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17:01.47 | sur5r | Is there a known thing I can check when my card10 won't run from battery? |
17:02.05 | sur5r | The battery voltage reads as 4.2V but it won't turn on |
17:03.02 | q3k[m] | schneider: any idea in which of the boxes I can find some inter-board/mezz connectors for the fundamental/harmonic board? |
17:25.15 | q3k[m] | i found one side on a huge-ass spool, still looking for the other |
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19:01.40 | DocScrutinizer05 | sur5r: 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? |
19:02.44 | sur5r | it starts when plugging in an turns off when pulling the plug |
19:03.53 | DocScrutinizer05 | sounds like battery isn't connected, or maybe the battery management thinks battery has a critical state, e.g. also from battery thermistor on PMIC |
19:06.13 | DocScrutinizer05 | you could test pin16,17 BAT+ of B2Bconn on fundamental board |
19:07.52 | DocScrutinizer05 | or on C201 fundam. |
19:17.36 | DocScrutinizer05 | prolly 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 |
19:19.48 | DocScrutinizer05 | I'd start by checking the spring contacts in battery connector |
19:20.42 | DocScrutinizer05 | they don't like any other wire than receptacle blade getting pushed in |
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19:29.38 | sur5r | as I said |
19:29.50 | sur5r | micropython power module reports 4.2V |
19:30.01 | DocScrutinizer05 | umm |
19:30.49 | sur5r | disassembling/reassembling did not help |
19:30.51 | DocScrutinizer05 | this doesn't ensire a connected battery, it might be the charger's voltage |
19:30.58 | sur5r | true |
19:30.59 | DocScrutinizer05 | ensure* |
19:31.12 | sur5r | got no multimeter in reach |
19:31.29 | sur5r | will have to check tomorrow |
19:31.45 | DocScrutinizer05 | cjeck proper seating of battery plug in receptacle |
19:31.58 | sur5r | its sitting pretty tight |
19:32.07 | DocScrutinizer05 | then should be ok |
19:32.27 | DocScrutinizer05 | no furher ideas on my side |
19:32.59 | DocScrutinizer05 | check voltage on 16.17 on B2B, or on C201 |
19:35.19 | sur5r | will do |
19:36.30 | sur5r | harmonic has no intelligence on it, does ti? |
19:41.42 | sur5r | yeah yo are right... power.read_battery_voltage returns 4.something even with the battery disconnected |
19:58.09 | DocScrutinizer05 | toldya :-) |
19:59.09 | DocScrutinizer05 | missing DMM doesn't help it. Otherwise I'd suggest to test real battery voltage on the outer metal stubs of plug |
19:59.44 | DocScrutinizer05 | might be a broken wire of battery |
20:00.31 | DocScrutinizer05 | you *might* carefully short the blades in batt receptacle and then read out voltage |
20:01.00 | DocScrutinizer05 | if it drops to zero, you may rule out any contact problems from PMIC up to batt conn |
20:01.14 | DocScrutinizer05 | don't bend the blades! |
20:02.37 | DocScrutinizer05 | after I tracked it down to battery, I'd treat the wires with needles and probe voltage there |
20:04.35 | DocScrutinizer05 | wire acupuncture is a well known treatment ;-) |
20:05.14 | DocScrutinizer05 | >>harmonic has no intelligence on it<< at least none related to power supply |
20:05.38 | DocScrutinizer05 | the pulse oxi chip seems pretty smart ;-) |
20:06.16 | sur5r | yeah |
20:06.21 | sur5r | will check in the lab tomorrow |
20:06.27 | sur5r | thanks for your ideas so far |
20:09.49 | DocScrutinizer05 | yw |
20:14.35 | DocScrutinizer05 | >>carefully short the blades in batt receptacle<< desoldering braid or the like may come in handy for that |
20:15.42 | DocScrutinizer05 | or worst case a light alu foil "ball" |
20:16.31 | DocScrutinizer05 | braided wire "brush" |
20:20.33 | Woazboat | <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 |
20:32.08 | DocScrutinizer05 | Woazboat: that simplifies the test considerably :-) |
20:34.38 | DocScrutinizer05 | no need to read out bat.voltage, just see if you can shut down the device by shorting the contact blades in batt receptacle |
20:35.14 | DocScrutinizer05 | if yes then connection from batt conn to PMIC has to ne OK |
20:35.27 | DocScrutinizer05 | to be* |
20:37.09 | DocScrutinizer05 | which leaves batt con itself (blades bent) and battery incl wires and plug, and the NTC plus support birdseed sensing batt temp |
20:38.34 | DocScrutinizer05 | I guess reading out batt temperature (according to NTC) should be possible? |
20:39.34 | DocScrutinizer05 | bets on a detached wire on battery prot PCB |
20:40.07 | DocScrutinizer05 | or prot fatal undervolt cutout |
20:51.13 | DocScrutinizer05 | sur5r: did you run the device from battery till shutdown and then didn't recharge it for a while? |
20:54.02 | DocScrutinizer05 | still 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 |
20:54.43 | DocScrutinizer05 | protective* circuit |
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