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Determining if an LED TV screen is defective. (SCREEN DARK)

LG MODEL 39LP620H-UH. HAS SOUND, MAIN BOARD AND POWER SUPPLY BOARDS OK. 220V GOING ON THE TWO LEADS TO THE FLAT PANEL. IT HAS TO BE EITHER THE SCREEN OR THE TFT MODULE?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Tech4lfe
  • 38 Answers

SOURCE: Westinghouse LTV-32w6 power light on, no video, no sound

One thing is to make sure the inverter board is unplugged when testing the voltages. A shorted inverter will shut down the power supply if the fuse dosen't blow first. There are fuses that don't look like fuses so they can be missed. The next thing would be to look for a connector from the main to power supply and see if there is a pin labeled power on or p.on or similar. The main board should turn this line high(5V) when you push the power button. If not you probably have a bad main board. Unless you can find good used boards they are both expensive. Around $200 for PS and $300 for main.

Posted on Jul 06, 2008

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  • 1 Answer

SOURCE: lg w2234 don't turn on even if the power supply go 18v and 5v.

My dear friend,
I've the same problem and I try solution on the numerous sites of company that project this module

Posted on Dec 07, 2009

  • 25 Answers

SOURCE: PLASMA TV PROBLEM

The problem with this set, is defective YSUS board, to avoid future same problem, you must change the following boards: YSUS, ZSUS & Control.
Verify with LG if your serial Number is included within
lots production that were recalled by this design defect

Posted on May 28, 2010

Testimonial: "I'll try to contact LG dealers. Very hank you sir"

eagle338
  • 4889 Answers

SOURCE: Visio p42hd, no picture

Yes it does sound like the mainboard. But we have to confirm. I will see if there is a service manual for this unit in my collection but do you think you can safely work on it? Have you worked on electronics before? The last thing I want is you hurting yourself trying to fix it. HV circuits are not to be messed with unless you know about them.

Posted on Nov 03, 2010

  • 1 Answer

SOURCE: I have a SANYO DP46848,

Ray I have just about the same issue . But my only problem is the thin black lines. Do you think cleaning the flex cables coming off the Tcon will help at all? This is the same model DP46848

Posted on Oct 02, 2012

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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

May 04, 2017 | Sanyo Televison & Video

2 Answers

Why does my TCL tv stay dimmed and very dark screen? I've reset it and everything?


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.

Apr 30, 2017 | Televison & Video

3 Answers

I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.


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.

Apr 26, 2017 | LG Televison & Video

1 Answer

LG model 47LN5700-UH LED TV. There is a single thin vertical line on the screen. I have changed the LED/Power Supply board and LED strips. What might be causing the vertical line?


You have wasted your time and money. The LED power supply and LED strips are only the backlighting. The only thing that might fix is a situation where you have a blank screen with the sound working.

If you don't know what you're doing, DON'T OPEN THE TV UP TO FIX IT, THERE ARE HAZARDOUS VOLTAGES ON THE POWER SUPPLY BOARD, EVEN WEEKS AFTER THE TV IS UNPLUGGED!

If you don't know how to do it yourself, find some local Electronic repair shops, get quotes, try to find reviews on the shops.

Nov 26, 2016 | LG Televison & Video

1 Answer

18 month old LG 43" LED TV. Screen goes dark, but can be seen if you hold a flashlight up to screen. Sound is fine.


The inverter supplies the voltage to activate the screen. There are usually 2 boards, a slave and a main board. Sounds like one of them is leaking voltage and causing the screen to go dark after the initial start up. Make sure you didn't joggle something loose while you were replacing the power board check all connections. GL

Aug 26, 2016 | LG Televison & Video

2 Answers

Samsung UN55EH6000 has audio, but no backlight LED as seen with flashlight test.


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.

Feb 29, 2016 | Samsung Electronics UN55EH6000 - 55in...

2 Answers

I have a LG 47LN5750 that powers on, flashes a good picture for about 1/2 second, then goes dark. Still have sound & can see a picture with a flashlight shining on the screen.


Fault to the main power supply regulator section. Either it will be a separate board, or the part of main 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. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Oct 19, 2015 | LG 47LN5750 47" LED TV 1920x1080, 120 Hz,...

1 Answer

How Do I repair my LG LED TV that does not power on?


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/
You can repair it very easily, within seconds.

Sep 16, 2015 | LG Televison & Video

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