820-001598 SSD Upgrade

[mushr00m]

By the way I reballed and resoldered each of the 4 NAND IC which was going to be the upgrade to 512GB still no behavior at all.

THEN

I reballed and resolder back only the 2 ORIGINAL IC (128gb) and still no behavior at all

I remove the original nand without breaking any pad, I guess I did it right, I only knock the cap CD545 and put back it in place.

Wihout CD545 would the machine turn on?? i think gnd pad broke and maybe CD545 is not properlly connected to the board

Beyond that I think everything was done as usual

 

[2informaticos]

Do you really think that using bold letters and quoting last post helps???

To boot, a machine MUST complete first the power on sequence (POS).
Machine turned on doesn't mean is booted always; just stays on.
PLT_RESET_L goes high when POS is done.

To complete POS, T2 requires to run its dedicated software LOCATED INTO HIDDEN SSD PARTITION.
Be aware, SMC functions are now embedded into T2.
How could this be possible, if no NANDs soldered on the board???

If still not clear, you are free to ask more. I still recommend you to check POS; available for 820-01055 and 820-01598 boards.

 

[2informaticos]

CD545 is not critical.
Just be sure the trace for PPVCC0_ANI_SSD0 is not broken.

If machine doesn't work with original NANDs, this confirms that something else happended on the MLB.
Did you try again DFU mode?

 

[mushr00m]

I soldered the two original NANDS
removed CD454 which has GND pad broken on the board itself

Still no behavior at all

Yes I tried DFU using another macbook and the cable connected and doing that keyboard thing to enter DFU. It does not enter DFU.

What can I do from now?

I dont think I heat too much the board.
The only thing I knocked as mentioned was that cap which is not critical
Can't think about another thing

Should I check PLT_RESET_L ??

How could I break this trace PPVCC0_ANI_SSD0? Should I look on the components itself on the board?

 

[2informaticos]

No idea if that rail is broken.
I mentioned it just because you've said to found a damaged cap on that line.

If you don't find any damaged component, or trace, what else apart of heat can cause the problem?

Your board doesn't boot, no CPU voltages.
There is no reason to search PLT_RESET_L.

 

[mushr00m]

I did not damage the cap
i knocked it when lifting the NAND itself
The gnd pad of this cap on the board was broken


Do you think the HEAT could be the problem? but this area only have the NAND and small caps with black glue around

 

[2informaticos]

Possibly internal board damage.
There are very tiny traces going to T2.

 

[mushr00m]

I cannot believe enough heat to solder a nand would destroy traces underneath the board.

In this case would be almost impossible to solder and desolder NANDS IC's

I really need to save this board! Please advise me as much as you can

PLEASE!!

 

[2informaticos]

If nothing else of NAND chips is damaged on the board, machine MUST enter DFU at least.
Try to understand, something else got damaged on the board.

In case like this, bad solders, broken trace/pads, knocked off components are classic things to check.
Hoping no other components have been affected.

T2 gets all voltages required to enter DFU?

 

[mushr00m]

If nothing else of NAND chips is damaged on the board, machine MUST enter DFU at least.
Try to understand, something else got damaged on the board.
Like what could be damaged? the only knocked off components is already removed and also non critical as you mentioned

In case like this, bad solders, broken trace/pads, knocked off components are classic things to check.
Hoping no other components have been affected.

T2 gets all voltages required to enter DFU?

I sent you all the voltages you already asked and you also told it should go to DFU

 

[2informaticos]

"you also told it should go to DFU"
I didn't say that exactly!
"If nothing else of NAND chips is damaged on the board, machine MUST enter DFU at least."

 

[mushr00m]

Where you go first to try to solve this machine? I need to solve it ASAP

Please help me check what is possible to bring it to life!

 

[2informaticos]

I repeat, machine was working; something happended in the NANDs change process.
If all components are in place and good solders, I can only suspect board internal damage.
Or some other chip damaged by heat.

As it doesn't go into DFU, T2 is also suspect now.
Did you try correctly to enter DFU?

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

logi.wiki

 

[mushr00m]

Before going 100% of board internal damage what would you do to give it one more try?

 

[mushr00m]

DFU was done with a hots m1 pro mac connected with the cable both on the left upper port using the correct keyboard sequence on the target Mac

 

[2informaticos]

Did you successfully complete DFU now?
In such case, SSD is in working condition.

 

[mushr00m]

Yeahhh

Actually

I resoldered all the 4 IC chips which I bought to go to 512GB. (I think I did a good job and soldered all of them OK)


using a wire on SE032 I turn it into DFU automatically however I couldn't restore/revive/update it =/ error message attached.

What would to from now?

 

[mushr00m]

I think its a positive message to get it into DFU using FORCE DFU wire

Help me make this machine work again

 

[2informaticos]

It should automatically appear in Recovery mode, once NANDs have been changed.
Don't force it in DFU.

You can't be sure about SSD yet.

 

[mushr00m]

The supplier from Aliexpress told me after replaceing NAND I should do the DFU restore.

Did he mention it wrongly?