LCD TV 12 volt power cord

[mrbreeze_az]

I picked up an Insignia 28" LCD TV that has 12 volt input. The TV works well using the residential 120 volt cord that came with it. I bought a 12 volt cord and it powers the TV but has wavy lines going up the screen constantly. Has anyone experienced this? Maybe I need a different power cord? Thanks in advance.

[SCVJeff]

Lynnmor wrote:
He said this: "No, I am using straight battery power."
The converter and shore power should not be part of the discussion.

Check that the polarity is correct for your TV. The cord might have it reversed.

What?
Reversed polarity causes SMOKE, not ripple in the picture

[98coachman]

A friend of mine had this exact thing happen. The 12 volt cord he purchased was too small and had to much resistance to make the tv work properly. He picked up a heavy duty 12 volt cord and end of problem. You may also try to shorten your cord as short as possible first to see if that helps.
Good luck, Bill

[mike-s]

Is this when watching a TV channel, or do you have another video device like a DVD player sourcing the video, and how is it connected?

"Wavy lines" are not a symptom associated with a digital video issue. My guess is either you're using an analog connection (RCA jack - composite video), or the 12V power isn't steady and is effecting the backlight of the TV. If you're using composite video, change to an HDMI connection if possible.

[budwich]

OP, what is your input source? Depending on what it is, you might have a grounding issue.

[Lynnmor]

He said this: "No, I am using straight battery power."
The converter and shore power should not be part of the discussion.

Check that the polarity is correct for your TV. The cord might have it reversed.

[SCVJeff]

ScottG wrote:
It's your converter. It's putting out "noise".
A less likely scenario is you have a florescent or LED light fixture that's creating the AC component.

x2
It's not actually generating "noise" but AC hum which the batteries "usually" adsorb, obviously not here.

If you are watching off air you are likely watching a digital picture in which case LED or fluorescent noise is out since that sort of interfearence will simply mute the receiver.

[ScottG]

It's your converter. It's putting out "noise".
A less likely scenario is you have a florescent or LED light fixture that's creating the AC component.

[RoyB]

Unplug your trailer from shore power and see if that helps...

My older converter did the same thing here if it was turned-on while I was hooked up directly to the battery...

Like said above alot of things are still connected to your 12VDC Battery terminals that can cause interference like this...

You might want to totally disconnect the battery and see if the TV set works fine just connected to the battery without anything else connected.

Of course doing this you may lose your 12V DC signal going to your BATWING built-in Boost Amplifier so your TV signals may go away as well...

Roy Ken

[darsben1]

12 volt fluorescent lights?
a cheap inverter
fans.
can all cause interference

[mrbreeze_az]

No, I am using straight battery power. When I am hooked up I can use the 120 volt cord that came with it.

[Lynnmor]

mrbreeze az wrote:
I picked up an Insignia 28" LCD TV that has 12 volt input. The TV works well using the residential 120 volt cord that came with it. I bought a 12 volt cord and it powers the TV but has wavy lines going up the screen constantly. Has anyone experienced this? Maybe I need a different power cord? Thanks in advance.

If you are using battery power, and not plugged into shore power, there should be no interference. If you are using power while the converter is in operation, that may be the problem.