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

The common problem is the main board, instead to purchase a expensive main board, you may try to re-flow the soldering on the main board, it is the only way you may fix the main board at your home. Re-Flow Soldering Procedure for LG Main Board

1.Pre-heat your kitchen oven to 385 degree (No more than 400 degree); 2.Put the main board on a card board (like a pizza box board) in the oven; 3.Heat it for 10 minutes (No more than 10 minutes); 4.Turn the oven off & leave the door open, at this moment, do not touch or move the board until it colds down to the room temperature. 5.Install the board in the TV & try it out.

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/ To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/ Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.

No back-light. Check and replace damaged component/s at its backlight inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do a search by type in the brand name of your device at its search box. http://electronicshelponline.blogspot.com/

Check and replace damaged component/s at its backlight inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" or "Magazine" will make surf easy. Surf the site with patience. Pull up older posts. Do a search by type in the brand name of your device at its search box. It will be best to replace the inverter board as card basis. http://electronicshelponline.blogspot.com/

Make sure your not using spanish audio programming make sure its not muted depending on the tv some tvs have speaker off and the audio would pass through the rca out.. If your using equipment to view tv make sure your audio in is plugged in.. Change channels and see if you have audio than

The blinking of standby light indicates a fault in the internal circuit. From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit stage inside it. If you wish to get more details about these blinking codes, check this link. http://electronicshelponline.blogspot.com/ Pull up previous posts by its left sidebar, or type in the brand name and model number to of your set, to its search box, and press 'Enter' or view it in Mosaic / Timeslide option.

Two possibilities are there. The first one is, with loose LVDS cable, that connects the T'Con board to display panel. The second is the fault with its main digital processor board.http://electronicshelponline.blogspot.com/

Sounds like you have a bad power supply or possibly a power supply not rated for your tv or the display is just junk . Unplug it and leave it unplugged until you can get it fixed or looked at, POTENTIAL FIRE HAZARD!!!

The degaussing resistor inside it have opened. Replace it, and remove any speaker boxes near the TV.

They would have to purchase it from LG (brand indicated here) it will be on that board (some are on same board as buttons or separate board.like this without the metal frame in most cases--item in picture is under 1/2 inch tall.

the capacitors on the power board are getting weak and taking longer to charge up eventually the set will not power n. You can get the replacement capacitors or the replacement power supply from www.tvrepairworld.com

I would not even bother--the salt water has damaged all boards in the set and over time the set will have additional problems----kind of like a small car that has been in an accident , no matter how well it is repaired it will never be the same as before and will have continued issues related to the damage that happened.

The issue may be inside the display panel or very near it---try very gentle probe of cables with back off and set on----careful!

you will need a new main board, your set has several different variations. The cost of the replacement board can range from $100-$150 from reliable sources. If you decide to order a new board, you will need to find out the part # of your main board so that you are ordering the correct board.

I would suggest you contact LG even if the set is out of warranty there may be a software upgrade for this kind of issue or they may be by model number familiar with the problem.It is what I call a micro related problem-all sets have a micro processor and when you unplug the set it resets this circuit.

No you should not