820-3787-A does not turn on

Ares332

Member
Hello friends, I have a macbook pro 820-3787-A that does not turn on.
PPDCIN_G3H_INRUSH = 0v
PPBUS_G3H = 0v
CHGR_SGATE = 0v

The voltage goes up to q7180 ppdcin_g3h = 20v and chgr_agate_div = 19.20v
I have changed the isl625 charging circuit 3 times thinking that the one they sent me was bad.

I have 6 months with that damaged macbook, it is mine, when I started to repair it, the macbook turned on when I pressed the charging ic.

Sorry for so much trouble, I hope you can help me fix it
 

2informaticos

Administrator
Staff member
Do you get 3V42_G3H voltage?
Check diode mode to ground at L7095 and F7140.

Post U7100 basic voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Use surrounding components as test points; do not check directly on chip pins (when possible).

Exact resistance (ohm scale) between pins 17/18 and 27/28?
 

Ares332

Member
3V42_G3H YES = 3.4V

DIODE MODE
L7095 = 0.32v in 1 y 2 pin
F7140 = 0.440 in 1 y 2 pin

U7100
voltages
1 = 18.90v
2 = 20.22v
3 = 0v
9 = 0.061v
12 = 3.4v
13 = 3.3v
14 = 0v
15 = 0v
17 = 0v
19 = 5.4v
20 = 5.4v
27 = 0.403v


U7100
diode mode
1 = 0.653v
2 = 0.590v
3 = 0.547v
9 = 0.721v
12 = 0.322v
13 = 0.520v
14 = 0.545v
15 = 0.727v
17 = 0.435v
18 = 0.440v
19 = .325v
20 = 0.320v
27 = 0.652v
28 = 0.631v
 

Ares332

Member
U7100
voltages
1 = 18.90v
2 = 20.22v
3 = 0v
9 = 0.061v
12 = 3.4v
13 = 3.3v
14 = 0v
15 = 0v
17 = 0v
19 = 5.4v
20 = 5.4v
27 = 0.403v

AL ENCENDER LA FUENTE SE QUEDA EN .008a
 

Ares332

Member
PPBUS_G3H = 0.8v -- diodo 0.424 -- resistencia 1.007k

Isla6259 pin 24 = 0v -- diode 0..422v -- resistencia 1.130K
 

Ares332

Member
U7100
Estos son los voltages, disculpa la demora
1 = 0v
2 = 20.15v
3 = 4.6v
9 = 4.3v
12 = 3.4v
13 = 3.3v
14 = 3.2v
15 = 0v
17 = 1.6v a 1.8v
18 = 1.6v
19 = 5.4v
20 = 5.4v
27 = 19.74
28 = 20.36v
 

2informaticos

Administrator
Staff member
Como puedes conseguir 10 + 10 + 0.020 = 7100000 ???
Eso, ni Houdini...

Has pensado en alguna pista rota/corroida, entre dichos resistores?
 

Ares332

Member
Aveces suelo hacer magia, pero nunca tanta 🤣🤣, listo ya quedó la MacBook, ya enciende, solo me falta probar si funciona el SSD ya que recuerdo no lo detecta a, pero mañana te confirmo para ver si me puedes ayudar, dejo una foto de el problema, solo le bajó la calidad a las fotos porque no me deja subirlas, muchas gracias amigo por la ayuda
 
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