USB powered LED light strip

Old 11-16-16, 01:33 PM
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USB powered LED light strip

I have a 3m USB powered LED strip to go behind my Panasonic smart tv, the USB port is 5v and the lights are listed as needing 5v so I don't see a problem but I get a message on my tv saying "over current error on USB device occurred".

The lights work fine on other USB devices, does the length of the strip make a difference to how much power it consumes?
Would a USB charger like the iPhone charger be safe to use?

Can anybody shed some light on why this is happening?

Thanks in advance

Last edited by Jujuman03; 11-16-16 at 03:15 PM.
Old 11-16-16, 06:06 PM
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How many miliamps does the strip draw. Any 5 volt wall wart that exceeds that should work.
Old 11-16-16, 06:40 PM
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USB 1.0 and 2.0 specs that a port must be able to supply at least 500 milliamps at 5 volts. For USB 3.0 the minimum is 900 ma. Many newer device can supply more.

But I have come across many older devices that cannot even supply 500 ma.

So either your strip draws more than 500 ma and the TV is turning off the port to protect it, or the port is one of those that doesn't meet the spec.

As Ray states, a standalone 5 volt wall wart would be an alternative.

Shortening your strip will lower its current requirements. If you know what it draws or can measure it, you will know if it's worth shortening the strip. It should be roughly proportional...cut it in half and power draw will drop in half.

Last edited by CarbideTipped; 11-17-16 at 06:23 AM.
Old 11-16-16, 08:47 PM
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I'd highly recommend using a separate power supply and not the TV.
Old 11-17-16, 08:03 AM
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Yea, the last thing you want to do is strain the power supply or circuitry in the TV. I'd just get a wall wort USB power supply and use that. Unfortunately it will not turn on and off with the tv.

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