A1398 - Charger Green/Orange - No Boot - No 12.5v

Hello,

The machine is a 2014 A1398 2.8GHz 16GB DG.

There was liquid damage however the customer decided to wipe away the evidence before brining the laptop in.

I am getting 0.7v on PPBUS_G3H

I am assuming that a short is causing this but can't see or feel anything hot.

Thanks!
 

2informaticos

Administrator
Staff member
I hope you didn't inject voltage on PPBUS_G3H yet.
Post the exact diode mode (red probe at ground) on PPBBUS_G3H.

Do you get 3V42_G3H?
Post 820-xxxx code of your board.
 

2informaticos

Administrator
Staff member
Post ISL6259 voltages; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 20, 27.
Also post exact resistance between pins 17/18 and 27/28 (ohm scale).

BTW, your mainboard isn't 820-3787???
 
After connecting the machine to power again the CPU/Heatsink is getting pretty hot.

I measured the Pins again and have outlined the changes.

ISL6259 Voltages

Pin
1 - 0v
2 - 20.1v
3 - 4.66v
9 - 0.23v
12 - 3.39v
13 - 3.08v
14 - 2.29v
15 - 0.04v
17 - 2.46v
19 - 5.49v
20 - 5.49v
27 - 19.9v

Shall I go ahead and provide the measurements you requested or does this change things?

Thanks
 

2informaticos

Administrator
Staff member
Some things changed now.
All mentioned resistors should be good.

Post diode mode to ground at PPBUS_G3H; connect red probe to ground!
 
Ok so things changed again, when I reconnected the genuine MagSafe 2 85w adapter there was no indicator light.

X3 chargers tested which work fine on other machines.

I am going to re-measure everything and provide again.
 
Yep always original, no fakes here.

Have been looking at the onewire/adapter sense systems to work out what's preventing the charger light from coming on.

More than I bargained for...

I have a bunch of working boards to compare against.

U7000, U7001and surrounding components seem good.

I am getting 1.7v on the PP20V_DCIN_FUSE but only 0.11v on SMC_BC_ACOK

SMC?....
 

2informaticos

Administrator
Staff member
" 2 - 20.1v
-------------------
I am getting 1.7v on the PP20V_DCIN_FUSE"
So, what happened???

Looks like charger detects leakage on the input stage.
Usually Q7180, or D7010 problem.
 
I don't know what caused the extra challenge. It must have been me and a loose grounding wire to the multimeter, no one else to blame etc.

I have components to swap out.. but first

Getting the following in diode mode..

DCIN_ISOL_GATE_R to GND - 954
DCIN_ISOL to GND - 1012

On a good board I get

DCIN_ISOL_GATE_R to GND - No reading
DCIN_ISOL to GND - 1012

C7012 or am I barking up the wrong tree?
 
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