LG TV Won't Turn on? This Is How I Fixed Mine.

Updated on January 31, 2019
LG 42LN5300 LED TV
LG 42LN5300 LED TV

LED TV's have a known problem with capacitors going bad. If your LG LED TV won't turn on, or makes repeated clicking sounds, there is a very good chance that you can save hundreds of dollars doing this simple repair yourself.

I know, I know. You're thinking, "Tinker inside my LED HDTV. Are you crazy?" No, I'm not crazy. This is a repair almost anyone can do, it's actually quite simple, and with only a few basic tools and about 20 bucks, you can have your TV working in less than an hour.

The step-by-step repair below was done on a LG 42LN5300 LED HDTV, but this easily repairable solution can be performed on any Flat Screen TV.

But I don't have a LG TV!

Don't worry. The steps below will help you repair any brand of TV.

Tools Needed

Required Tools
Required Tools

You will need the 5 items below for this repair:

  1. Phillips Screwdriver
  2. Pliers
  3. Wire Cutters
  4. Soldering Iron
  5. Capacitors (You'll get these after identifying bad capacitors in Step 5)

Need a soldering iron? No problem. They are cheap and easy to use.

I highly recommend the J&L 60 Watts Soldering Iron. It's about 20 bucks, or if you're looking for the lowest price possible, this 60W soldering iron with stand is about $8 (shipped prime) and will work just fine.

Optional Tools

Optional Tools
Optional Tools

These tools aren't required, but they can make the process easier.

  1. Magnetic, ratcheting, flexible screwdriver (to help remove all the casing screws)
  2. Cordless Screwdriver (to help remove all the casing screws)
  3. Desoldering wick (absorbs melted solder)
  4. Solder sucker (remove melted solder)
  5. Flux Pen (flux on solder makes it flow and less "sticky")
  6. Multi-Meter (test for bad Caps, helpful if there are no visual clues)


Step 1: Remove the Stand

After unplugging everything on the TV, you will need to remove the stand. If your TV was wall mounted you will need to remove the TV from the wall, and remove the mounting bracket from the back of the TV.

Red arrows: Remove these 4 screws to remove stand from TV.

Blue arrows: Remove these 4 screws to remove a wall mount (not shown) from your TV.

The TV sits on top and inside the stand, so it wont just flop over when you remove the stand screws, but it's always safer to have a friend hold the TV upright as you remove the screws from the stand. Then each of you grab a side and carefully lay it flat on a carpeted surface.

Step 2: Remove The Back Casing

There are 16 screws to remove that will allow the back casing of the TV to come off. Remove all of the screws shown at the "yellow arrows" below.

Removing all of these screws is made much simpler using a cordless or ratcheting screwdriver.

Warning:

When handling your TV always keep it straight up (like your watching it) or laid flat. Any force applied at odd angles can damage the fragile glass front.

Step 3: Remove Power Board

With the back casing removed locate the power board (pictured below).

  • Take a picture of the board (will help during re-assembly)
  • Remove all power harnesses using a simple tug on the connector clip (not the wiring)
  • Remove all screws holding board down


LG TV Power Board

LG 42LN5300 LED TV Power Board
LG 42LN5300 LED TV Power Board

If you're not working on the LG 42LN5300, your power board will look different, but the process is the same.

Step 4: Learning how to Identify Bad Capacitors

Usually, but not always, capacitors will show visible signs of failure. There are two main types of visible failure.

Bulging Vents:

When it fails, the chemical reaction inside the capacitor can produce hydrogen gas, so capacitors have vents cut into the tops of their aluminum cans. These are intended to break and release the gas that has built up inside the capacitor. So, a capacitor which has failed can show bulging at the top. Below is an example.

Leaking:

Another sign of a failed capacitor is leaking fluid (electrolyte). This can be an orange or brownish discharge from either the top or bottom of the capacitor. Usually a leaking capacitor will also be bulging. But not all bulging capacitors are leaking.

We want to emphasize that capacitors do not always show visible signs of failure. But if you see signs of this on your board, you can be confident that you're close to fixing your TV. If you don't see these signs of failure, but your TV had the tell-tail clicking sound, you still can be fairly certain the steps below will fix your TV

Step 5: Find Bad Capacitors on Your Board

On the LG LED TV power board pictured above, I have indicated which capacitors you should be examining for signs of failure. The Capacitors are Aluminum Electrolytic Capacitors, and are the most likely cause of your problem.

Don't worry if your board looks a little different. Simply examine all Aluminum Electrolytic Capacitors and usually the faulty one(s) stand out.

Note: Do not bother with the large capacitors (2 or 3 will be on every board). These are high voltage, rarely fail and for safety require a little more expertise to work on.

Leave these Alone

Step 6: Removing Capacitors

Tip:

Take a picture (or several pictures) of your board. Use them to verify re-assembly

Capacitors have polarity. What this means is, like a battery, they have a positive (+) and a negative (-) side. Before removing any capacitor, note which side the white stripe of the capacitor is facing. You will need to put in the new capacitor in the same direction. Takes Notes or Take a picture, or you will ruin your TV.

Now that you've identified the capacitors that look bad, turn the board over and carefully identify exactly which points on the board are from these capacitors. Circle them with a "sharpie" type pen to keep track.

Grab your friend and have them help you on this next step. Balancing the circuit board on its side while using a hot soldering iron and pliers can be a bit tricky.

Plug in the soldering iron and give it 10 minutes to get hot.

With the circuit board on its edge, have your friend grab one of the capacitors with the pliers and apply a very gentle pulling pressure. Apply the tip of the soldering iron to one lead on the back side of the board and hold it there until you see the solder melt. Now switch to the other lead until it melts. Keep going back and forth on the leads. Each time the solder will melt faster. After going back and forth a couple times the capacitor will easily come out.

Repeat for each capacitor that you are replacing.

Tip:

Use desoldering wick or a solder sucker to remove solder from a capacitor lead.

Let the Soldering iron do the work. If the capacitor does not easily pull out, do not force it.

Step 7: Time to go Shopping

Having found and removed the bad capacitors on your board it's time to buy new ones.

Capacitors are rated for their application and you must replace like for like. There are 3 ratings to identify:

1. uF (micro farads)

2. Temperature

3. Voltage

uF (micro farads)

Ideally you should match the uF and the temperature rating exactly. But it is acceptable to use a capacitor rated higher uF if it is within 20% of the original.

Temperature

Match the temperature rating, but you can go higher if needed. Not Lower!

Voltage

Match if Possible. You can use a larger value if needed. Not Lower!

Where to buy

Often you can find replacements capacitors at your local electronic store. But it may be easier to buy replacements from Amazon.com.


Tip:

If your replacement capacitors don't match exactly what was removed, write the original values on the circuit board with a sharpie. If you ever have to replace them again you want to try and match the original values.

Step 8: Install new Capacitors

Insert capacitor, making sure to place the negative side in the correct location (look at your notes or pictures and confirm). If there is hard solder in the hole, simply apply the soldering iron until solder melts and slip capacitor leads in.

Bend back the leads to hold the capacitor in place.

Carefully clip the leads so that only about 1/8" is protruding.

Place your soldering iron and solder on lead until the heat melts the solder. Once solder melts onto the lead, apply the iron on the lead and solder a few times to melt the solder cleanly on the lead. If you have solder flux, the solder will make a clean connection.

Once the Capacitors are installed clean any flux or solder residue with a damp cloth.

Step 9: Reverse the Process

1. Attached the circuit board.

2. Reattach all wiring harnesses.

3. Replace the back cover.

4. Turn on TV and be happy that you save yourself a ton of money.

Congratulations!

This fix works. It worked for me, and it worked for hundreds of people reading this and my other articles.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

    © 2019 Discoverinfo

    Comments

      0 of 8192 characters used
      Post Comment

      No comments yet.

      working

      This website uses cookies

      As a user in the EEA, your approval is needed on a few things. To provide a better website experience, turbofuture.com uses cookies (and other similar technologies) and may collect, process, and share personal data. Please choose which areas of our service you consent to our doing so.

      For more information on managing or withdrawing consents and how we handle data, visit our Privacy Policy at: https://turbofuture.com/privacy-policy#gdpr

      Show Details
      Necessary
      HubPages Device IDThis is used to identify particular browsers or devices when the access the service, and is used for security reasons.
      LoginThis is necessary to sign in to the HubPages Service.
      Google RecaptchaThis is used to prevent bots and spam. (Privacy Policy)
      AkismetThis is used to detect comment spam. (Privacy Policy)
      HubPages Google AnalyticsThis is used to provide data on traffic to our website, all personally identifyable data is anonymized. (Privacy Policy)
      HubPages Traffic PixelThis is used to collect data on traffic to articles and other pages on our site. Unless you are signed in to a HubPages account, all personally identifiable information is anonymized.
      Amazon Web ServicesThis is a cloud services platform that we used to host our service. (Privacy Policy)
      CloudflareThis is a cloud CDN service that we use to efficiently deliver files required for our service to operate such as javascript, cascading style sheets, images, and videos. (Privacy Policy)
      Google Hosted LibrariesJavascript software libraries such as jQuery are loaded at endpoints on the googleapis.com or gstatic.com domains, for performance and efficiency reasons. (Privacy Policy)
      Features
      Google Custom SearchThis is feature allows you to search the site. (Privacy Policy)
      Google MapsSome articles have Google Maps embedded in them. (Privacy Policy)
      Google ChartsThis is used to display charts and graphs on articles and the author center. (Privacy Policy)
      Google AdSense Host APIThis service allows you to sign up for or associate a Google AdSense account with HubPages, so that you can earn money from ads on your articles. No data is shared unless you engage with this feature. (Privacy Policy)
      Google YouTubeSome articles have YouTube videos embedded in them. (Privacy Policy)
      VimeoSome articles have Vimeo videos embedded in them. (Privacy Policy)
      PaypalThis is used for a registered author who enrolls in the HubPages Earnings program and requests to be paid via PayPal. No data is shared with Paypal unless you engage with this feature. (Privacy Policy)
      Facebook LoginYou can use this to streamline signing up for, or signing in to your Hubpages account. No data is shared with Facebook unless you engage with this feature. (Privacy Policy)
      MavenThis supports the Maven widget and search functionality. (Privacy Policy)
      Marketing
      Google AdSenseThis is an ad network. (Privacy Policy)
      Google DoubleClickGoogle provides ad serving technology and runs an ad network. (Privacy Policy)
      Index ExchangeThis is an ad network. (Privacy Policy)
      SovrnThis is an ad network. (Privacy Policy)
      Facebook AdsThis is an ad network. (Privacy Policy)
      Amazon Unified Ad MarketplaceThis is an ad network. (Privacy Policy)
      AppNexusThis is an ad network. (Privacy Policy)
      OpenxThis is an ad network. (Privacy Policy)
      Rubicon ProjectThis is an ad network. (Privacy Policy)
      TripleLiftThis is an ad network. (Privacy Policy)
      Say MediaWe partner with Say Media to deliver ad campaigns on our sites. (Privacy Policy)
      Remarketing PixelsWe may use remarketing pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to advertise the HubPages Service to people that have visited our sites.
      Conversion Tracking PixelsWe may use conversion tracking pixels from advertising networks such as Google AdWords, Bing Ads, and Facebook in order to identify when an advertisement has successfully resulted in the desired action, such as signing up for the HubPages Service or publishing an article on the HubPages Service.
      Statistics
      Author Google AnalyticsThis is used to provide traffic data and reports to the authors of articles on the HubPages Service. (Privacy Policy)
      ComscoreComScore is a media measurement and analytics company providing marketing data and analytics to enterprises, media and advertising agencies, and publishers. Non-consent will result in ComScore only processing obfuscated personal data. (Privacy Policy)
      Amazon Tracking PixelSome articles display amazon products as part of the Amazon Affiliate program, this pixel provides traffic statistics for those products (Privacy Policy)