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Open Roads Forum  >  Class A Motorhomes

 > New led TVs need to run on true sine wave inverter

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garym114

Bluff Dale, Texas

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Posted: 04/08/12 10:51pm Link  |  Print  |  Notify Moderator

Doesn't make any difference, the kind of TV, LCD or LED. Nothing in either TV actually runs on AC. The AC is converted to DC in the TV and that is what everything in the TV runs on, just like your computer or laptop, everything actually runs on DC.
Have the guy explain why a MSW inverter will decrease the life of the TV. He can't.


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FIRE UP

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Posted: 04/08/12 11:12pm Link  |  Print  |  Notify Moderator

Gents,
We don't have an LCD/LED TV at present but, this kind of info is neat to know. I don't remember what our present inverter is as far as MSW or PSW. I think it's good info here. I've never really understood the "MSW" and "PSW" stuff anyway. Electronics have always eluded me. If I can't see it, touch it, (sort of) and put it in a container, it's hard for me to comprehend it.

In solid things like, liquids, metals, wood, and other type stuff like those, I can see, feel, touch, measure, and more. Anyway, not getting too far off the subject matter here. Apparently if, and I hope this doesn't happen all too soon, we have to get a new inverter, I guess it sounds like I'd be good to search for a PSW unit huh? So, thanks for the info.
Scott



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ewarnerusa

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Posted: 04/09/12 09:22am Link  |  Print  |  Notify Moderator

My brand new LED TV makes a terrible loud buzzing sound from the back of the unit when plugged into power from a MSW inverter. Not from the speakers when turned on, but continuously while it is plugged in whether it is turned on or off. With PSW inverter power (and shore power), no buzzing. That answered the MSW or PSW question for me.
To obfuscate things, I am running "cheap" PSW inverters from ebay. My 300 watt unit works perfect with no buzzing from the TV, the 1000 watt unit results in a quieter version of the buzz from the TV. So the 300 watt unit will have TV duty and the larger inverter will provide power for everything else when needed.


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jvander

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Posted: 04/09/12 08:16am Link  |  Print  |  Notify Moderator

The temperature and humidity fluctuations in an RV make a hostile environment for electronics and will probably shorten the life of an LED TV more than a MSW. And chances are pretty good that TV technology will change and you'll want a new TV in 3-4 years regardless. Most computer UPSs are MSW and they run PC power supplies and monitors without an issue.
Garym114 is right. The TV's power supply converts the AC to DC anyway, so I doubt that an MSW inverter will shorten the life of an LED TV. It may shorten the life of the TVs power brick however. I can testify that my laptop's power brick runs much hotter on a MSW inverter than a PSW inverter.


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ped

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Posted: 04/09/12 04:12am Link  |  Print  |  Notify Moderator

If anythinng an LED TV would accept MSW much better than a typical unit. But that's a moot point. I too would like to hear not only the logic behind this claim but actual proof.

Lets not even mention that if it were true, which is highly doubtful, I could buy a couple dozen small LED TV's for the price of a good pure sine wave inverter. lol

billyboy

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Posted: 04/09/12 04:28am Link  |  Print  |  Notify Moderator

ok, i'll add to this. i have a 52" lcd and it won't run on a 475 watt msd, and the tv only draws 140 watts. do i need a psw


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deandec

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Posted: 04/09/12 09:30am Link  |  Print  |  Notify Moderator

My cheap Vizio LED/LCD tv's run fine on my 17 year old 2500W Inverter.

Buy the TV. Try it. If it lights up and works normally, enjoy it.

If not, go back to the CRT or get the PSW Inverter.

Life is too short to worry about the "what if".


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Jim@HiTek

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Posted: 04/09/12 10:09am Link  |  Print  |  Notify Moderator

MSW (Modified Sine Wave) inverters output a stepped version of a sine wave. There may be many steps (relatively expensive MSW) or just a few. This allows the use of lower wattage & less expensive output devices.

The issue is spikes and sags that can occur with a poorly designed system. If there are spikes in the output waveform, they can easily surpass the voltage ratings of downstream devices inside of other electronic devices. Those devices may exhibit buzzing from the speakers or lines in a picture or other anomalies. Although many modern electronic components have 'head room' for this sort of thing, such spikes can & do prematurely age components.

The expected life time of those downstream components is solely dependent upon the quality of the components used in the design.

If you use a MSW converter, and see or hear NO anomalies, it would be safe to use and would probably NOT decease the life of the component.

As with any electronic device, the more you pay for a MSW converter, the better it probably is.


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wa_desert_rat

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Posted: 04/09/12 10:23am Link  |  Print  |  Notify Moderator

garym114 wrote:

Doesn't make any difference, the kind of TV, LCD or LED. Nothing in either TV actually runs on AC. The AC is converted to DC in the TV and that is what everything in the TV runs on, just like your computer or laptop, everything actually runs on DC.
Have the guy explain why a MSW inverter will decrease the life of the TV. He can't.


+1 on this. If it's an overheating problem you can usually tell by putting your hand on various areas at the back of the tv set. But like garym114 says, only the power supply for the tv runs on ac; everything else runs on dc. The only issue I can foresee would be whether the power supply does not react well to MSW current and that would probably manifest itself in greater heat.

Craig

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Posted: 04/09/12 10:37am Link  |  Print  |  Notify Moderator

wa_desert_rat wrote:

garym114 wrote:

Doesn't make any difference, the kind of TV, LCD or LED. Nothing in either TV actually runs on AC. The AC is converted to DC in the TV and that is what everything in the TV runs on, just like your computer or laptop, everything actually runs on DC.
Have the guy explain why a MSW inverter will decrease the life of the TV. He can't.


+1 on this. If it's an overheating problem you can usually tell by putting your hand on various areas at the back of the tv set. But like garym114 says, only the power supply for the tv runs on ac; everything else runs on dc. The only issue I can foresee would be whether the power supply does not react well to MSW current and that would probably manifest itself in greater heat.

Craig


Heat is the enemy of electronic devices. Heat tends to allow the smoke to escape. Once the device loses its smoke, it often quits working. Allowing the smoke to escape often allows the sparks to escape also. Once the sparks escape, the device is done for.
The smoke and sparks must be firmly retained. Never allow them to escape! (I would have put a smiley here, but I couldn't make the fool thing work!)


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