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I am trying to replace a broken (transparent oil-like fluid leaking) power supply adapter for a Huawei Mateview (28') monitor and multiple declarations for the output wattage and voltage are causing me confusion. enter image description here

If I can't find an official replacement, am I fine simply buynig a 135W & 20V adapter from a different brand with a USB-C plug? I tested it with a 96W, 20.5V adapter and it did not power on. The official website describes the power adapter as a 135W USB-C power adapter so I am guessing I need 135W then, but the label with multiple options was confusing.

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    The best method for finding out would be to contact Huawei tech support, as it guarantees 100% accurate info. I definitely wouldn't change to an adapter with wattage above 75W without contacting Huawei, as that's generally not possible when a DC power supply is involved since it would supply more voltage and/or amperage than the device is intended to handle. Since the power brick outputs at a maximum of 15V @ 5A [75W], a 135W supply is likely not okay - the brick is supplying either 3A or 5A at varying voltages, 5V or 9V @ 3A, 12V or 15V @ 5A. Ohm's Law: V[olts] x A[mps] = W[atts] [V*A = W]
    – JW0914
    Commented Aug 15, 2023 at 11:55

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No, you cannot just use any USB-C power adapter. This is a proprietary power adapter that supports both standardized USB-C Power Delivery (limited to 5 A at 20 V) as well as a proprietary extension to 6.75 A. You should get a new adapter from Huawei. It's the only way this is guaranteed to work.

USB Power Delivery supports negotiating voltage and current requirements, that's why all these combinations are printed in the power supply. However, more than 100 W must use higher voltages according to the spec.

Proprietary power supplies are very common with USB-C because many laptops need significantly more than 100 W. The higher-voltage specs however where only released in 2021.

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  • .... I'm not surprised someone messed up a perfectly good standard but how would one know its not a standard voltage/amperiage combination?
    – Journeyman Geek ♦
    Commented Oct 8, 2023 at 13:18
  • @JourneymanGeek Because it exceeds the maximum allowable USB-C connector current of 5 A.
    – Daniel B
    Commented Oct 8, 2023 at 14:02

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