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The Lenovo YOGA 730-15IKB is a 15" foldable laptop with dedicated graphics and a high-resolution touchscreen. Released in early 2018. Model number 81CU0009US.

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Laptop suddenly heats up when charger added.

Hey, my laptop is actually a Yoga S730-13IWL but it was not an option to pick.

The laptop could be running at a steady 45-50c unplugged while I am doing minimal tasks (simply browsing the internet or writing a word document) but when I plug it in the fan immediately kicks in (very loudly) and it heats up insanely fast.

Today, it went from 45-50c unplugged to my CPU hitting 90c within minutes of being plugged in, all the while the fans were going crazy. Any help on this issue would be fantastic, thanks.

Also, the fan was making a very loud sound yesterday, almost as if it was hitting something inside the laptop but this may be unrelated and has not happened today. Just thought id throw it in there.


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Hi @em111 ,

First check that the AC adapter’s various voltage outputs are OK.

Here’s the hardware maintenance manual for your laptop. Go to p.21 to see how to do this and what the voltages should be.

If you haven’t got a DMM (digital multimeter) or know someone who has and knows how to use it, try getting hold of a compatible AC adapter and check what happens using it. (read the specifications that should be printed on the adapters and compare to make sure and obviously the plug has to be the right one)

If the voltages measure OK or if a compatible replacement adapter causes the same symptoms, then there may be a problem with the power supply circuits on the motherboard.

The laptop would have to be opened and tested to determine what the problem may be. The manual will help you to open the laptop and at least to do a quick visual of the motherboard, to see if anything obvious is wrong, e.g. burnt out components etc. If you decide to do this and see something or you’re not quite sure post some close up images of the motherboard back here. Here’s how to do this on ifixit Bilder zu einer vorhandenen Frage hinzufügen

Has the laptop gotten wet or been dropped at all?

If doing all this seems too daunting, contact a reputable, professional laptop repair service and ask for a quote to repair the laptop.

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Emily wird auf ewig dankbar sein.

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