20 Most Recent LG 42LC3R 42 in. LCD TV Questions & Answers

Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.

LG 42LC3R 42 in.... | Answered on Aug 15, 2014

the LCD screen has a light source (like a monitor). It can be an lamp (like a projector TV), a mercury tube (like a monitor) or a LED-based lamp (so-called LED TVs have that, not to be mistaken for OLED TVs, where each pixel is a LED). I don't believe this model is an OLED. It could be one of the others, most likely a mercury lamp that lays at one side of the monitor and illuminates the screen.
You could shile a flashlight to the screen (from close distance) while the TV is powered on and see if any image is being formed on the LCD. If it does, the lamp is burned out and needs replacing. If no ghostly image is seen, then it could be the video processor and then it's a bigger problem.

LG 42LC3R 42 in.... | Answered on Apr 09, 2014

LG Zenith recommends replacing the Y-sustain, x-sustain and digital /logic board as a set. After you replace you will need to check the voltages listed on your panel. The cost if bought from second hand dealer like shopjimmy.com will be around 250-300 for the parts.
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LG 42LC3R 42 in.... | Answered on Feb 21, 2011

you have a screen sepration failure you will need a new panel big buck

LG 42LC3R 42 in.... | Answered on Nov 19, 2009

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 on Nov 27, 2020

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


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.


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 ?


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.


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

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