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820-01700 U5450

C

CRC2018

Member
So today I received in an 820-01700 from a Macbook 16". Is liquid damaged but only in a small area of the board around U8400. I've found U5450 is completely burned to the point that even the traces on the board aren't there and will need to be repaired. That being said does anyone know where I can get a replacement for U5450? I've searched INA214A and am only finding the SC-70 version!

Alternatively is there another replacement part I can use for U5450?
 
C

CRC2018

Member
I'll have to have a look through them - I think I only have one post 2016 scrap board which was from a non touchbar 13 inch. I'm guessing the non type c boards are a no go? I've got a fair few 820-00165, 820-3437 and 820-4924 boards. This is the first 16 inch one i'm seeing - you gotta love those customers who spill liquid on there machines turn them upside down and use them for a couple days then bring them in complaining they don't turn on anymore!
 
C

CRC2018

Member
As a further update to this I couldn't find any on the boards I had. I've tried NCS214 which does work just the same and I also had to replace U5410 which I replaced with NCS210.
So for future reference you can replace INA214A with NCS214 and INA210A with NCS210 providing you buy the correct UQFN package type.

After fixing these issues the board powers up but the power button wasn't working - checked the voltage - 1.8v there which drops to 0v when depressed. Checked PMU_ON_OFF_L which was at 3.3v and didnt drop when the power button was pressed, shorting PMU_ON_OFF_L to ground made the machine power up so on the basis this particular machine is urgently wanted back by customer i've removed U4901 and R4971 and jumpered PMU_ON_OFF_L directly to PMU_ONOFF_R_L and now i've got a fully working power button. Not really understanding why Apple bothered putting U4901 there as from what I understand on the schematic this particular IC takes 3 inputs and sends the output to 1 output yet Apple have tied the other two inputs straight to ground on the board. Perhaps someone in the know can explain this one to me and if my approach is likely to cause any issues?
 
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