iMac starts up with black screen.
Hello,
My 2017 iMac 21.5” 4K does not show pictures on display any more.
It powers up with the chime but shows nothing on the display. It is not a backlight issue. NVRAM clear and SMC reset were tried but no luck.
I can login remotely using ssh. If I try screen share, it only shows black desktop on a remote computer.
An external display does not show pictures either. But I am not sure if the USB-C to HDMI dongle is recognized.
I opened it up to see the diagnostic LEDs and I see that 3 LEDs are lit. I replaced the button battery with a new one but no luck. I also replaced thermal paste on the CPU, GPU and VRAM but no change (which is expected).
So my question is that is there any way to run hardware diagnostics remotely? If not, what’s the next move I should take?
Thanks,
Tatsuya Minami
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1 commentaire
I have an update on this iMac.
I bought an IR reflow machine from Amazon.
https://www.amazon.com/gp/product/B08R3P...
And reflowed the GPU and the VRAMs. I followed the procedure in these videos.
https://youtu.be/j67Z9D0rs5s
https://youtu.be/UOoR27IF7Jk
After the reflow, my iMac started up with a picture on display!
Hope this information helps some one who's having the same problem.
Tatsuya Minami
par Tatsuya Minami