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Modello A1502 / processore dual core Intel i7 2,6 GHz (Turbo Boost fino a 3,1 GHz) o 2,8 GHz (Turbo Boost fino a 3,3 GHz) con 4 MB di cache L3 condivisa.

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MacBook Pro freezes during login

Hello,

My MacBook Pro freezes completely during or right after the login screen.

First I was thinking that only my Keyboard and Trackpad wasn’t working, but when I was looking for the time after a while and I saw that it was incorrect so the screen is also completely frozen.

If I’m fast enough sometimes I can run a task after login in, but it freezes directly about 10-20 seconds after start up.

In Safe Mode everything works perfect and smooth like you would normally expect.

Only the graphics are slower and no sound allowed what is normal in Safe Mode, But no issues or flashing screen.

Apple Diagnostics are also perfect, zero hardware issues shown.

The strange part is when I plug an HDMI cable in before starting the Mac with HDMI connected bypasses the freezing issue!

The Retina display and External TV works together without problems, everything is responsive keyboard trackpad screen , just like normally.

But the second that you remove the HDMI cable from the Mac it freezes directly and you need to force shut down the Mac.

Already formatted the whole SSD inside, installed High Sierra, Mojave Clean install, but nothing changes. Even tried to start Sierra on External SSD with USB and works until the Login and freezes like the internal SSD.

Maybe malware, virus?

Please Help and thanks in advance !

Aldo B.

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Lets see if we can do some diagnostics here. Restart your system hold the D key as well to enter in to the on-board diagnostics. Did any error message pop up?

To be honest, you do sound like you have an OS install issue and/or the drive is failing. If diagnostics comes out clean I would focus on the drive here,

da

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OK, I’ve seen this before! The way this system sends the video output is a bit convoluted if you look at the schematics. The signal is muxed between the DisplayPort (DP) output and the HDMI output. The DP signal is then muxed still again between the internal display and the Thunderbolt port to service a DP or Thunderbolt connected display. The chip U9750 is where this takes place. I would check around it for corrosion, or a damaged or missing resistor or cap as they are needed sink the signal so the switch is clean between the two external loads. The chip in on the back side of the logic board, here is a BoardView of the spot

Block Image

The cheap solution is to just use a HDMI plug to offer up the load. Or you can see if the logic board is repairable.

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@danj is this the "HDMI plug" you are referring to? https://www.amazon.com/Monoprice-HDMI-Co...

da

@ajcooke01

I just took the original SSD out of the mac,

and made the test at empty SSD slot with External Usb SSD attached and no luck.

Just had the time to put my password in to log in , 2 seconds later it started freezing again.

im not sure if i would replace the logic board cause it costs already about 400€,

and for an ‘old’ Dual core is already an high cost i think.

At the worst case i just will use this mac as ‘Desktop’ with Hdmi i think.

But it’s really sad cause this is definitely Apple fault, But now that the problem showed after my 2 years warranty there is nothing to do.

@danj

Thanks for the update,

When i opened the Macbook it looked like new, no dust or nothing.

It never did fall, so the chip u tell me is on the backside? it's needed to unscrew the logic board to be able to see the chip ?

thanks!

da

@ajcooke01 - No, thats an adapter you just need the HDMI plug part (take an old cord and cut off the connector)

Aldo - Sadly, it's the side you don't see and the one that often gets wet when something is spilled into the keyboard ;-{ So Yes, you'll need to pop off the logic board to inspect it.

da

I just tried it 3-4 times now with a regular Hdmi cable but this time only connected to the Macbook and other part hanging on the floor.

( Normally doing exact the same thing as an adapter plug )

The first try was like 2 minutes without freezing, but then the other tries freezing after 10-20 seconds. Maybe this is an effect of the SSD that have been ejected en inserted again.

da

i'm now testing it with an Mini Displayport to DVI thru the thunderbolt port and works again perfectly when it's really connected and reveals the monitor.

So in order to work correct it have to detect the external monitor.

da

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Seems like you have tried nearly everything. It appears to be either a Logic Board problem or a Hard Drive or SSD problem. Let’s try a new SSD first and them move onto replacing the Logic Board.

[prodotto collegato mancante o disabilitato: IF123-123-1]

Sostituzione SSD MacBook Pro 13" Retina Display metà 2014

https://www.powerbookmedic.com/MacBook-P...

MacBook Pro 13" Retina Display Mid 2014 Logic Board Replacement

Immagine MacBook Pro 13" Retina Display Mid 2014 Logic Board

Guida

MacBook Pro 13" Retina Display Mid 2014 Logic Board Replacement

Difficoltà:

Moderato

40 minutes - 1 hour

Immagine MacBook Pro 13" Retina Display Mid 2014 SSD

Guida

Sostituzione SSD MacBook Pro 13" Retina Display metà 2014

Difficoltà:

Moderato

15 - 30 minutes

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@ajcooke01 - Lets not be to quick with replacing the logic board (or any major part) until you have validated it running diagnostics. I'm not saying diagnostics will catch the problem but here it should have.

da

@danj You may want to re-read the question. The OP has done diagnostics “Apple Diagnostics are also perfect, zero hardware issues shown.”.

da

@danj

Indeed the hardware test from Apple Diagnostics did tell me only that the power cable was not plugged and gave me the chance to do it again and test it, but i skipped that step.

but my battery have only about 100 cyles, so it is in really good shape.

@ajcooke01

i already tried to boot with an external SSD on USB and the same problem shown with freezing.

Maybe i can test it again but this time taking the original SSD out the mac and start up only with USB External Drive.

da

@ajcooke01 & Aldo B - The Posting was quite fragmented so I jumped a bit and missed the diagnostics was done.

So the issue is focused on the HDMI connection being the factor here.

da

Aldo, I would try that and see if you have any luck. If that goes to no avail it probably is the Logic Board.

da

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Aldo B sarà eternamente grato.
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