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I have replaced the logic board on my imac (previous question), it seems to work but after ca 5 minutes the screen goes black. When I restart, the same problem after 2-3 minutes. What could be the reason?
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Hi Tony,
Seems like there’s some sort of incompatibility or fault.
Judging by the fact you did a logic board swap it seems you have the tools for these imac repairs.
When this issue occurs, can you shine a flashlight on it to see if theres any image. If so then the backlight connector is not seated properly
If not, try a power cycle (If u don’t know how to do that either i or someone else can explain)
As a last resort try and swap the boards out again and see if the issue continues.
If so then something is clearly damaged hardware-wise and needs replacement. My guess is the display cable is somehow being interfered with.
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thanks for the hints; I will try them out.
I also wonder if the problem can be caused by the graphic card?
I agree with @np_f1_2021 direction you likely have a backlight issue, press the flashlight against the display at a sharp angle if you see the faint image of your desktop and its icons you've isolated this issue to the backlight logic. You could have a bad cap on the LED driver board which I've seen a few times.
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