IRC log for #card10badge on 20190923

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00:18.33*** topic/#card10badge is Logix (Wiki): https://card10.badge.events.ccc.de/ git: https://git.card10.badge.events.ccc.de/card10 % current version: https://card10.badge.events.ccc.de/en/firmwareupdate/ % Display: https://www.aliexpress.com/item/4000018872259.html
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17:01.47sur5rIs there a known thing I can check when my card10 won't run from battery?
17:02.05sur5rThe battery voltage reads as 4.2V but it won't turn on
17:03.02q3k[m]schneider: any idea in which of the boxes I can find some inter-board/mezz connectors for the fundamental/harmonic board?
17:25.15q3k[m]i found one side on a huge-ass spool, still looking for the other
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19:01.40DocScrutinizer05sur5r: there are two methods I know of to power up the device: powerbutton and USB-plug-in event. Does your car10 start from the latter, and does it shut down or continue running when you pull the USB plug?
19:02.44sur5rit starts when plugging in an turns off when pulling the plug
19:03.53DocScrutinizer05sounds like battery isn't connected, or maybe the battery management thinks battery has a critical state, e.g. also from battery thermistor on PMIC
19:06.13DocScrutinizer05you could test pin16,17 BAT+ of B2Bconn on fundamental board
19:07.52DocScrutinizer05or on C201 fundam.
19:17.36DocScrutinizer05prolly soldering or otherwise attaching a probe wire to C201 is not all that difficult - compared to e.g. trying to test pin E3 (BATT) of PMIC
19:19.48DocScrutinizer05I'd start by checking the spring contacts in battery connector
19:20.42DocScrutinizer05they don't like any other wire than receptacle blade getting pushed in
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19:29.38sur5ras I said
19:29.50sur5rmicropython power module reports 4.2V
19:30.01DocScrutinizer05umm
19:30.49sur5rdisassembling/reassembling did not help
19:30.51DocScrutinizer05this doesn't ensire a connected battery, it might be the charger's voltage
19:30.58sur5rtrue
19:30.59DocScrutinizer05ensure*
19:31.12sur5rgot no multimeter in reach
19:31.29sur5rwill have to check tomorrow
19:31.45DocScrutinizer05cjeck proper seating of battery plug in receptacle
19:31.58sur5rits sitting pretty tight
19:32.07DocScrutinizer05then should be ok
19:32.27DocScrutinizer05no furher ideas on my side
19:32.59DocScrutinizer05check voltage on 16.17 on B2B, or on C201
19:35.19sur5rwill do
19:36.30sur5rharmonic has no intelligence on it, does ti?
19:41.42sur5ryeah yo are right... power.read_battery_voltage returns 4.something even with the battery disconnected
19:58.09DocScrutinizer05toldya :-)
19:59.09DocScrutinizer05missing DMM doesn't help it. Otherwise I'd suggest to test real battery voltage on the outer metal stubs of plug
19:59.44DocScrutinizer05might be a broken wire of battery
20:00.31DocScrutinizer05you *might* carefully short the blades in batt receptacle and then read out voltage
20:01.00DocScrutinizer05if it drops to zero, you may rule out any contact problems from PMIC up to batt conn
20:01.14DocScrutinizer05don't bend the blades!
20:02.37DocScrutinizer05after I tracked it down to battery, I'd treat the wires with needles and probe voltage there
20:04.35DocScrutinizer05wire acupuncture is a well known treatment ;-)
20:05.14DocScrutinizer05>>harmonic has no intelligence on it<< at least none related to power supply
20:05.38DocScrutinizer05the pulse oxi chip seems pretty smart ;-)
20:06.16sur5ryeah
20:06.21sur5rwill check in the lab tomorrow
20:06.27sur5rthanks for your ideas so far
20:09.49DocScrutinizer05yw
20:14.35DocScrutinizer05>>carefully short the blades in batt receptacle<< desoldering braid or the like may come in handy for that
20:15.42DocScrutinizer05or worst case a light alu foil "ball"
20:16.31DocScrutinizer05braided wire "brush"
20:20.33Woazboat<DocScrutinizer05 "you *might* carefully short the "> The card10 won't even run properly in that case. It'll detect the short as low battery voltage and shut down again immediately
20:32.08DocScrutinizer05Woazboat: that simplifies the test considerably :-)
20:34.38DocScrutinizer05no need to read out bat.voltage, just see if you can shut down the device by shorting the contact blades in batt receptacle
20:35.14DocScrutinizer05if yes then connection from batt conn to PMIC has to ne OK
20:35.27DocScrutinizer05to be*
20:37.09DocScrutinizer05which leaves batt con itself (blades bent) and battery incl wires and plug, and the NTC plus support birdseed sensing batt temp
20:38.34DocScrutinizer05I guess reading out batt temperature (according to NTC) should be possible?
20:39.34DocScrutinizer05bets on a detached wire on battery prot PCB
20:40.07DocScrutinizer05or prot fatal undervolt cutout
20:51.13DocScrutinizer05sur5r: did you run the device from battery till shutdown and then didn't recharge it for a while?
20:54.02DocScrutinizer05still should leave a maybe 0.5V margin from discharge end cutout voltage (oritective circuit in battery allows charging but no discharging) to cell absolute minimum voltage where prot considers cell dead and disables all battery charging for safety reasons
20:54.43DocScrutinizer05protective* circuit
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