AC adapters keep dying

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Lenovo Legion Y540-17IRH

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Larris @larris

Репутация: 1

Опубликовано: 7 июн 2021 г.

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AC adapters keep dying

So I've done a thorough amount of background research to little to no avail on this topic. Basically this is what's going on: the AC adapter functions perfectly normal at first then over a series of months the pin out and power port on the laptop gets extremely hot under load eventually the pin stops charging the laptop correctly without being angled in and after that it'll stop working entirely. Yet when I buy a new AC adapter that works perfectly fine for a few months until the problem repeats itself. I've taken apart laptop and thoroughly examined the port and it looks undamaged isn't missing any of the pieces as far as I can tell (black plastic bit and side prongs are still there). The only thing I know for sure is that this is a very widespread problem in this particular laptop, is it because the poor is malfunctioning or is it the quality of the materials in said adapter causing extreme heating and cooling leading to damage and shrinkage?

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jayeff @jayeff Репутация: 448,1к 11 366 1,4к · Answer 1 · 2021-06-08T00:03:42-07:00

Hi,

Have you tried changing the DC-In jack (supplier example only)?

Localized heating of components in electrical circuits can sometimes be due to a voltage drop across the component caused by a resistive connection when perhaps there shouldn’t be one e.g. a resistive connection between plug and socket due to lack of tension in socket spring terminals or incorrect sizing between the two (plug and socket) or perhaps an internal dry joint connection in the socket itself.

It could also be caused by excess current flow through the component. This current may not be enough to blow a fuse perhaps but over time may be enough to damage the component. The charger specs state that the output is 8.5A/11.5A so presumably the socket should be rated to handle the higher value

Normally the resistance between the input and the output sides of a DC-In socket would be either 0.00Ω (short circuit) or no more than approx. 0.03Ω.

Without a schematic for the motherboard (I couldn’t find one - is it a FY715 NM-C541 motherboard?) it would be hard to find a suitable testing point, just after the DC-In jack output connections (presumably hard to access on the socket itself) to test to see if there is a voltage drop between the input to the jack and the output of the jack i.e. measure the voltage at the adapter plug before insertion into the jack and then measure the voltage at a suitable point very close to the output (motherboard side) of the DC-In jack.

Just what I’d try.

Lenovo Legion Y540-17IRH

AC adapters keep dying

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