A1286 has green light on mag but won't charge or turn on

[Biggtechman]

Got a macbook a 1286 come in the other day.
it has a green light on mag but won't charge or turn on.

anyone got any advice as a good place to start ?

 

[Alan.L]

logic board number?
have you try unplug the battery, keyboard flex cable and other cables then plug the charger to see if get light?
genuine apple 85w charger?
any history?
can you list all the power rails?

 

[Biggtechman]

It gets no light when nothing is plugged in.
I get the 3.4v at resistors near the battery meter plug

 

[2informaticos]

"logic board number?"
Do you really need help???

"genuine apple 85w charger?
any history?"
Reply to the questions, our help is based on your posts...

"can you list all the power rails?"
ISL6259 on the basic pins should be good enough to start: 2, 4, 19, 20, 12, 13, 9, 15, 1, 26, 17/18, 27/28..

 

[Biggtechman]

MLB w80180487fyra
the charger I got with the mac is a not genuine it reads 16.5v 3.65a
however I have a genuine 85w charger and it still stays green, when I press battery indicator it lights up 1 bar, with or without the charger.

history.
they said it stopped loading and went to a grey screen. They said it stopped turning on. They brought a new battery. Still wouldn't turn on.
it had been sitting for a year or so. Then brought to me.
I have to download the board for board view and schematics.
will let you know reading soon

 

[Biggtechman]

Damn I'm a macbook noob.
820-2353
sorry
getting reading

 

[Biggtechman]

I can not find a board view file for 820-2353 any at all..
could you kindly point me in the right direction

 

[Biggtechman]

I can not find a board view file for 820-2353 any at all..
could you kindly point me in the right direction

 

[Biggtechman]

Ok
its official
I'm an idiot...
the mb no is
820--2850-a
sorry

 

[Biggtechman]

Ol
pp3v42_g3h is there.
pp1v05_s0 is not there and shorted
pp5v_s0 is not there and shorted.
Any advice ?

 

[2informaticos]

"ISL6259 on the basic pins should be good enough to start: 2, 4, 19, 20, 12, 13, 9, 15, 1, 26, 17/18, 27/28.."

S0 voltages are the last in the power sequence; give them time...

Post SMC_RESET_L and U6900 voltages (1, 4, 5).

 

[Biggtechman]

Smc_reset_l is 3.415v

U7000
2, 16.14v flaculating to 16.44v
4, 3.411v
20, 5.04v
12, 3.414v
13, 3.414v
9, 030.8mv
15. 050.3mv
1, 14.95v
26, 16.06v
17, 254.2mv counting down.
18, 212.3mv counting down
27, 000.7mv
28, 000.7mv

 

[2informaticos]

Resistance to ground at L7030?
Post R7080/81 and R7085/86 resistance values; on boatd, no need to remove, 2M scale.

 

[Biggtechman]

L7030 reads around 345.4 but it is constantly slowing moving. Down or up.
R7085/6, 09.20
R7080, pin 2 08.62, pin 1 08.42


what is m2 scale ?

also measuring resistance. Red on earth black on component.
I read someone that it should give some reading not matter what I do it.

 

[2informaticos]

I didn't ask for voltages!!!
Measure mentioned resistors in 2M(egaohms) scale...

 

[Biggtechman]

L7030 in m ohms. 0.872 but seems to keep dropping.
I'm wandering jf mu multimeter is reading wrong, possibly broken in resistance mode.
The reading changes if I change polarity. And reading counts up or down and seems to not stop.

 

[2informaticos]

Measuring R7080/81 and R7085/86 in 2M scale, will give us an idea about leakage on Q7080.
Just to measure 4 resistors, I can cannot explain more simple, sorry...

L7030, as other power rails, is sufficient to test on diode mode.