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The label of a power adaptor is damaged so no information if the input voltage is 110V only or 100-240V range. The output is 500mA at 5.5V.

I would like to use the adaptor in a 220V country. How can I test/measure the input range of the adaptor and check whether it can be used with 220V?

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  • \$\begingroup\$ Google image search of the same device or reverse engineer the pcb \$\endgroup\$
    – PlasmaHH
    Sep 4, 2015 at 6:35
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    \$\begingroup\$ Why take the risk? Throw it away and buy another one. \$\endgroup\$
    – Roger Rowland
    Sep 4, 2015 at 6:36

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You cannot be sure ! And it might work, for a short time, and fail when you think it's OK. So indeed the best advise is to throw it away and get a proper 240V rated adapter. Why risk fire or whatever when a proper adapter is cheap to buy and is guaranteed to work safely ?

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  • \$\begingroup\$ Thanks for the replies. Yes to replace the original one is the easiest way but I was wondering if there is a technical method to determine the input voltage as well. Again thanks for all the replies and sorry if it was off-topic.. \$\endgroup\$
    – Rak
    Sep 6, 2015 at 20:28
  • \$\begingroup\$ There is a technical method in then you would need to reverse-engineer the adapter and look at the ratings of all the componets. That would still not be a 100% guarantee though. And most adapters cannot be safely opened and closed again. Geeting a 240 V rated one is the better option. \$\endgroup\$
    – Bimpelrekkie
    Sep 7, 2015 at 8:22

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