Recovering Raspberry Pi 3s
February 10, 2023, 20:58
isopropylalcohol
yes i do
great!
do you know how to do sizzle test?
no i do not
basically...
power pi up, coat board with small ammount of ipa
and look what sizzles.
isnt ipa conductive?
nope
oh
ok
IPA is used to clean electronics.
yes i have 99.9% procent
IPA has low boiling temp, so when you apply it on your board, you will see what's heating up
i use it to clean my 3D Printer
because it will basically boil that IPA - sizzle
yep 🙂
yes but my board stays cold even when powered up for 20 mins
i just did the same with mine
every component ?
yep
ill try it anyways
well
you have short somewhere...
yea
i noticed
on 3V3 rail.
basically main power rail for pi...
from which every other voltage is derived from
yea
so very small change ill be able to safe it?
you might be lucky and it might be only shorted capacitor, but it is unlikely...
and yes, i just read your mind.
well ok
let me try the same on the other boards
mhm
by any chance, do you have FLIR?
i dont have a heat camere no
that would be better than IPA sizzle...
yea im not rich sadly enough
you know, you'd see that heating component instantly..
yeee
ill do the sizzle see what heating
if anything is
ye...
did the sizzle test
and nothing on both colder then rocks
that short is too hard, it might be U3 itself
i think its the pimc
the chip
so it wont produce voltage at all
yep
do you have lab bench psu ?
which wont make the components heat up
yes
it can suplpy 80v
dont......
1V
hahaha
and then
pump 1V into 3V3 line
see what heats up.
0.9 would be better tho
i can do that
pump it in the gpio 3v3?
althrough on pi3 VCORE is derived from 5V
or PP8
that would be better
ok let me get setup real quick
shower time for me
slright no problem
so real quick push 0.9v into the pp8 pad right?
and then what happens magic smoke?
yep
no smoke should escape, but something should sizzle.
i get a short on my ps
yep
the little cc led light up which indicates a shorty
i would pump ... 1A into it.
short*
ok
still shorting
yep
1V 1A = 1W
1W WILL heat something up.
its not heating anything
because my power is stopping the power delivery because it notices the short
so
idk what to doo
you cannot force your PSU to deliver 1A?
sadly not
then i cannot help you
understandable
im quickly gonna look in the manual
i have this psu