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marcan42's profile
Hector Martin
Hector Martin
Hector Martin
@marcan42

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Hector Martin

@marcan42

If it ain't broke, I'll fix it! I'm porting Linux to Apple Silicon Macs at @AsahiLinux. http://patreon.com/marcan  | http://github.com/sponsors/marcan 

Tokyo, Japan
marcan.st
Joined May 2009

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    1. Alvaro‏ @alvaroprieto 30 May 2018
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      The temperature sensors seem to be ok. The error only shows up when I plug in the fans... Fans seem to be running ok, but maybe causing some other electrical issue. Error seems to be E-1 though, which indicates temperature sensor issue :-/pic.twitter.com/affKAZOm3N

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    2. Alvaro‏ @alvaroprieto 30 May 2018
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      Fans seem to run off the 10V rail, the AVR is on 5V. They pull about 115mA each (2 fans). At first I thought the 5V regulator was over-loaded, but now I’m not sure

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    3. Alvaro‏ @alvaroprieto 30 May 2018
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      Fans seem to be rated for 12V@200mA. The system has a 10V rail for those. Maybe whatever transistor is used to control the fans from the AVR is causing problems and pulling more than the AVR or the tiny 5V regulator can handlepic.twitter.com/k9jM2XyQA2

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    4. Alvaro‏ @alvaroprieto 30 May 2018
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      IC2 is the 5V regulator. Looks like they were planning to source more current and eventually went with a much smaller, cheaper partpic.twitter.com/iv431G7Fln

      1 reply 0 retweets 1 like
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    5. Alvaro‏ @alvaroprieto 30 May 2018
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      Forgot to mention that the 5V rail goes to ~4.6V with both fans on and ~4.8V with only one connected.

      1 reply 0 retweets 0 likes
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    6. Alvaro‏ @alvaroprieto 30 May 2018
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      Slowly figuring out how this works...pic.twitter.com/7aX8HoCFHw

      2 replies 0 retweets 5 likes
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    7. Alvaro‏ @alvaroprieto 30 May 2018
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      Looks like the 10V rail is also changing a bit. ~11.3V with no fans on, ~9.9V with one fan on. ~9.4V with both fans on. Doesn’t explain the 5V rail drop though

      2 replies 0 retweets 4 likes
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    8. Alvaro‏ @alvaroprieto 31 May 2018
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      Alvaro vs. The Fridge Day 2: Looks like @Warren__Parsons is onto something. Brought out the big guns to look at the power supplies when the fans are on. The "10V" rail is a mess. One scope shot with and one without fans. Time to look at the caps after the rectifierpic.twitter.com/UFHoW2Hldv

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    9. Alvaro‏ @alvaroprieto 31 May 2018
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      Found the capacitor in question. It's a 1000uF 25V electrolytic. The closest I have is a 470uF 25V (I have some 1000uF and 3300uF, but only rated for 16V and with the swings on that rail I don't want to mess with it) The extra 470uF seems to have fixed the problem!pic.twitter.com/9vLTySbvUu

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    10. Alvaro‏ @alvaroprieto 31 May 2018
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      When your 1000uF capacitor seems to have <1uF of capacitance, you might have a problem! I think we have a mystery solved! Now I just need to get a proper replacement cap and then see if the fridge actually works :Dpic.twitter.com/lxhgjsdfQl

      4 replies 0 retweets 15 likes
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      Hector Martin‏ @marcan42 1 Jun 2018
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      Replying to @alvaroprieto

      Bad caps. It's always bad caps. And when it isn't, the caps are bad anyway and just not causing a problem yet ;-)

      5:25 AM - 1 Jun 2018
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