Just in case, check diode mode in all coils and compare with good board.
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A1990 (820-01041-07) - PPBUS_G3H = 12.23V
- Thread starter HeyWatchOutDude
- Start date
HeyWatchOutDude
Member
I don’t have a good board :/ Regarding to the “wiki” it says that “Error 4014” means bad T2 RAM or battery.
In case the RAM is bad, can it be replaced by a good one? So is the RAM serialized with T2 CPU? (CPU and RAM are “sandwiched” right?)
logi.wiki
In case the RAM is bad, can it be replaced by a good one? So is the RAM serialized with T2 CPU? (CPU and RAM are “sandwiched” right?)
DFU Mode Restore (Macs) - LogiWiki
We have Apple MacBook and iPhone Diode readings and general fault finding information compiled by the leaders in this area
Dealing with such sandwich chip is a nightmare.
Just watch this:
I didn't hear anybody changed only upper layer; there is T2 RAM located.
Some kind of "mariage" has been done by Apple, for sure.
Just watch this:
Some kind of "mariage" has been done by Apple, for sure.
HeyWatchOutDude
Member
I have already removed a good known "T2-chip" (from another donor board) but now I have some struggles with reballing it. (Note: I have a stencil and I use soldering paste)
Issue: When I press to hard on the stencil it moves etc. and also the heat kinda "deforms" it.
(Stencil: https://de.aliexpress.com/item/1005...!sea!DE!2089647285&curPageLogUid=DGeBOcZ3wRIF)
Do you have any tips for me? How to get the job probably done?
Issue: When I press to hard on the stencil it moves etc. and also the heat kinda "deforms" it.
(Stencil: https://de.aliexpress.com/item/1005...!sea!DE!2089647285&curPageLogUid=DGeBOcZ3wRIF)
Do you have any tips for me? How to get the job probably done?