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Hi, I have a samsung un65ku6290 and am noticing dark spots all over the screen.

Recently, the picture was flashing blank but has stopped. Now I'm noticing dark spots all over the screen. I opened it up and all led backlights are functioning properly, diffuser panels are very clean and I don't see any physical issues. Could my panel be bad? or is it possible that the main board is the issue? Thanks

Posted by Nick Costa on

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5 Related Answers

budmrtn

Bud Martin

  • 11361 Answers

SOURCE: Screen goes blank randomly during use while VGA

Yes, it can be inverter back lights circuits issue or bad caps in the power supply, worst case will be the lamps. Open it up and post back what you see inside so we can guide you further, see failed monitrs due to bad caps: http://s807.photobucket.com/home/budm/allalbums

Posted on Feb 22, 2010

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Kristoffer Martin

  • 293 Answers

SOURCE: Samsung led TV un60es8000 dark blotchy area on the upper right of screen. Most noticeable on greys,blues and blacks. The picture attached is the color most responsive to this issue (dark grey). Light

This is caused by one of two things; a bad LED grouping (most common cause) either because the LEDs are bad or the power distributor fuse is blown and the group isn't getting power from the power supply unit. Or two: bad pixel group. But I'd check your backlight power supply for bad connections, blown fuses, or check your led groups for bad leds.

Posted on Jan 28, 2015

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gopakumarg43

The Knight

  • 76396 Answers

SOURCE: Samsung led tv - turns on,audio ok, no video, backlight on

Sounds like T'Con board fault. Check and replace it. 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/

Posted on Oct 31, 2015

Testimonial: "I have already replaced T-con board. here is what happens. initial tv had blank screen , with audio. and back light on. so I ordered T-con board and replaced it but now with new T-con board connected backlight is flickering like a strobe light. and I have tried with 2 different lvds cables. same result of flickering."

Jay Plesset

  • 2942 Answers

SOURCE: power supply or main board ? RCA flat screen

At a guess, main board. I agree if power supply board is bad, you won't get DVD working.

Posted on Dec 31, 2015

gopakumarg43

The Knight

  • 76396 Answers

SOURCE: I have the oCosmo CE4001. No picture. Just audio. No backlights. I can see a picture when I hold a flashlight up to the screen. Is this the LED driver gone bad? Is that part of the main power supply?

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.

Posted on Oct 20, 2016

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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.
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https://www.youtube.com/watch?v=YgaL6X6eSaU
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Diagnosing a LCD blank screen problem.


Recently a 3 year old VIzio TV I bought started having problems. The set would turn on normally for a few seconds then the picture would go dark with everything else operating normally including sound. Remembering a similar laptop computer problem I diagnosed previously, I immediately suspected a defective TV screen backlight. To verify this in your own TV, get a very bright flashlight and with the TV operating in the failed blank screen mode, shine the flash light into the blank screen from various angles and distance (including touching the screen). If the LCD is still operating, you'll see a dim motion in the flashlight's reflection, thus proving it is indeed a failed backlight.

on Jan 27, 2015 | Televison & Video

1 Answer

Samsung led TV un60es8000 dark blotchy area on the upper right of screen. Most noticeable on greys,blues and blacks. The picture attached is the color most responsive to this issue (dark grey). Lighter...


This is caused by one of two things; a bad LED grouping (most common cause) either because the LEDs are bad or the power distributor fuse is blown and the group isn't getting power from the power supply unit. Or two: bad pixel group. But I'd check your backlight power supply for bad connections, blown fuses, or check your led groups for bad leds.

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Try reseating the video cable/connector that connects to the motherboard first.
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Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
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You could have a defective LCD screen, If the laptop appears to be booting up and running and the hard disk is spinning and the hard disk LED light is flashing but the screen is dark then, to determine if you have a LCD screen or video card problem, read this and follow these instructions.
Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
Connect an external monitor to your laptop and power the monitor up first then the laptop, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight. Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net
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1 Answer

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You could have a defective LCD screen, If the laptop appears to be booting up and running and the hard disk is spinning and the hard disk LED light is flashing but the screen is dark then, to determine if you have a LCD screen or video card problem, read this and follow these instructions.
Defective CCFL backlight, it may have the following symptom: Screen flashs on red/pink and off. Picture stays on in red and slowly be come normal. Picture flickering with dim display or appear black. Picture flickering on and off. All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp.
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The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out
www.lcdparts.net
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Defective CCFL backlight may has the following symptom:
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  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp)
has reached the end of the life and all you need to do is replacing the CCFL lamp.

Go to www.lcdparts.net for parts detail and installation

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