820-3787-A macbook pro 15 retina mid 2014 discrete gpu

andrespi

Member
This macbook shuts down or freezes when the battery is connected.when working with only charger it works correctly.I have tested with a good battery, the problem persists.In ASD error battery
 

andrespi

Member
I already tried with a new battery and it has the same problem, I tried the "bad" battery in another equipment and it works fine
 
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andrespi

Member
What temperature and air to use components near cpu, and how long in previous days damaged a cpu when removing a component. Any recommendations?
 

2informaticos

Administrator
Staff member
Each hot-air station has its particular settings.
You should practice in scrap boards.
ALWAYS remove CPU heatsink.
 

andrespi

Member
the best way to remove corrosion is with flux? a suitable temperature must be set to clean with flux and little air?
 

2informaticos

Administrator
Staff member
Use heat and quality flux to burn accumulated crap under BGA chips.
For visible corrosion, scrub with toothbrush and alcohol.
Pay atention, do not knock off components and rebuild any affected trace.
 

2informaticos

Administrator
Staff member
Flux doesn't clean, it should be cleaned after all; with IPA, or ultrasonic bath.
I said the flux serves to burn the crap caused by liquid spill.
180 degrees is good enough.
I talk about board temp; hot air station will be set to 350-450; depending of air flow and distance to board.
 

andrespi

Member
thanks, If I leave a high temperature in my quick 480 degrees for a long time to remove some component, it is possible to blow the board, open track?
 

2informaticos

Administrator
Staff member
You cannot buy NEW FDMF6808N; never sold, only fake chinese.
Buy new FDM6708, or FDMF3030 from reliable seller; like farnell, or mouser.
 
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