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the old TV took my daughter and I to carry it out on the motorhome and the new TV weighs 12 lbs. so there is also a weight savings of about 60 lbs. There already was a 12 VDC cigarette lighter plug right there behind the old tv so all I had to do is buy a 12 volt accessory plug and put it on the TV power cord.
In my Tioga class C I have a 19 in. Model 1907 Jensen tv that operates on 12 volt and 110 AC. Unlike other rv'ers, I do not like inverters. I also have a 12 volt DVD player hooked up to the tv. I can use both for about 4 hrs. before the house batteries (two 6 volt batteries) need charging.
Perhaps the TV is expected to run from 120 VAC using a small 12 volt inverter somewhere. If the inverter is not working, the TV will only work on when you have 120 VAC available. Just a guess as I am not familiar with your setup. But I assume the TV is a 120 VAC only TV. That means the inverter needs the 12 VDC to make the TV work from battery.
The TV is AC and DC compatible, but I will need to find a DC power source near the TV to plug it into. There is a radio nearby in the adjacent cupboard that I may be able to piggyback power from. May 30, 2021
I switched both our TVs to Samsung 12 volt TVs, bought SONY Blu-Ray players that run off 12 volts for each, got a nice JVC stereo that runs off 12 volts, and got 12 volt power cords for our computers. No inverters needed any more. Much more efficient.
12 volt power is sent up the coax to the preamp located in the antenna's plastic housing - the circuitry behind the wall plate is just the power supply and a signal splitter. The warning about only using the wall plate with an amplified antenna means don't use it with a conventional TV antenna that's not designed to have 12 volts on it's coax.
It's better to put the filtering at the source, to eliminate the possibility of the 12 volt wiring acting like an antenna and sending the interference into the antenna itself. First thing I'd try is a 0.01 mfd capacitor across the leads going to the fan motor, as close to the motor as possible.
Now the flip side. And I disagree with these folks but the voltage in an RV is not 12. it's 13.6 normally and can go to 14.6 Some folks claim that is too much for a 12 volt TV. Samsung's are 14 volt and work well on 12.. at least the one I have is/does. That said Samsung has gone to SMART Tv's and .. I am not a fan of privacy invading televisions.
I have a grand design 22mle travel trailer. I want to add a 12 volt socket since there are none. I know I could drill holes and access my battery, but just don’t want to to that to a new TT. Is there a good place to access a 12 volt source and a good way to hide the wires in the wall/ceiling...
An extra volt or two won't hurt the TV. There are high current regulators, but all voltage regulators have some overhead. For example, the LM78T12 is common 12 volt. 3 amp regulator. The problem is that it has a typical dropout voltage of 2.2V @ 3A. That means that in order to get 12 V out, it needs to have at least 14.2 V in.