Hey guys
Finally I have some time on my night shift at work.
I'll start with the ground things.
Starting whit OLED/Light Switch
On this units the emmc is soldered to the main PCB.
I do not recommend anyone to start with this as it is very heavy and in my experience requires a preheat plate. The circuit board absorbs so much heat that the emmc is grilled in time.
Next problem is you need the modded spacecraft-nx firmware on your modchip.
This firmware write the ninti bct to your emmc (boot0).
Otherwise you must write the boot0 from a mariko unit to your emmc whit an external tool like
this,
this or
this.
With the latter two it is necessary to solder the emmc onto the small emmc circuit board. which then makes a reballing necessary.
Normal Switch whit the emmc daughter bord.
changing the emmc on the small circuit board is much easier.
the small circuit board absorbs much less heat so that the emmc starts to "swim" after 10 seconds at the latest.
I would also strongly advise buying a separate emmc board. Should something go wrong, you still have your original emmc board here.
To the emmc chips from Ali/Taobao.
First don't buy SanDisk emmc's!
This emmc chips have only 4mb cache inside, it's very less and you have
Performance breaks.
Samsung chips are fine and should be preferred to all others.
They have 64mb cache, much more then SanDisk.
Second, all emmc's i bought (12 pieces) came ready for soldering (reballed)
Needed tools for soldering and reballing.
Soldering:
- a magnifying glass
- a pair of tweezers (Ifixit's ones are good)
- a good flux, amtech are recommended
- a small brush to apply the flux
- desoldering braid, mg chemicals super wick is good but all others should also work
- a soldering iron with a chisel tip
- a hot air station, don't buy the cheapest you can find
- a preheating plate if you want to mod an OLED or light switch
- a third hand to hold the emmc board
- isopropanol alcohol (ipa) to clean the PCB
- kitchen towel
Reballing:
in addition to the things mentioned above
- bga 153 stencil
click ,
this one is perfect for later switch rework jobs
- a good leaded solder paste, i use the mechanics one
click
- a tool to apply the solder paste to the stencil, best is a Scalpel with an elongated blade
or the flat side from a spudger
- a fork! ? yes we need a fork to hold the stencil in position, it's better as a tweezers
Starting whit the emmc daughter board
to be continued...