Question about LG 50 Inch LED TV 50LN5200 LN5200 Series HDTV

2 Answers

LG 50ln5200-ub led TV . Has no picture but great sound . What is the problem ? I did the flashlight test and can see the faint picture which tells me the backlighting is out . This tv model is a Black friday " Wally World Craptastic " model built with the finest parts from the dumpsters at lg so it does not have a seperate inverter board , The inverter is built into the power board. I replaced the power board and still has the exact same symptoms . Any Help is appreciated/ The only other two boards are the t-con board and the main board . Power board has been replaced.

Posted by on


2 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that got 5 achievements.

    New Friend:

    An expert that has 1 follower.


    An expert who has answered 20 questions.

  • Contributor
  • 56 Answers

Usually bad power supply, Where did you source your part? return/exchange it. Bad LEDs/ possible but not as likely, Tcon working if you can see images with flashlight. You must also have backlight on signal from main board ,check for 3 to 5v on labeled connecter on power supply. UPDATE---47" & 50" LN series. This model has had LED problems if your TV acts as described by Mr. Hughes in is answer to this problem you have bad LEDs

Posted on Mar 22, 2015

  • Level 1:

    An expert who has achieved level 1.

    New Friend:

    An expert that has 1 follower.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 9 Answers

Can you see the the screen flash brightly when tv is first switched on and then immediately go black?Does the red led standby light then slowly flash twice? If these are the symptoms then I can only tell you that this is the fault I had on my LG .47ln540v tv.I replaced the main board,psu board and t-con board all to no avail.Finally i stripped down the screen assembly and found the problem was caused by a faulty backlight led. Apparently the electronic circuitry monitors the supply to the backlight leds and if it detects a problem it shuts off the supply and goes into a "safe"mode to protect the remaining leds from receiving to much current.One my tv I can only deduce that standby led light flashing twice is a blink code for a faulty backlight,but I could be wrong. Although I am not a tv technician I know enough about electricity to safely work on some repairs,but I cannot recommend others to do the same,there are some capacitors on the psu board carrying high current and charge and could be lethal even when power is disconnected from the tv.I managed to get a replacement led backlight strip from a damaged tv of the same model.It took me about 5 weeks to troubleshoot this fault.Hope this helps someone.

Posted on Mar 19, 2015


2 Suggested Answers



Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


The Knight

  • 76237 Answers

SOURCE: lg led tv backlight

Fault with its main 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. Surf the site with patience. Pull up older posts. . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Posted on Feb 05, 2015

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I have an Element FW408 no picture only sound

Do the flashlight test. With the TV on and listening to a program, shine a flashlight on the screen. If you can see a faint picture, the LED driver is bad. If you cannot see a faint picture, the T-con board is bad. TV Parts Universal TV Stands DLP Chips ShopJimmy You can get parts here.

Apr 30, 2018 | Element Televison & Video

1 Answer

My LG tv (Model number: 32LS3410-UB) has sound, but no picture. When I do the flashlight test I can see a very dark image on the screen. Will replacing the LED driver fix this problem?

If you already tested with the flashlight which is the first step in the blank screen with sound fault then you have to test the LED Backlight supply voltages if you are familiar and good in the electronic repair. First you have to check if bulging capacitors for the LED Backlight drive voltage circuit, replace them. If capacitors are good then you have check the backlight LEDs. The flashlight test proves that the power supply is good and TV is working fine because the sound is ok and picture is fine. Attached videos and links may help you for the repair and replacement of backlight LED strips or LEDs itself depending on the type of LED strips used in your model.

May 08, 2017 | LG Televison & Video

1 Answer

Lg tv power light comes on but screen stays blank

If you can't see a faint picture with the flashlight then the T-con board is gone. If you can see a faint picture, then the led driver or ballasts for the back lights quit. You can get parts from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

Dec 05, 2016 | LG Televison & Video

3 Answers

LED tv LG 50LN5200 with no picture but has sound

Faulty the backlight
It is necessary to remove the panel and replace defective LEDs

Best Regards!

Oct 31, 2016 | LG 50 Inch LED TV 50LN5200 LN5200 Series...

Not finding what you are looking for?
LG 50 Inch LED TV 50LN5200 LN5200 Series HDTV Logo

2,536 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Televison & Video Experts


Level 3 Expert

13434 Answers

The Knight
The Knight

Level 3 Expert

76237 Answers


Level 3 Expert

438 Answers

Are you a LG Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides