iMac A1312 EMC - Black Screen/No Chime
Happy New Year to you all.
I have a friends iMac A1312 sitting here which suddenly displayed no screen and they then placed it in storage for the 6 months.
I took it home a few days ago and when hooked it up, it continues to do the same thing. I can hear it start but the screen is completely black and can’t hear the Apple chime either.
When I held a torch to the screen I can’t see the backlight. Over the last few days I have taken the machine completely apart and thoroughly cleaned it as it was super dirty but to no avail.
Without the LCD screen attached to the iMac and turning it on to test I can see the onboard diagnostic LED’s on the logic board light up. However only 1 (from the left) and 2. Number 3 and 4 remain off.
I can hear no chime/sound however it seems to me that the HDD and the Optical Drive are working. While cleaning I was unable to take the video card out as it appears riveted on one side. My guess is, its either the video card, or the LED Converter board (hope I said that correct) that’s bust?
Update (01/12/2019)
I solved this issues with the iMac working perfectly. I removed the video card, removed the thermal paste, baked it for 7 minutes on 200 degrees in the oven. I cooled the card, then sprayed it with electrical spray. I bought new thermal paste, also put new paste on the CPU. Put the entire iMac together and turned on the display, chimed and made its way to the desktop. :) :) Extremely happy!
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댓글 2개
Please confirm that only #1 LED lights up.
mayer 의
To mayer, yes LED 1 lights up...constantly...even in off mode and sleep mode
Mark Kiwi 의