(347) 552-2258 [email protected]

Macbook A1502 (820-3476)

Instafixx

Instafixx

Member
Machine doesn't turn on.
PPBUS is 12.6V
PP3v42 present.
Fan Spin is there. Takes 500 mAmps.
Just go into Diagnostics or Recovery Mode. Board is clean.
 
2informaticos

2informaticos

Administrator
Staff member
"Machine doesn't turn on
...........................
Just go into Diagnostics or Recovery Mode"
Not sure how to interpret that.

Do you get CPU core voltage?
 
2informaticos

2informaticos

Administrator
Staff member
If you said doesn't turn on...

However, it turns on, if fan spins.
What about CPU core voltage?
Check U1950 voltages.
 
2informaticos

2informaticos

Administrator
Staff member
"Fan Spin is there
.......................
Pulses in accordance with Fan Spin"
Didn't mention any pulse on fan before.
Do you think is good (for you) to waste time, not posting accurate information?

So, power cycling every 5s, or how exactly?
Maybe just 2 pulses...

Did you try SMC bypass mode?
 
Instafixx

Instafixx

Member
SMC Bypass didn't work.

Pusling :
First Fan Spin 10 Seconds.
Then Stops for 2 Seconds.
Then it spins continuously for 20 seconds till it starts speeds up and eventually shuts down.
 
Instafixx

Instafixx

Member
L7310/20 is 1.8V
PLT_RESET_L is 3.4V

Tried Re-Balling SMC. Didn't Work

Connected the charger and did a thermal scan.
U3900 gets mildly heated up - around 40 Degrees Celcius.
 
Last edited:
You must log in or register to reply here.
Top