all right so today we're working on a 80
1707 MacBook that appears to not be
turning on we take a look on the desk
you'll see that it's taking 100 70
milliamps at 5 volts it stuck at 5 volts
and the chip that's going to allow the
charger to speak to the MacBook and back
and forth and turn off the ultrasonic
so as can be seen here it's taking 200
milliamps and it's at 5 volts this
typically means that the chip that's
responsible for speaking to the USBC
charger and saying hi on 20 volts not 5
volts is either dead or not getting
power and on this board that is our cd32
15 so this over here is our charge port
C charge port charge port and this
charge port is going to speak to the CD
32 15 and you got some stuff going here
on pin 6 see that look at that
see it talks to the CD 32 15 and this
chip over here is called the USBC MUX
chip and it's going to be powered on v
end voltage in that goes over here at a
pp 3 V 3 underscore g3 huh let's see if
T P 3 V 3 underscore g3 hunters presence
[Music]
yeah Kevin
[Music]
okay [ __ ] [ __ ] with my head
that's your eyes so the first thing
we're gonna have to do here is see if PP
3v3 underscore g3 Han is present let's
see if P P 3 V 3 underscore g3 heart is
present and if that's gonna allow this
trip to power on so we're gonna turn on
Paul Daniels as software we're gonna put
it on the screen and we're gonna measure
and see if P P 3 V 3 underscore g3 on is
present now according to our schematic
and board view P P 3 V 3 underscore g3
Han can be found on this capacitor right
next to the chip so let's see if that's
there one point one volts oh one point
one volts on PP 3 V 3 g3 hot do you ever
seen that one volt and let's see if
there's a short 10 kilo ohms no short
all right time to go over to the place
the pp 3 V 3 under store z3 hot is
created and see if there's anything
wrong with the creation circuit that's
keeping this from working
now what reason I'm skipping past here
is because all these things I'm looking
at is peepee 3v3 underscore g3 hot going
into something I need peepee 3v3 g3 hot
coming out of something here we have it
on you 69 Oh 3 so the enable is gonna be
present on pin 10 let's make sure enable
is present yeah turn back to voltage
mode all right so the enable is 5 volts
so it the chip is being told to turn on
but it's only putting on 1 volt hmm
that's odd now we've got 5 volts coming
in the diodes gonna decrease it a little
bit which is expected and understandable
now in rare cases the diode is actually
decreasing currents at the point where
this can't work but I'm not sure if
that's what's quite happening here so
let's say I think that it's only going
to give us the full 3.3 or so once it's
had a second let's start up and go to 20
now here's something interesting so
right by one of those CD 32 15s what I
see is corrosion nasty filthy awful
corrosion so let's see what happens if I
use a little bit of flux small amount
not too much just a reasonable amount
you know same amount that we Paul would
suggest that we usually use maniac
loded tick Paul that's the amount of
flux that you should be using you work
for a company that sells flux we have a
lot of moving expenses coming up $25,000
security deposit probably 30 to 50,000
in construction costs moving costs
furniture we need to sell a lot of flux
Paul do you know many tubes of this we
need to sell exactly exactly
[ __ ] did I leave the mic on for that you
got to show what you got a show to make
money am i right Nord VPN folks go to
Nord VPN comm slash [ __ ] influencer
and enter code [ __ ] influencer
the stream was brought to you by
authentic Ametek flux
genuine Amtech flux Apple Authorized
in certified Ametek flux now actually
Apple off has a certified
all right so we're using 800 milliamps
now at five volts which is departure
from what we had before
now nothing I want to check here is that
cap that look nasty was on a different
PP 3v3 underscore g3 RL do that seems to
come out of the CD 32:15 itself
point three
hmm
when what happens if we change our CD
32:15 let's change this chip with
another one
well then it's a lot of shorts under
that [ __ ]
what's your Halloween costume I am don't
honestly I didn't have time to think
about a celebrate Halloween Thank You JP
but I have no Halloween costume
nobody here did this year actually 2013
I remember everybody here dressing up
for Halloween
posting a picture all right let's get
ourselves another CD 3215 from stored on
Rosslyn group.com
spend it no more running away
am i cleaning the peepee says Vermillion
perhaps okay we're back to one point
four vaults on P P 3 b3 5 volts there is
the 5 volts actually coming into the
chip 4.7 now sometimes what happens is
this diode is actually limiting the
current a little too much so it doesn't
produce what it's supposed to which
could be happening here never know so I
am going to replace both we replace that
diode right now just in case that's
what's going on here committee I got my
80 page newly's today and we are gonna
go through it at the speed you would
imagine for an 80 pages
oh look now we get 20 volts check it out
see 20 volts so let's go over what was
going on here so was that cap that was
mildly corroded that I was ignoring
because I'm a dumbass second stream in a
row last day where I've done something
stupid but it might as well show you so
that you learn from it it doesn't do you
any good if I hide the videos where I'm
an idiot so let's go over this now this
cap over here was corroded and I
stupidly replace this chip which
probably did not need to be corroded
this camp is for PP 3 V 3 underscore UPC
X al do so what's that pp 3 V 3 UPC x al
do is a sub R L of pp 3 B 300 square G 3
hot most likely now this comes out of
the CD 32 15 as you'll see over here see
that's our CD 32 15 chip and it comes
out of here now when I measured pp 3 B 3
underscore G 3 hot to see if there was a
short on it when it was only putting out
1 point 4 volts rather than 3.3 volts I
noticed that there was no short-circuit
however when I turned the machine on the
rail was being brought down why because
the CD 3215 is not going to give people
a V 3 underscore G 3 hot a pathway to pp
3 V 3 underscore youth DC underscore XA
underscore L do until the machine turns
on only when the CD 32 15 turns on do
you have pp 3 V 3 underscores G 3 hot 2
PP 3 V 3 u PCX al do and once that
happens then is gonna be a low
resistance to ground however I can't
measure resistance to ground when the
machine and its of itself is off delete
that I can't measure resistance to
ground when there's power going through
so there's no way I would ever be able
to find that by measuring I would not be
able to see that that short is there on
P P 3 V 3 underscore g 3 on until
there's power going through it and once
this power going through it I'm not
going to be able to measure because the
CD 3215 needs to be powered on to give a
pathway between P P 3 V 3 underscore g 3
huh and P P 3 V 3 UPC XA L do
so that is why this wasn't working
because P P 3 be 300 G 3 husband to 15
was giving the Baro a pathway between p
b3 b3 underscore g3 hot and it shorted
subarray laughs EP 3 b3 UPC XA l do that
is only going to be present when there
is power going through the machine which
is a condition under which I cannot
measure resistance to ground on any
power line because you cannot measure
resistance with a multimeter when this
power going to the board
hopefully this has taught you something
hopefully you've learned from my idiocy
and as always I hope you learn something
thank you very much and I will see you
in the next video see in the next one