820-01987 - 5V @ 245mA. Water damage around hall sensor. Boots ok on batt?

down1nit

Member
PP1v8 was shorted due to internal board short i THINK I successfully resolved. 1v8 is present and stable. Damage was extremely localized thankfully. I think that's all good, hall sensor isn't even populated right now, i plan on running wires, not using internal traces.

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Its behavior now: First time inserting, 5V... pull it out and reinsert it's instantly 20V. Only when battery is connected do I get 20V, but only after I do a reinsert, so it's negotiating with something. Stays at 5V with no battery. I have reason to believe it works fine on a charged battery. Seems like bad 3217s, right?

I replaced the u7000 from a 01987 donor. I tested for DFU over and over again, and it just shows up as Macintosh no matter the keypress timing blah blah

I did order and replace the CD3217s from a 01987 today. I don't know if they're legit but they're acting the same as the originals. I still have the original CD3217s. I have the original u7000 too. Maybe the originals are working OK since this behavior was the same before and after replacing the CD3217s.

PPDCIN 5V PPBUS 12.3 @ 0.245Awhen on adapter / PPDCIN 20V PPBUS 12.57 @ 0.00014A when battery connected. PPBUS is present when adapter is removed, so it switches to battery power OK. It's just a dead battery. I'm gonna start manually charging the battery if i can, as I suspect the board boots fine on battery, which can let me get data.

I had normal voltage on CPU and SSD when I pressed power button, just didn't have display connected and it died. Please help me I'm so confused here. Why won't this dumb battery charge? Shit is it a bad battery?
 

down1nit

Member
1v8_slps2r is present in all the places I expect it to be. : I measured on pin 27 of j6600 and both the cd3217s. Any other ideas? It should get 20v without a working battery right?

Found the battery flex copper was split, so i replaced it too but still no love.
 

down1nit

Member
Going through power on sequence, everything is present seemingly until
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.
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PMU_Active_Ready : 1.8V
pp3v3_g3h: 3.24V
"<Calpe VOUT_RTC internal switch opens>"
p3v3main_pgood: 0v

Is this a T2 thing? Should I keep messing with DFU? Flash the t2 rom?
 
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