Remotes & Accessories

Help with Roku remotes and accessories, including pairing a remote, setting up TV power & volume control, using voice commands, power adapters, cables, headphones, and wireless speaker accessories.
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ScottCal
Level 7

Power: 5v v 5.2?

Hi,

I have two Roku premieres. I am moving one around as I have a third tv in my office and I want to keep tabs on the news during the day.

One of my power adapters is plugged behind a piece of furniture and hard to get to when I move the Roku. I have an old USB/wall adapter for an ASUS tablet that is 5.2v and 1 amp—the adapters for the Premiere are 5.0v/1A.

Can I use that slightly more powerful adapter, or might it harm the Roku?

Thank you!

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7 Replies
atc98092
Community Streaming Expert

Re: Power: 5v v 5.2?

5.2, that's an odd voltage for them to choose. Most likely to "force" you to purchase a replacement from them.

Odds are it wouldn't cause a problem, but it's so easy (and cheap) to find a true 5vdc wall plug that I don't think I'd bother. Chances are most 5 vdc wall converters have a little bit of range to them anyway, but like I said I probably wouldn't risk it. 

Dan

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ScottCal
Level 7

Re: Power: 5v v 5.2?

Thanks, Dan. 5.2 *is* an odd voltage. I guess that's true that I can find a 5V one easily. With all the old adapters I have around here, I might even have one from another device that I rarely use... ah ... in fact, you gave me an idea, as I have a lot of portable musical things that have USB adapters. I'll look for an exact match. (Or I'll just buy one.)

Thanks again!

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makaiguy
Community Streaming Expert

Re: Power: 5v v 5.2?

Most chargers only express their nominal output voltage to no decimal places, i.e. 5V, not 5.0V.  5.2V expressed to no decimal places would be 5V also.

Everything I've been able to find online says the tolerance on a nominal 5V USB port is 4.75 to 5.25 volts.  Devices designed to be powered by these ports should be able to handle anything in this voltage range. 

More important is the current output of the power source.  You need to have a charger that can deliver at least the amperage needed to power the device. My three current Rokus all came with 1 amp current ratings.

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atc98092
Community Streaming Expert

Re: Power: 5v v 5.2?

True, all powered devices have a tolerance range for voltage. It's just so odd that they actually labeled it 5.2. And given it's possible tolerance, it might actually have an output of almost 5.5v. I'd test it myself before trusting it to power something with sensitive electronics within. I pulled my old 2 XS out of the drawer (closest Roku handy) and it's labeled 1.5a. Then I dug out my suitcase and checked my Premiere, and while the Roku itself doesn't list a current requirement the power cube is rated at 1a. 

Dan

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ScottCal
Level 7

Re: Power: 5v v 5.2?

Thanks, both of you, for your replies. Yes, that ASUS adapter is 1 amp, which matches the Roku. Maybe I'll try it. I'd hate to blow this out, though. I should go back and check the specs of the tablet that used it (which I no longer have), to see what it requires. Maybe it's also 5V. and so the adapter may be okay.

Thanks!!!!

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p72mad
Level 7

Re: Power: 5v v 5.2?

I know you've figured this out by now, but the DEFINITIVE answer to this is: YES YOU CAN. No 5v device drawing one amp of current is going to be harmed by a 5.2v 1A brick. Think about 12v batteries. Do you charge them to 12v and stop? Of course not. Usually 13.4-14.0. Same goes for that one: nearly every 12v device (in my experience, EVERY) can easily tolerate 14v input provided that the amperage is sufficient.

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p72mad
Level 7

Re: Power: 5v v 5.2?

Also, guys, remember that you do NOT have to "match" the amperage precisely. Matching the voltage (within tolerance of reason) is critical. But with current/amperage, the power source simply must be equal or greater to the requirements of the device. Meaning that a 5v 10A adapter would be perfectly fine for that Roku. It would just draw an amp or less. Amperage isn't forced upon the device; the device takes what it needs.

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