820-00165-02 - Seems to be NO BRAIN

mushr00m

Member
Didnt tried that since I am not 100% sure which area is the PCH one. The older models like A1278 have a big PCH... this one is integrated with the CPU right? So I should HEAT the CPU? Or am I wrong?

Since I ONLY have a QUICK 861DW HOT AIR STATION..

How to properly approach it?
 

2informaticos

Administrator
Staff member
Didn't see two Si dies on the CPU?
Guess which is which?
If you follow PCH lines in schematic, where they go?
Boardview should help better.

We discussed so many times about heating BGAs on the forum.
I gave you some temp/time values; you should use 20-30% of air flow.
As I said, the temp refers to chip, not to hot air station.
To achive 200 degrees on the board, the station must be set at 350-400 degress; depends the model and every unit has also its tollerance.
Distance hot air nozzle to board also must be considered.
You should practice with scrap boards.
Is all about practice, we all do it at "the eyes" (only one in my case).

The goal is to burn eventually accumulated crap underneath, not to melt the balls.
Once the (good quality) flux starts to boil, shouldn't increase the temp too much; don't exceed the time.

BTW, the role of the forum is to assist on the repair process.
For personal training, contact Rossmann staff...
 
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