Macbook A1534 820-00045

[Nitin Sachdev]

Hello guys

have one query related MacBook A1534 820-00045 gets stuck on the Apple logo as soon as it starts up. In this condition, if I press the power key for 4-5 times continuous ,the MacBook starts up and then works fine. Macbook was working earlier but after resetting it came in this condition.tried resetting several times.

any suggestion

 

[2informaticos]

First of all, welcome to the forum!

What kind of reset do you mean, SMC reset, PRAM?

You should discard a software issue first.
Save data and install new macOS.

 

[Nitin Sachdev]

this problem happens while installing the new macOS....

i already tried to re install the macOS but problem is same....

SMC_ONOFF_L 3.295V is present
F/L4800 7.65 is present

 

[2informaticos]

By resetting, do you mean new installation tried?
Try known good BIOS...

 

[Nitin Sachdev]

Yes new installation of macOS

Before installing fresh MacOS, macbook was working good but after installation
macbook gets stuck on the Apple logo as soon as it starts up. In this condition, if I press the power key for 4-5 times continuous ,the MacBook starts up and then works fine.

 

[2informaticos]

Then the BIOS is first suspect...

 

[Nitin Sachdev]

Is there is any different process to read & write bios data for this macbook or
I have same model donor board, can I directly transfer the bios chip to faulty macbook

 

[2informaticos]

You can transfer the chip for test.
But it has dirty ME region for the other board.
And this may cause strange issues; not a good option for this case.

Being BGA chip, I recommend you to write clean ME BIOS directly; avoid repeatedly solder/unsolder process.
You will need correct adapter for that chip.