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Open Roads Forum  >  Technology Corner

 > "12 Volt" TVs

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HandyRandy

Northern Colorado

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Posted: 04/08/12 05:06pm Link  |  Print  |  Notify Moderator

Hi,
I have a Magnavox 15" TV in my 11' Lance. It was installed when I bought it and plugged into the AC Outlet. So, when boondocking (or Walmarting), I ran the generator to watch DVDs. I'm a retired EE and love tinkering, so I followed the power cord from the plug to the transformer bulge to the output to the TV. The transformer bulge says Input 120VAC" and "Output 12VDC"!! So, I just built a new power cord with the appropriate coaxial power connector and now can run the TV (for awhile at least) without the generator.

I would like to be able to watch over-the-air TV when signals are available. I know there are "12 Volt" TVs, but they seem to command a premium.

So, the question: Have any of you found a 15" - 19" digital ready LCD flat screen with the same set up as my Magnavox? It is spec'ed as 120VAC, but the input to the TV really is 12 Volt.

Thanks for your help.

PapPappy

Wilmington, NC

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Posted: 04/08/12 05:22pm Link  |  Print  |  Notify Moderator

I would think that you should still be able to watch a nights worth of television with the TV plugged into 110VAC inverter. You would probably need two batteries, if you want it all night, with other lighting.

As to your question, I would suggest when you pull into Walmart to overnight, that you walk inside and look at the back side of the TVs on the wall.....you should be able to see how they are powered.

Take care, Happy Camping


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camperpaul

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Posted: 04/08/12 05:34pm Link  |  Print  |  Notify Moderator

My 19" Vizio works the same way as your Magnavox.

Got it at Target about 18 months ago.


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1rosario

Phoenix, Arizona

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Posted: 04/08/12 08:59pm Link  |  Print  |  Notify Moderator

So your saying we might not need an inverter?
we have a new 26" Vizio LED, I'll have to check on the input. But in case it is 12v, could you show me a pic of what you did?

We'd like a way for the kids to watch TV on the road or boondocking without running the generator all the time. I Suppose this is a cheaper alternative also, over the inverter?





midnightsadie

ohio

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Posted: 04/08/12 06:21pm Link  |  Print  |  Notify Moderator

I did the same as you, but bought one with a built in dvd player.wors great and bought it at wal mart.

HandyRandy

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Posted: 04/08/12 08:06pm Link  |  Print  |  Notify Moderator

PapPappy wrote:

I would think that you should still be able to watch a nights worth of television with the TV plugged into 110VAC inverter. You would probably need two batteries, if you want it all night, with other lighting.

But, you lose a lot of efficiency in the DC -> AC (inverter)conversion only to burn up more electricity as heat changing it back to DC. I save battery running on 12 Volts.

Thanks for the rest of your answer.

1rosario

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Posted: 04/08/12 10:48pm Link  |  Print  |  Notify Moderator

Thank you, handyrandy.

DH and I are going shopping for one tomorrow.

Thank you.

1rosario

Phoenix, Arizona

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Posted: 04/09/12 06:54pm Link  |  Print  |  Notify Moderator

Bummer. Our LED Vizio has a 19v output. Guess we'll have to go with an inverter as previously planned.

Kalabin

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Posted: 04/10/12 12:20am Link  |  Print  |  Notify Moderator

Try to find a brand called "Naxa". I found one at my local Fred Meyers store for around $200 on sale. It works as you describe, native it's a 12V DC system but uses a 120V AC to 12V DC rectifier "Brick" if you are using it at your house.

What is nice is the TV actually came with the cables for both the 12v direct to a standard car / RV outlet or 120V AC Plug.

Our TV is a 23" with a built in DVD player.


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HandyRandy

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Posted: 04/08/12 09:38pm Link  |  Print  |  Notify Moderator

1rosario wrote:

So your saying we might not need an inverter?
we have a new 26" Vizio LED, I'll have to check on the input. But in case it is 12v, could you show me a pic of what you did?

We'd like a way for the kids to watch TV on the road or boondocking without running the generator all the time. I Suppose this is a cheaper alternative also, over the inverter?


I just found the same style connector that plugs power into the back of the TV at a local electronics store. They are usually Coaxial Power Connectors Wiki about Coaxial Power Connectors (Radio Shack has them, but theirs get poor reviews). The little drawing on your transformer - the one with the partial circle around the dot - will show you how to connect the + and -. I just used some doorbell wire and soldered one end to the power connector. NOTE: with a 26" LED TV, you may need to use thicker wire - check the current output on the transformer. It should say something like 5.0 DCA (DC Amps). Use heavy enough wire for the current. I connected the other end of the wires into the same 12V circuit as my stereo (so it is on the same fuse) and plugged it into the TV. Voila - inverter free TV.

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