If I connect it here
the phone says it is charging
and here's consuming, the problem is when the phone turns off
look what happens, the phone
the phone stops consuming
reached 0.02 and then 0, this phone is no longer charging
if we move here
the phone is on, if we press this
the screen turns on
and here starts consuming
so the phone
it's not charging when it's off
it only charges if it's on, look I'm going to block it again
now it's blocked and one more time this
goes to 0, let's connect it to the computer
and open 3uTools, now it's detecting the phone, and we have to see this
where it says "Battery"
"Battery life No Data"
What does this mean?
The phone is not recognizing the battery
change the Tristar the times you want, the phone will never charge
let's go to the schematic and look for Tigris
it's detecting the cable, so the Tristar is working
because Tristar is in charge of detecting the cable, but Tigris is also in charge of charging the phone
so, if we move here, we'll look for two important lines
both G1 and F2, these are the battery detector lines
ok, so we have the F2
it says it goes to TIGRIS_TO_BATTERY_SWI
that's a verification line
and the other goes
from verification to bidirectional processor
carries and receives
brings and brings data, what are we going to check first?
First we're checking the F2
we can see that this goes to a series resistor
this resistor is 100 KΩ
and has a tolerance of 5%
if this resistor doesn't have the corresponding value, it will never detect the battery
then on the other end of the resistor, it goes to
the center pin from the battery
Well, we have to check two things
communication of the center pin of the battery and the resistor
How do we check the communication? Easily, with diode mode
we have to be very careful with this
this you can see here
it's a very typical thing that we always forget to do, but we must do it, I always do it
What do I do? I pull these pins out a little bit so they can make contact
ok, let's check in diode mode with our multimeter
and put positive tip to ground, touch here and we can see
a value of 596, I'm touching the middle pin
this resistor should have a value of 100, this one
There it is, 100
was accurate
the resistor is perfect
what do I need to do next?
before removing the circuit, remember that I have just attached the battery pin
let's get out of doubts and let's see if
it was just that, we avoid removing
the Tigris and all
now it turned on, let's connect the cable with the PC
look, "Battery life 90%"
now let's do the next test, let's see if the phone charges
when it is off, let's block it
now it's blocked and...
let's see if it goes down
there it is, the phone is still charging, has not gone down at all
look, 39, 30, that's normal
27, 38
if it went down to 0 we should be concerned, but since this is not the case
apparently the Tristar had already been replaced
it was just that pin, that line from here
it's important that it touch the battery pin, otherwise it will
not recognize the battery and there will be a false charge