| cde | so I just sold my M1R3, but I'm wondering if I should do the NOR fix by replacing the reset chip? | 09:52 |
|---|---|---|
| cde | (the new owner doesn't have electronics rework experience) | 09:52 |
| lekernel | https://ssl.serverraum.org/lists-archive/devel/2011-October/002505.html | 10:24 |
| lekernel | it's a bit complicated | 10:24 |
| cde | isn't it just replacing the three-legged reset chip with another one? | 10:34 |
| cde | oh right, I need to take 5V elsewhere | 10:35 |
| cde | http://downloads.qi-hardware.com/people/werner/m1/nor/d8/u24-to-5V.jpg #looks doable :) just need to buy the right chip | 10:36 |
| cde | lekernel: did you know that there is a new pink PCBs color? like http://www.grandideastudio.com/portfolio/jtagulator/ | 10:37 |
| cde | that would be very cool for mixxeo. also, consider adding rgb leds | 10:37 |
| cde | lekernel: besides the NOR flash fix, what are the fixes you'd recommend doing? | 10:46 |
| lekernel | mixxeo won't have a transparent case | 11:20 |
| lekernel | case design is super late, essentially because finding a good industrial designer is a pain | 11:21 |
| lekernel | actually, since last week, I've found one, except they are super expensive | 11:21 |
| lekernel | (fixes) removing the ferrite beads, as wpwrak already explained | 11:22 |
| lekernel | well those in the power supply are fine, but those between grounds aren't | 11:22 |
| lekernel | it's easy fixes though | 11:23 |
| lekernel | wpwrak, http://www.edn.com/design/automotive/4423428/Toyota-s-killer-firmware--Bad-design-and-its-consequences | 11:54 |
| lekernel | think you might enjoy this article =) | 11:55 |
| cde | thank you :) | 11:56 |
| wpwrak | interesting .. never saw "benign" used as a verb ;-) | 11:57 |
| cde | lekernel: so basically just bypass the beads on the 5V input? | 11:58 |
| lekernel | cde, no, near the video-in chip | 11:58 |
| lekernel | those on 5v are fine | 11:58 |
| lekernel | I'm not sure if they do much actually, but they don't cause trouble | 11:59 |
| cde | ok | 12:01 |
| cde | so far, video in has worked fine for me. however I only tested it with the CCD on the green input | 12:01 |
| wpwrak | the video bead causes ESD to run through the chip, crashing it. not recommended :) | 12:02 |
| cde | oh. so I guess I was very luck and could have damaged it any time through ESD | 12:05 |
| cde | but why would a bead cause ESD? | 12:05 |
| wpwrak | cde: it doesn't cause it. it just makes it worse :) the ESD will find you, don't worry about that ;) there are also other, ESD-like events, such as mismatched potential. i found mine when connecting to ... i think it was the stereo. a little surge went through ground. the bead deflected it and instead if harmlessly dissipating into the ground plane, it went through the chip. the chip hated that :) | 12:13 |
| wpwrak | luckily, it survived. had to power-cycle, though. | 12:13 |
| wpwrak | (toyota) nice :) i'd actually worry a lot more about the "regular" bugs than about the extra safety bits. | 12:19 |
| --- Thu Oct 31 2013 | 00:00 | |
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