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Modelli A1419 / Fine 2012 / Processori 2.9 & 3.2 GHz Core i5 o 3.4 GHz Core i7, ID iMac13,2

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Black screen and a fan at a full speed after waking up my iMac

Late 2012 Imac A1419 EMC2546 after trying to wake it up gave me a cloud of dust as fans kicked in at a full speed and screen is black.Power button works turns iMac off and on but fans keep running at a full after it turns on.Screen is black with no signs of life…after turning computer off i could hear some slow fan running …

…at the moment have a screen removed and trying to find out if some heat sensor giving me this problem ….

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Is this after completing a repair of some kind, or did it just "randomly" happen?

da

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Try an NVRAM reset (Option+Command+P+R), typically resolves display issues if it isn’t a hardware issue with the display itself: https://support.apple.com/en-us/HT204063

Also try an SMC reset: https://support.apple.com/en-us/HT201295

If that gets the display running, next run Apple Diagnostics, which should show any issues with thermal sensors: https://support.apple.com/en-us/HT202731

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NVRAM and SMC reset did not help,unfortunately....

And yes this happened just randomly...Id say its a hardware issue...

da

Have you tried an external monitor?

da

No i haven't....let me try that ! ...need to figure out how though....

And thank you for helping me!

By the way does anyone know what type of LCD thermal sensor is ? Is it resistive ,semiconductor based?

My multimeter is showing as an open circuit or no resistance at all....if it is a resistive then thats it ,found it....at least one problem.....i hope :)

da

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Aidas Jakubenas sarà eternamente grato.
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