[help] a1708 820-00840 dead

[phantomEVO]

please i don't know where to start!

look at the video...

https://vimeo.com/717524763

what can i do?

[mon2]

Re: [help] a1708 820-00840 dead

From where is the background noise coming from ? Is it from the speakers of this laptop ?

What is the history of this unit ?

Does the cap-lock key LED turn ON / OFF ?

Is this unit power cycling or will remain to consume the same current after turn on ?

[phantomEVO]

Re: [help] a1708 820-00840 dead

background noise....is outside...

hystory is increasly "random reboots" in the course of last months. now completely dead


caps doens't turn on

about power cycling...look at this video...

https://vimeo.com/717602413


i can say that if i disconnect the battery and reconnect it, and try to power on, i can feel that cpu become a little bit warm...

If i disconnect battery keep pushing power button and reconnect the battery, fans will go to full speed

macbook comes with an hub usb/hdmi/lan adapter. if i connect this adapter, it seems that mac go in bootloop (display of power metere go on and off)

with my adapter no problem at all


ps i don't know if it is a coincidence, but after i have done check you have ask for, cpu is ultra hot!!

[mon2]

Re: [help] a1708 820-00840 dead

macbook comes with an hub usb/hdmi/lan adapter. if i connect this adapter, it seems that mac go in bootloop (display of power metere go on and off)

Disconnect this adapter - most of them are crap designs.

Try again to see if the unit boots or still boot looping. CPU hot may be a hint that the processor is toast.

[phantomEVO]

Re: [help] a1708 820-00840 dead

like i said, with my adaptor or without any adaptor , it doesn't bootloop


the video i've posted show how it work with my adapter or without any adapter

[mon2]

Re: [help] a1708 820-00840 dead

If fans are running full blast, you have performed a SMC bypass.

https://discussions.apple.com/thread/8050875

[phantomEVO]

Re: [help] a1708 820-00840 dead

i've discovered something...it is not totally dead.

when i power it on, i have backlight with no image. no CAPS LOCK, but i can click on trackpad. no fan spin. and after some minutes, cpu become hot (i think because fans don't spins)

if i disconnect the battery, reconnect and connect power supply, fan start spinning some minutes

[phantomEVO]

Re: [help] a1708 820-00840 dead

solved booting from usb...

[mon2]

Re: [help] a1708 820-00840 dead

Can you post the resolution?

[phantomEVO]

Re: [help] a1708 820-00840 dead

yes

i've booted from usb, fixed the ssd via recovery and reinstalled the Operating system