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820-00164 (Fast fan, No SSD detected)

ALB-Repairs

ALB-Repairs

Member
Was liquid. Was cleaned, repaired backlight.

I now have fast fans and it doesn't recognise any ssd (tested with known good ones)
I really dont know where to look. SSD gets power.ect, entire circuit looks fine, no components ripped off/corroded.

Also oddly enough i cant get it to boot selection or diagnostics. Im starting to suspect the SMC, reflowing it however has made no difference.
Checked the entire board for clues under a microscope and couldnt see anything abnormal.

I really dont know where to start.
 
D

dukefawks

Administrator
Can you boot internal diagnostics from USB? If it doesn't get to the question mark how do you know it is not recognizing the SSD?
 
ALB-Repairs

ALB-Repairs

Member
Hi.
I cannot get to boot selection via the alt key, and the D key does not respond when it powers on. I have not yet tried with a USB keyboard as the internal components are known good parts.

It gets to question mark, i have managed to boot it to an installer but it was running slow.
So obviously there is a sensor error (probably temperature).

I will have a bit more of a fiddle when im next in the workshop
 
peterfixit

peterfixit

New member
yep and it will say, oops theres a problem, take me to an apple store. take it to an apple store, we cant fix it need to replace logic board
 
ALB-Repairs

ALB-Repairs

Member
got it to run diagnosis. It seems in EFI the trackpads not working (sometimes i can get a bit of vertical movement), But im sure it worked in a 10.12 installer
Said there was also an issue with SSD storage but thats to be expected.

Ive started inspecting the tpad_SPI lines.ect but i can confirm this is a good trackpad and is 100% a board fault.
 
S

SMMRepair

Member
Might be a dumb question, but have you made sure you're testing the board in a 2013-2015 casing and not a 2012 casing? The trackpads and KB/TP cables are not compatible across 2012 and 2013-15. This wouldn't affect the SSD issue, however, but it could explain some of the other issues.
 
ALB-Repairs

ALB-Repairs

Member
Yes im sure its in a good casing... the correct year.ect

I reflashed the EFI on the motherboard, it kept failing to erase the chip at a certain address. So i ended up fitting a different chip and reprogramming it (with a clean ME Region)

It didnt make a bit of difference though.
This board is driving me mad.
 
D

dukefawks

Administrator
Need to know some stuff for sure.
Does the trackpad/keyboard work in the boot menu?
Does the trackpad/keyboard work when booted from USB into OSX?
 
ALB-Repairs

ALB-Repairs

Member
Right
Keyboard only occasionally works in boot menu
Trackpad Jumpy as hell in boot menu

Keyboard and trackpad work in OSX perfectly.

Since installing an SSD and re-running diagnosis it just gives the generic 'there may be a problem with your SMC'
 
D

dukefawks

Administrator
Only thing I can say is checking all pins of trackpad connector for continuity to the trackpad, check all voltages and also on diode mode.
 
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