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Hey everyone,
Received a late 2009 Mac model 10,1 for a repair, the screen was disconnected but after reconnecting there are bars of pixels randomly coloured, looks like wall paper. See attached
Any help would be greatly appreciated!
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Hi there, after a bit of thinking I decided to tear down the iMac and bake the GPU in the oven. This managed to reset the solder and made the lines go away.
I followed the ifixit guide to tear down the machine to get at the GPU, removed thermal paste. Then placed the GPU on a baking tray supported with pillars of tinfoil. I baked the GPU at 200⁰C for 15 minutes then reassembled the iMac and to my surprise it booted :D
Thanks everyone!
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Not good ;-{
You have proved the issue is within the GPU logic. I'm suspecting the VRAM chips need replacing. If you have a hot work station you could try reflowing the chips with some fresh flux/solder and hope fo the best. Follow this guide iMac Intel 21.5" EMC 2308 Logic Board Replacement to take it out. Otherwise its time for a new logic board.
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6 Comments
What does an external display look like? Is the image clean on it?
by Dan
@danj I wouldn't have any way of testing that, I don't see any hdmi or vga ports on the back.
by Millerbes
@millerbes - Mac's use mini DisplayPort connections which then can connect via an adapter to VGA or HDMI. You'll need to grab one.
by Dan
@danj - Alright, just ordered one, be here by tomorrow, i've installed a spare HDD into the mac, going to install some sort of headless linux OS onto it for now. Can I plugin my windows USB keyboard into the mac? and what key combo would it be to bring up the boot device screen?
by Millerbes
@millerbes - How about just installing the proper OS for the system, so the system is more useful. You can go upto macOS High Sierra (10.13.6)
Go here to get it: How to get old versions of macOS
Follow this guide to create a bootable USB thumb drive (32GB)How to create a bootable installer for macOS
by Dan
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