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820-000165 wont turn on

2informaticos

2informaticos

Administrator
Staff member
Looks like leakage issue.
Charger detects it and get blocked and tries again and again.
3V42 also pulsing?

Try with fake charger, or bench power supply, using 60/85W power cable.

"Also still only 17.5V on pad 2 of R7185 and C7185 but both have 18.5v on pad 1."
Mmmh, then no leakage, if stable PPDCIN_G3H.
Remove C7111 and check again ACIN level.
 
K

Kyle93

Active member
3v42 is fine at a steady 3.4V

I have been using bench power supply with 85 watt cable the whole time

With C7111 removed there is still a leakage issue on ACIN. voltage ranges from 0.100V to 2.5V to 3.4V
 
2informaticos

2informaticos

Administrator
Staff member
Change R7110/11; maybe U7100 too.

You can also try the trick to force 3v42 to pin 3.
In such case remove R7110; even R/C7111.
 
K

Kyle93

Active member
Only 2.6V with r7110 r7111 and C7111 removed

U7100 has been changed 4 times now, not sure if it needs to be changed again
 
2informaticos

2informaticos

Administrator
Staff member
"Only 2.6V with r7110 r7111 and C7111 removed"
You should bring 3V42 there...

Be aware, without R7110/11 charge may not power up the board.
Is better to let R7110/11 soldered and cut off trace to pin 3/ISL6259.
Then bring 3V42 to ACIN pin.
 
K

Kyle93

Active member
steady 3.4V on pin 3 ACIN pin now but 0V on pin 1

C7185 and R7185 pad 1 18.5V but only 7.52V on pad 2
 
2informaticos

2informaticos

Administrator
Staff member
Resistance to ground at L7130?
Post other voltages for U7100; pins 2, 12, 13, 14, 9, 15, 17, 19, 20, 26, 27.
Check resistance between pins 17/18 and 27/28.
Do you get amber light on Magsafe?
 
K

Kyle93

Active member
0.7 L7130

U7100 pin 2 18.25V pin 12 3,4V pin 13 3.2V pin 14 1.3V pin 9 0.36V pin 15 0V pin 17 1.75V pin 19 5.10V pin 20 5.10V pin 26 0V pin 27 0V

resistance 17/18 23 27/28 20.8

yes amber light on charger
 
2informaticos

2informaticos

Administrator
Staff member
"pin 14 1.3V
-----------------
pin 9 0.36V
--------------
pin 17 1.75V
------------
pin 27 0V
--------------
resistance 17/18 23"
All bad values.

Change Q7180 and come back with news.
Also check R7121/22 and R7180/81/85/86.
 
K

Kyle93

Active member
changed Q7180 and checked R7121/22 and R7180/81/85/86. All values are good.

pin 14 3.4V

pin 9 3.4V

pin 17 1.636V

pin 27 0v
 
2informaticos

2informaticos

Administrator
Staff member
"pin 9 3.4V"
This is the result of
"resistance 17/18 1.320"
So check R7150/51/52 and their traces to U7100...
 
K

Kyle93

Active member
when checking R7150 noticed have 0.003 short to ground. When Q7130 is removed short is gone but once Q7130 is replaced and soldered back on short returns.
 
2informaticos

2informaticos

Administrator
Staff member
Did you change Q7130 with good one?
After change it, check diode mode on F7140 before powering the board.
As above mentioned, be sure R/C7125 traces.
Do NOT power untill check all traces OK.
 
Last edited:
K

Kyle93

Active member
As far as I know Q7130 should be good. Pulled it from donar board,

0.141 diode mode now on F7140. All traces look good, no liquid damage on this board. History is store claimed board was working fine and that it just suddenly died.

Waiting for response if I should check anything else before I power board again
 
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