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Old 07-04-2021, 08:55 AM   #1
marce002
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Default Macbook A1286 2010 gpu UMA doubt

Hi

I have some a1280 820 2915 boards no one gives image at all... but they turns on and chimes.
It is very likely to be GPU issue so wanted to follow jumper gmux converting to uma way...

My question would be: is this posible? since they dont give video ...no backlight...no gray or white screen no logo...
I mean chime is heard ...fan spins .. mac is on but no image...

Is uma conversion posible only when you have primitive video? Or can be the case when you do not have video at all?

Thanks in advance.

Last edited by marce002; 07-04-2021 at 08:57 AM..
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Old 07-04-2021, 02:45 PM   #2
piernov
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Default Re: Macbook A1286 2010 gpu UMA doubt

Yes.

820-2915 = A1286 2011
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Old 07-04-2021, 02:52 PM   #3
marce002
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Default Re: Macbook A1286 2010 gpu UMA doubt

Piernov your YES answer means that i can try to do all the jumpers method *1 even when no video ? (No logo no white screen but chimes)

*1 https://forums.macrumors.com/threads...ypass.2134019/
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Old 07-08-2021, 06:46 AM   #4
marce002
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Default Re: Macbook A1286 2010 gpu UMA doubt

ok fixed 2 1286 820 2915 with the method assuming your answer like yes, and worked fine, lot of jumers no bright but works! now i need to do a 820 3330 but seems to be different. thks
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Old 07-08-2021, 12:15 PM   #5
piernov
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Default Re: Macbook A1286 2010 gpu UMA doubt

820-3330 GMUX circuit is the same as 820-2915.
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