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I have a Samsung un32eh5300fxw with a non-working backlight. I'm unsure on this model has the LED backlight driver is built into the power supply, mainboard, or the t-con board.

I've performed a flashlight test and can confirm that the image is showing up on the screen but the backlights won't kick on.

Posted by Jeremiah Nichols on

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Sometime Mechanic

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  • 122 Answers

Take off the rear and check the high voltage circuit. 120 volts enters follows by a fuse into a small high voltage transformer, then on the other side a capacitor (100 uf rated 450 volts). Check the DC voltage here. I got 380 volts. Should be at least 390 volts or more. If anything less, you will need to replace this capacitor. I used two capacitors from some old power supply - 150 uf and 220 uf rated at only 400 volts connected them in parallel and TV is back to normal.

Posted on Jan 12, 2018

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4 Related Answers

Lawrence Oravetz

  • 10548 Answers

SOURCE: Samsung TV

If you see a picture with the flashlight you can rule out the T-Con board. It's working. So the led driver board is the problem. TV Parts Universal TV Stands DLP Chips ShopJimmy Go here for replacement parts.

Posted on Aug 07, 2016

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The Knight

  • 76584 Answers

SOURCE: LG 50la6970 no backlight i have sound and dark images!

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 08, 2016

Larry

  • 2812 Answers

SOURCE: LG 47LN5750 No picture

If you have backlights its not going to be the tcon for future reference. you have some shorted or open LEDs in the panel. Check the voltage going to the LED sets, should be 100 plus volts

Posted on Nov 16, 2017

Larry

  • 2812 Answers

SOURCE: Panasonic TC-L55DT50 has no backlight. How to proceed?

You have some bad LED lamps in the panel, its not a fun job to get at them and change them but if you watch a couple vids it should give you an idea how to do it, other issue is cost as the light strips can be expensive depending on the set and its size...Good luck!!

Posted on Dec 11, 2017

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1 Answer

Can you help me troubleshoot my TV? It has audio but no picture.


Use a voltmeter to confirm all the voltages are present when the TV is powered on. If they are all correct then replace the led driver.

Jan 13, 2018 | Samsung Televison & Video

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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.

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1 Answer

I have a Samsung 32" LED tv model number UN32F5500FXZA. It has sound but no picture but passes the flash light test. I don't see any backlights. Any idea what the part is?


The backlights are located around the edge of screen inside the tv. Now this model is know to have LED failures. The LED strips are you backlights. The LED strips are powered by the power supply board but due to the fact that this model is know to have LED failures, I would recommend replacement of the LED strips, all of them, first. Samsung BN96 25300A Replacement LED Strips UN32F5000AF UN32F6300AF
This website currently doen't have the parts in stock for your tv however this will help you identify the parts and they even have some tutorials.

If you need further help, reach me via phone at https://www.6ya.com/expert/steven_a67ead41eb5fc62a

Feb 04, 2017 | Samsung Televison & Video

1 Answer

I have a Samsung 40" LED tv that has sound but no picture. You can see an image if you shine a flashlight on the screen. I see no backlights when I take off the back.


Hi!

Check the backlight circuit, but first, check the power supply of the blacklight circuit, does it feed the backlight circuit or not. If not, it's the power supply circuit, if yes, check the backlight circuit itself, and if it works, check the backlight themselves, the led. Good luck,


Serge.

Nov 01, 2016 | Samsung Televison & Video

1 Answer

Samsung TV


If you see a picture with the flashlight you can rule out the T-Con board. It's working. So the led driver board is the problem. TV Parts Universal TV Stands DLP Chips ShopJimmy Go here for replacement parts.

Aug 07, 2016 | Samsung Televison & Video

2 Answers

Bn44-00666a led voltages


If you wish to get some details; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/

Apr 12, 2016 | Samsung Televison & Video

1 Answer

Samsung LED tv UN32EH4050FXZA No Backlight


Check ur led driver board and also a possible shortted led light

Dec 15, 2015 | Samsung UN32EH4050 32" LED TV 1366x768, 60...

1 Answer

Un32f5500AFXZA. Why does it have sound but no picture?


Yes. That is it. Replace it. Before replacing, check the input voltage to it from the main poser supply SMPS board. If the voltage is absent, there will be no back-light. 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/

Sep 01, 2015 | Samsung Televison & Video

1 Answer

47' (sic) LED TV, model number m470vse. Why doesn't the backlight work?


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/
In some models of LCD TVS; the backlight inverter and its T'Con board will be a part of the panel itself, and will be a built-in type inside the LCD panel. If so, they can't be replaced. In this case; a panel replacement is the only repair. For some other models, the backlight inverter section circuit will be a part of the main power supply regulator [SMPS]. To such sets, the power supply section circuit too should trouble shoot. Contact any service technician. The circuit will differ with models and versions.

May 29, 2015 | Vizio Televison & Video

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