Top 20 LG 47LC7DF 47 in. LCD HDTV - Page 5 Questions & Answers

You have a defective power supply, most likely faulty electrolytic capacitors on the power supply board. The board can be repaired, I fixed one for a friend, it took 2 new capacitors $0.90 each.

Ur sound card have burn part,replaced parts or the whole board.

Is it connected to an antenna? Did you do a channel scan for digital channels? See www.dtvanswers.com or http://dtv.gov/iguide.htm for more information.

IR senor may not be bad. Try using a different remote (universal) and program to TV. If universal remote works and your doesn't, you may need to purchase a remote instead of IR board. If you confirmed that the IR board is bad then replacing the IR board will fix the remote issue. IR board is an easy fix. Just open the back cover out and it's located right in the middle toward the bottom of the TV.

Failing Ic's on the control board

Could be the power supply gone bad.
No easy solution I'm afraid.

Seems to be a common problem with these 47 LG models. There were some models recalled recently ny LG. If you contact LG and comlain about this problem ypu may be able to have it fixed Its faulty control boards

This could be a bug in the firmware. LG has a firmware upgrade which is loaded onto a USB stick and plugged into the HMDI port and the TV is reflashed. Try going into the menu and doing a factory reset. Just incase the TV has somehow gone into a diagnostic channel search mode. This may clear the problem.

We had the same problem of pathetic sound quality and volume with a sony brava. Thats just the way they make tv's these days because most people buy a surround sound system as well. We bought logitec computer surround sound speakers for about $140 and plugged into the ear jack, problem solved, we have heaps of volume and stacks of bass.

Do all your programming with the original remote & then set the ATT umiversal remote to turn the set on/off & it should do most of the features of the original. Some stuff can only be done with the oem remote. Read the book & good luck!! tvman

When you turn it in, do you get an image? And if it is the LCD screen ( not the front protected glass) then yeah you might as well junk the TV. The cost for a replacement LCD screen exceed the cost of the unit. Sorry about the bad news, just being honest. Turn the television, if the LCD is cracked, then you will see it right away when the television is turned on.

I ordered a Sanus VMB1 kit for the some problem and I believe it should fix it for mine.

When problems arise that kill both video and audio, it is normally related to the failure of the main power supply.
Nearly all modern electronics uses a 'switched mode power supply.'
They are more efficient while being much more complex and prone to failure but offer the added benefit of being designed so a 'downstream' fault will cause the supply to shut down to avoid setting fire to your home.
The supply itself will also cycle if it has an internal problem; once again, to prevent destroying itself or anything dependent on its outputs.
 
Supplies built a couple decades ago could only do this by blowing a fuse and there are conditions that can occur that would not blow the fuse but would allow overheating and further damage as well as fire.

You might try the following: Pull the AC plug from the wall and ignore the set for a day or overnight, then plug it back in.
There are literally millions of semiconductors in a modern TV receiver and sometimes, they trip and lock themselves up.
When that happens, removing all power from the unit will allow everything to return to a stable state and function as designed again.

If that doesn't help, I hope your set is still under warranty as this could be a multiple hundreds of dollars to repair.
The power supply is often on a separate board and unfortunately, component-level technicians aren't that common anymore so frequently, the board is replaced and the old one discarded.

The best place to get LG parts is here:http://www.lg.com/us/support/parts-accessories

> IF IT WASNT DIGITAL HD I WOULD HAVE SUSPECTED HIGH VOLTAGE POWER SUPPLY BUT THAT DOES NOT EXIST HERE.
Well, not completely true; the fluorescent backlight is still a high voltage device, even if only hundreds of volts instead of kilovolts, and either the lamp(s) or the power supply for it (them) is causing the dropout of your picture. When it does it next time, look at the screen from various angles, I think you will see that video content is still there.  

Most Polaroid flat-screen TVs won't program to the Uverse remotes. Try buying a different universal remote that shows coding for both Uverse and Polaroid.

1. you should have a HD source, such as direct tv with HD channels
2. You need to connect this source with a HDMI cable
3. Make sure all the setting match from the source to the tv

I am having the same problem, is there any solution for this problem?

got to go through your settings and set it to 1080 p if it did not come pre set to that setting..it should have....

This set should still be under warranty. Inquire about warranty service. DO NOT open it up as that would void the warranty. There is a problem with either the logic board or the panel itself. In either case, it will be covered under warranty.
Dan