Timeline for The mysterious case of the random leakage current
Current License: CC BY-SA 3.0
32 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Aug 1, 2016 at 8:58 | comment | added | KalleMP | Just to support what @JohnD said. I vote for light being more likely to affect the circuit than magnetic fields. If you ever want to you could try cover the LEDs with thick dark black cardboard or aluminium foil tape and see if you can achieve latch up. Then remove the magnets and wave them in and out of bright light and see if they might latch up. Also see if there are any unconnected pins that might pick up static charge though the aluminium case should protect from much of that. | |
| Jul 30, 2016 at 20:48 | comment | added | LorenzoDonati4Ukraine-OnStrike | @KalleMP Wow! Nice find! Thanks! Now I wish I could read Chinese! :-P :-) I didn't suspect it could have been an MCU, though. These little beasts are everywhere! :-) I fear we'll see some tiny MCU priced at the same level of a single PN2222 BJT one of these days! | |
| Jul 30, 2016 at 18:56 | comment | added | KalleMP | Looks like it is a clone of a popular 8bit uController. I must say it was not easy to find a datasheet. But here is a link to a OTP version of an EMP78P153S in Chinese (I think). You will need to cut and paste the link carefully, it has forward and back slashes "\", "/" - datasheet.hk/download.php?file=0406\hs108_4612284.pdf | |
| Jul 30, 2016 at 15:42 | history | edited | LorenzoDonati4Ukraine-OnStrike | CC BY-SA 3.0 |
added 31 characters in body
|
| Jul 30, 2016 at 13:02 | comment | added | Sascha | Mechanical stress of the PCB/assembly by the magnet? | |
| Jul 29, 2016 at 21:30 | history | tweeted | twitter.com/StackElectronix/status/759139048992739328 | ||
| Jul 29, 2016 at 21:03 | vote | accept | LorenzoDonati4Ukraine-OnStrike | ||
| Jul 29, 2016 at 21:03 | answer | added | LorenzoDonati4Ukraine-OnStrike | timeline score: 15 | |
| Jul 29, 2016 at 20:39 | comment | added | WhatRoughBeast | Bad battery holders? | |
| Jul 29, 2016 at 20:35 | comment | added | John D | Incident light on the LEDs? | |
| Jul 29, 2016 at 20:34 | comment | added | Olin Lathrop | +1 for a interesting question, but also because of pictures that were relevant, properly focused, and with the right crop to show what is needed but leave out what is not needed. This would be a good question to refer to for how to properly post pictures of circuits. | |
| Jul 29, 2016 at 20:27 | answer | added | Justin | timeline score: 15 | |
| Jul 29, 2016 at 20:19 | comment | added | LorenzoDonati4Ukraine-OnStrike | @mario No ESD problems. EMI? In a sense ... you are getting closer! :-) | |
| Jul 29, 2016 at 20:16 | comment | added | Mario | EMI problems? Sensitivity to ESD? | |
| Jul 29, 2016 at 20:08 | answer | added | Olin Lathrop | timeline score: 7 | |
| Jul 29, 2016 at 20:08 | comment | added | LorenzoDonati4Ukraine-OnStrike | @Mario. Nope. No accidental contacts of any sort. | |
| Jul 29, 2016 at 20:07 | comment | added | Mario | The protruding pins made contact with the back cover? | |
| Jul 29, 2016 at 20:06 | comment | added | LorenzoDonati4Ukraine-OnStrike | @Neil_UK. The cause is not really in the photos. As for RF pickup..., it is not the culprit. But you are coming a little closer...! | |
| Jul 29, 2016 at 20:05 | comment | added | LorenzoDonati4Ukraine-OnStrike | @Winny Oh, that is not significant. That PCB is the only one I've got left, and it is not in the best conditions. When I perform the dismantling I didn't even think I would post a question here, so I didn't keep them. | |
| Jul 29, 2016 at 20:04 | comment | added | Neil_UK | RF pickup? Can we see the cause in any of the pictures? | |
| Jul 29, 2016 at 20:02 | comment | added | winny | Even if it didn't cause it, one of the button solder joints looks broken. | |
| Jul 29, 2016 at 19:58 | comment | added | LorenzoDonati4Ukraine-OnStrike | @WhatRoughBeast Interesting theory! But not the real culprit! | |
| Jul 29, 2016 at 19:57 | comment | added | WhatRoughBeast | Whiskers (caused by incomplete etching) on the PCB, bridging traces? | |
| Jul 29, 2016 at 19:55 | comment | added | LorenzoDonati4Ukraine-OnStrike | @winny no solder joint issues either! | |
| Jul 29, 2016 at 19:54 | comment | added | LorenzoDonati4Ukraine-OnStrike | @Cheibriados no mechanical stress! | |
| Jul 29, 2016 at 19:54 | comment | added | LorenzoDonati4Ukraine-OnStrike | @winny No dirt issue! | |
| Jul 29, 2016 at 19:54 | comment | added | winny | Oh! Is the solder joint for the push button bad? | |
| Jul 29, 2016 at 19:54 | comment | added | Cheibriados | Was it related to repeated board flex/stress? | |
| Jul 29, 2016 at 19:53 | comment | added | winny | Dirt between plus and minus pads? | |
| Jul 29, 2016 at 19:52 | comment | added | LorenzoDonati4Ukraine-OnStrike | @winny Nope, unfortunately! | |
| Jul 29, 2016 at 19:52 | comment | added | winny | A bad capacitor? | |
| Jul 29, 2016 at 19:49 | history | asked | LorenzoDonati4Ukraine-OnStrike | CC BY-SA 3.0 |