell.
22:28 < mulenmar> So I figure it's a hardware problem at *some* level.
22:28 < TheSeven> the interesting question is if that could block embios from booting correctly
22:29 < mulenmar> Well, the corruption occured when the DFU was loaded.
22:29 < mulenmar> Before that, the screen is off.
22:29 < TheSeven> yep
22:29 < mulenmar> The firmware (.bin file) still loaded fine.
22:29 < mulenmar> But we couldn't wipe after that.
22:30 < TheSeven> ...which tells me that embios (the bin file) didn't boot quite right
22:30 < mulenmar> OR something is related to the broken-off Hold switch.
22:30 < mulenmar> An expected resistence missing?
22:30 < TheSeven> as this might well be related to lcd problems, i'm wondern what the lcd corruption looks like exactly, if there's some kind of fading involved, and if it always produces the exact same lcd contents
22:31 < mulenmar> Fading yes, exact same contents no.
22:31 < TheSeven> the hold switch shouldn't affect this kind of things
22:31 < mulenmar> The contents depend on what screen was displayed.
22:31 < TheSeven> and fading tells me that the lcd itself seems to have gone faulty
22:31 < mulenmar> i.e., the corruption filles only the columns where the letters would be in the emBIOS screen.
22:32 < TheSeven> oh?
22:32 < mulenmar> But they appear and are visilble for a couple seconds while the verticle bars fade in.
22:32 < TheSeven> so it's not consistent across the full panel but dependent on the data?
22:32 < mulenmar> Yeah, that's what was happening.
22:32 < TheSeven> very weird
22:33  * TheSeven wonders how an LCD can break in such a strange way
22:33 < mulenmar> When the firmware was loaded, every column was black except the right-most, which had a 1px red line
22:33 < TheSeven> hm, the first message (embios loader version) is written at the same time as the background
22:34 < TheSeven> i'm not sure about the "loading embios" message right now
22:34 < TheSeven> does this already affect the fading pattern?
22:34 < TheSeven> and as soon as you run the bin it goes completely black with that red line on the right side?
22:36 < mulenmar> Columns of black, with 1px white between them. The black columns are where the letters were, and are as wide.
22:36 < mulenmar> When I load the bin, the new columns fade in as well.
22:36 < TheSeven> so you're basically saying that it's duplicating like the last pixel row of the text across all rows?
22:37 < mulenmar> No, it's columns (vertical) of black replacing where the text is.
22:38 < mulenmar> Each black bar is one letter wide.
22:38 < TheSeven> hm, so the darkest pixel of each column wins?
22:38 < mulenmar> With the bin file, yea.
22:39 < mulenmar> The exact description of the columns for just the DFU is more complicated
22:39 < mulenmar> I'd need to make a video to show it accurately.
22:39 < mulenmar> But there, there are coloured liness betewen most of the black columns.
22:40 < mulenmar> And on the left, there is just white -- and on the right, but twice as wide.
22:40 < mulenmar> But NOT where the "Loading emBIOS" letters were.
22:40 < mulenmar> Isn't there something else written to the screen besides "Loading emBIOS", first?
22:41 < TheSeven> yes, there should be the embios loader version string at the top left corner
22:41 < mulenmar> The corruption starts there, only one or two horizontal lines tall (but the columns are still vertical
22:41 < mulenmar> And then shifts over with the fade
22:42 < TheSeven> hm, very obviously an lcd-internal problem
22:42 < mulenmar> And then grows, and becomes the top-to-bottom black columns with coloured lines between them and white space on either side.
22:42 < mulenmar> Yeah, that's what I had figured.
22:42 < TheSeven> (which shouldn't affect operation on the SoC side at all, the LCD is driven in kind of a "fire and forget" manner)
22:42 < mulenmar> Yeah
22:42 < mulenmar> And if we could get Rockbox to load, there are voice files anyway.
22:43 < TheSeven> i'm wondering why embios fails to boot
22:43 < mulenmar> So the issue is that stupid flash chip and my not being able to wipe it.
22:43 < TheSeven> is the lcd still visible enough to determine if ther was some crash message on it when embios booted?
22:43 < mulenmar> If emBIOS didn't boot, we wouldn't be able to load the firmware, right?
22:43 < mulenmar> Isn't the DFU emBIOS?
22:43 < TheSeven> you're mixing up things
22:43 < mulenmar> Er, embiosldr
22:43 < mulenmar> My bad. *facepalm*
22:44 < TheSeven> DFU is the mode it comes up in, with the black screen
22:44 < TheSeven> embios loader (which loads embios) is the second stage, where you just described the corruption
22:44 < TheSeven> emBIOS itself is the operating system kernel that runs e.g. iloader, and would do the wiping
22:45 < mulenmar> And this mess is why I bought a Sansa. 8~P
22:45 < TheSeven> if you load the bin file very quickly after loading the dfu file (before the lcd has a chance to fade), does it immediately go black?
22:45 < mulenmar> I'll check
22:48 < mulenmar> I'm getting an "Exception: Could not find specified device (generation = 0)" error, I'm guessing I didn't type the right command.
22:48  * mulenmar scrolls back to find the right command
22:49 < TheSeven> at which point?
22:50 < mulenmar> Nevermind, I was using the wrong script
22:50 < mulenmar> Oh come on, the corruption is different now?!
22:50 < TheSeven> hm, thermal or connection issues?
22:51 < mulenmar> Different pattern, still vertical lines, already checked for those.
22:54 < mulenmar> Or not. I just messed with it a bit, trying to get the cable loose and reset it. Failed, but now the corruption is fainter.
22:55 < TheSeven> aha... maybe some clock line or contrast voltage not being supplied properly due to zif connector trouble?
22:56 < TheSeven> does a bit of pressing on the zif connector's latch help?
22:58 < mulenmar> Just gets it back the way it was, with the columns.
22:58 < TheSeven> hm
22:59  * mulenmar completely unplugs the LCD and tries to plug it back
23:00  * mulenmar hears "Oh god, not yet man!" from somewhere
23:00 < mulenmar> jk
23:01 < mulenmar> Yeah, that didn't help either.
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23:30 < mulenmar> It doesn't really tell us anything, but I'm now hearing that electrical buzzing on USB access while something else is connected to USB, so that's not related to my nano2g. 8~/
23:33 < TheSeven> probably related to CPU voltage regulator load
23:33  * TheSeven needs to go to sleep, but still wonders what might be causing embios to fail booting
23:43  * [Saint] has a suspicion that the LCD may in fact be fine, and is just getting complete garbage info from a damaged/broken <something_else>
23:44 < [Saint]> I have known several people who have damaged their Nano2Gs by manipulating the mainboard while outside of the case with the battery still connected.
23:44 < [Saint]> Perhaps you accidentally fried something :/
23:44 < TheSeven> [Saint]: the panel driving is done by the controller chip on the lcd itself, so if there's some fading action while there's nothing being written to the lcd controller, i don't know what else should be the cause
23:45 < [Saint]> Hmmmm...it's a tricky one.
23:45 < [Saint]> This Nano justwent into self-destruct :/
23:46 < mulenmar> Steve Jobs must have gotten word of it, and used his Turtleneck Powers
23:46 < mulenmar> 8~P
--- Log closed Fri Dec 17 00:00:31 2010