20 Most Recent LG 55" 5700 Series LED HDTV - 55LN5700 Questions & Answers


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://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.

LG 55" 5700... | Answered on Oct 27, 2016


Sounds like 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://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.

LG 55" 5700... | Answered on Aug 17, 2016


Depending on the model maybe. Tv's like all electronic items use multiple circuits that are interconnected. So if you have a problem like you described it can be any interconnected board. I experienced problems like you described many times. Use your eyes and nose. Turn off the power, remove all boards and visually inspect. While boards are out sniff each board. Look on both sides of each board. If nothing is found I would start with the power supply and replace it. You can check the output voltage where the power supply connects the the main board. It is harder to check the main board function because the signals pulsing thru the main board require specialized equipment.

LG Televison &... | Answered 2 days ago


The power supply could be failing.

LG Televison &... | Answered on Nov 12, 2020


1. Open internal fuse
2. Power supply failure

LG Televison &... | Answered on Nov 11, 2020


That is the right amount of voltage the issue is when one or more of the individual LED lights fail, the current changes and the power supply senses it and shuts down.

LG Televison &... | Answered on Nov 05, 2020


You could use headphone plug with adapter for audio out. For more hdmi ports you can buy hdmi switch. Svc port is for service.

LG Televison &... | Answered on Oct 29, 2020


Use code search on your Audiosonic URC to find something that works. If a search through all codes stored in the URC fails, try a different one.

LG Televison &... | Answered on Oct 29, 2020


You lucky it worked that long. For some units die within first few months

LG Televison &... | Answered on Oct 29, 2020

Tip

Repairing your own Television


Every day we see this type of post regarding self television repair. This explains why you can't diagnose television problems on an online forum. The television sections are really only for help with manuals, wall mounts and remote codes.

Here are similar questions that we see often.

Question:

I've replaced everything in my television because it previously had a black screen with no lighting. Now it doesn't turn on at all and all I have is audio. What could be the cause ?

Or

Turns on and sound works fine, but the picture is distorted (solarized? polarized? not sure what the term is) I replaced the main board, but that didn't fix it.


Or

I have an LG 55LM6200-UE with a dim lower-left. I just replaced both LED strips with no resolution. There is no physical obstruction visible, so this has to be a cable or board problem, right?


So your television stops working properly and you think it must be easy to fix, because you can buy boards on eBay, and you can watch YouTube videos. So you make a decision, you buy a board and you fit it, but the television still doesn't work as it should! This is a classic case of the 'let's try replacing this' method of television repair and illustrates why it is a bad idea. It doesn't work for a number of reasons.

To correctly diagnose issues, you need to know every board, what it does and every component on the board and what they do. You need to know which part has failed, replace the failed component, or replace the board. The parts you purchased off eBay were probably out of scrapped sets and not tested. The part you put in was dead when you put it in, so you just moved on to another guess at what might be the cause and replace a board that is fine. And so it goes on, you change all the boards and it still doesn't work because your first replaced board was a dud. Did you notice the large print that says 'NO Refunds, NO Returns'. This is to stop you sending your old one back and saying it didn't work, but the unscrupulous sellers use it as an excuse to get money for selling items that may, or may not work! The course to be a television engineer is 2 years full time education, and they own thousands of dollars of test equipment. Take it to someone that knows how to diagnose and fix. It is by far the cheapest option. The part that failed might be a 20 cents fuse diode hard soldered to a board. They will charge you $5 in parts and a couple of hours labour. It's not the fix you want to hear, but it really is the best advice.

Andrew - Fixya Moderator - Expert

on Oct 18, 2020 | Televison & Video


Locate the inverter board inside the bottom edge of the LCD panel just below the LCD screen. Turn on your Multimeter device and enable "DC Mode" on the Multimeter. Attach the positive (red) probe to Pin 1 on the inverter board. There are two power cables connected to each end of the inverter board.

LG Televison &... | Answered on Sep 23, 2020


Asad shaukat Ali

LG Televison &... | Answered on Sep 20, 2020


When ONE led on the strip fails, the amount of current being sent through the strip changes. It can cause the unit to sense the change in current and shut down. You can replace all the strips or you can use a meter to check the diodes and see how many failed and then replace those individually or the whole strip they are in

LG Televison &... | Answered on Sep 16, 2020

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