MacBook Air A1466 820-00165-A U3900 Heats up

**mferna14** · 11-30-2021, 05:40 PM

Hi all, I am working on a MacBook Air A1466 820-00165-A. It turns on fine (3.3-5v-1.8V all good), there is a fan spin & the initial startup too, the fans spins stops & then spins again, but no display all. Upon checkup I noticed that U3900 chip Heats up, I measrued a short in this area, C3931 & C3933 shorted. Actually the chip was shorted, this is why the caps were showing 0 ohms. I replaced the chip with a new one but now the chip gets very hot. Is there any reason why is this chip getting hot & no display at all. Appreciate a reply. Thanks

11-30-2021, 05:40 PM	#1
mferna14 Badcaps Veteran Join Date: Jun 2018 City & State: Brampton My Country: Canada I'm a: Knowledge Seeker Posts: 450	MacBook Air A1466 820-00165-A U3900 Heats up Hi all, I am working on a MacBook Air A1466 820-00165-A. It turns on fine (3.3-5v-1.8V all good), there is a fan spin & the initial startup too, the fans spins stops & then spins again, but no display all. Upon checkup I noticed that U3900 chip Heats up, I measrued a short in this area, C3931 & C3933 shorted. Actually the chip was shorted, this is why the caps were showing 0 ohms. I replaced the chip with a new one but now the chip gets very hot. Is there any reason why is this chip getting hot & no display at all. Appreciate a reply. Thanks

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