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Old 03-21-2012, 08:55 AM   #29
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To use a tv that has a 120 to 19 volt transformer I used a 12 volt adapter for a labtop. It had the right plug for the tv. just make shur it has the right voltage output and amp output. Found adapter on Amazon.
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Old 03-22-2012, 04:08 PM   #30
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I am little confused

Ok boon docking without gen or power source our 12volt tvs will not work. So we need an adapter to plug from 12volt cig near antenna power button. Cig 12volts to TV obviously every unit will have different plugs. Do we need to worry about power spikes in cig. The wall sockets do not run through converter right?
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Old 03-22-2012, 07:35 PM   #31
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To use a tv that has a 120 to 19 volt transformer I used a 12 volt adapter for a labtop. It had the right plug for the tv. just make shur it has the right voltage output and amp output. Found adapter on Amazon.
So let me rephrase this and please tell me right or wrong...

If a DC powered device takes anything other than 12V or close to it, then some sort of power adapter (little black box) will be required to change the 12 +/- 1V that our trailers have into as much as possibly 19V or as little as possibly 9V.

If I don't convert it (i.e. get a wire with the cig. lighter on one else and a correct fitting to go into the TV but no little black box) and I still plug it in, will I fry something?
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Old 03-22-2012, 08:20 PM   #32
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All wall plugs deliver 110voltage at least on newer AS

So now all we have to do is hookup 12volt battery source. Only issues I can see are power spikes to tv as it will bring up the power all at once not slowly like those power cords you see on laptops they are 110voltage to what ever your laptop charges some 9v others up to 19volts most 11volts. Remember fully charged battery could be 13.5 volts after charge and drop to 12.71 100percent charge. I called my sceptre company to clarify needs of my new unit, I received zero help. Wonder if they make 12 cig to tv with clean 12volt to 12volt connection with relays or what ever regulate flow. For sure you would never want to plug in 110voltage while having 12volt cig plugged in but should be no problem as there is only one power jack. I am going to see if jensen makes same style end plug for my set.
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Old 03-22-2012, 09:13 PM   #33
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So now all we have to do is hookup 12volt battery source. Only issues I can see are power spikes to tv as it will bring up the power all at once not slowly like those power cords you see on laptops
What make you think that laptop adapters do this?

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they are 110voltage to what ever your laptop charges some 9v others up to 19volts most 11volts.
A little punctuation might help. What is this supposed to mean?

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Remember fully charged battery could be 13.5 volts after charge and drop to 12.71 100percent charge.
???
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I called my sceptre company to clarify needs of my new unit, I received zero help. Wonder if they make 12 cig to tv with clean 12volt to 12volt connection with relays or what ever regulate flow.
I would expect a cleaner 12 volt power supply from a good converter, like a Progressive Dynamics that costs $150 & up and is hooked to two large batteries to stabilize the voltage spikes than I would from a little bitty, cheap, 110 to 12v adapter.
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For sure you would never want to plug in 110voltage while having 12volt cig plugged in but should be no problem as there is only one power jack. I am going to see if jensen makes same style end plug for my set.
Best of luck!
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Old 03-22-2012, 10:02 PM   #34
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I think it is best to leave 120v ac receptacles out of this discussion. They are not a problem; we know how to handle them. Just use the adaptor that came with the electronic device and use it just as you would at home. This assumes that you have a clean 120 ac volts at the receptacles by shore power connection, a generator or a decent quality inverter.

Winestream

I agree the problem is how to power dc electronics that takes something other than 12v. I am sure there is a voltage range on all dc electronics. I don't have a clue what it is. My guess would be within 10%. I don't know if there is a black box adaptor that would take 12v at the inlet and adapt it to a specific voltage at the output, like 5v, 9v or 19v. Maybe one of the electronics gurus will chime in and help us.

Dan
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Old 03-22-2012, 10:32 PM   #35
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I found some dc convertors online to go from 12 to 19v or 12 to 5v and they were $50-$150 each, so that is not going to fly.

I think I will just charge my laptop using a small inverter to go from 12v dc to 120v ac and then charge my cell phone off the usb connection on the laptop.

Dan
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Old 03-22-2012, 11:05 PM   #36
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I have a polaroid tv that has a 120 plug with a black box that coverts the 120 to 19v dc. I checked my toshiba laptop and it had the same setup. I found an adapter at amazon for the laptop for about 20.00. It worked great on the laptop and the tv. Here is the same one that I bought on ebay for the same price. PWR+ CAR CHARGER FOR TOSHIBA SATELLITE A665 C650 L505 L730 L755 P755 LAPTOP 90W | eBay
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Old 03-23-2012, 12:11 AM   #37
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Anthony- Good find. That is better than using an inverter. I found an adaptor for my HP laptop Pavilion dv6-6110 for $32.65 from:

www.laptoppartsnow.com

Looks like they can provide a car charger for most any laptop.

Dan
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Old 03-23-2012, 06:06 AM   #38
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It think maybe the topic here has gone somewhat arwy. But then maybe I am the one off topic and need to take the thread somewhere since I'm not so concerned about the TV as I am how to power it.

We're discussing how to power a TV from the 12V DC system of our campers. Not from the 120V AC. Pretty much anything you buy will have a 120VAC converter to some level of DC. As some have pointed out in this thread (thank you), there are TVs readily available out there that come with an external converter which makes it much more possible to power your TV from the 12VDC circuit of the camper.

The discussion here and still an open question that hopefully an electrical person will pop in an answer is: how to power that TV when you can't use 120VAC but the TV requires a DC voltage much different than the roughly 12V that our trailers have on a full charged battery.

Dan, I'm by no means pointing the finger at you for an answer so please don't feel that you must reply to each of my posts.
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Old 03-23-2012, 09:13 AM   #39
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My 23" Viore has a little black box converter that clearily states 120vac to 12vdc. I cut the output wire to the TV and soldered it to a cigar lighter plug I obtained from Radio Shack. This plugs into the recepticle located near the cable plugs, and delivers 12dc from the battery. The TV has been running fine for almost two years now and I like it when boondocking. I'm sure all TV's of this type as do computers, have built in voltage regulaters.
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Old 03-23-2012, 10:28 AM   #40
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No problem Jason. I will only post if I think that it has merit.

Sounds like we have the 12v and 19v tv's covered. What other dc voltage tv's are there out there? Do you have a particular tv in mind that has other than 12v or 19v as input to the tv?

Dan
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Old 03-23-2012, 11:23 AM   #41
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Back to the original post. I got the latest catalog from CW several days ago. They have several Jensen 12 v. TV's and at least one of them has a DVD player. I guess the antenna booster in the main cabin would work for a bedroom TV and I think it works on 12 v.

I'm thinking of a bedroom TV and wondering if this is really necessary. Do I need TV when boondocking? Do I need one with a DVD player? Maybe I don't need a color TV. Did I need an Airstream? I'll ask my wife what I need—she always knows.

Gene
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Old 03-24-2012, 06:02 PM   #42
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The 12v Vizio tv that I bought last year at Sams is no longer available. However there is a 12v Viore 22" tv for $169 at Sams that looks good. It is also very energy efficient as it only requires 3 amps (36 watts). See the photos below:

Dan
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