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Samsung 40" led tv no picture, no backlights. how can I tell if its the lights that are bad or the power supply/led board?

My 40" Samsung tv has no picture. I did the flashlight test and can see a faint picture where I shine the light. Audio is fine. Just no picture. Model # UN40EH5300FXZA

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Count the error code flashes on the standby light.

Posted on Mar 04, 2017

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Hi trying to figure out the ccause of samsung 40" tv blacking out model no LN4oc61on1f Turns on shows source or whatever then goes to black back lights come on flashlight test shows an image visual...


There is something wrong with your high voltage LED backlight power supply most likely, possibly a bad capacitor. See if you can identify the part number for the entire backlight assembly power supply and replace it.

Nov 02, 2017 | Samsung Televison & Video

1 Answer

I have a Samsung TV with sound but no picture.


Hi James,

If you can see the faint picture in flash light means the power supply and the main board is working. The real culprit is the backlight. Even one bad LED in the backlight will switch off the whole array. To repair this fault the panel has to be opened and the defective LED or LEDs are to be replaced.

This is a complicated, delicate and risky job and must be attempted by an expert only. You may end up damaging the screen permanently if you have not done it before and try to DIY.

Good Luck.

Oct 19, 2017 | Samsung Televison & Video

1 Answer

Samsung TV (model UN40H6203AF) 40" LED. No picture, have sound. Flashlight test can see faint menu screen. Have replaced power supply & main boards to this point. Ideas as to what to do next?


Hi Terry,

If you can see the faint picture in flash light means the power supply and the main board is working. The real culprit is the backlight. Even one bad LED in the backlight will switch off the whole array. To repair this fault the panel has to be opened and the defective LED or LEDs are to be replaced.

This is a complicated, delicate and risky job and must be attempted by an expert only. You may end up damaging the screen permanently if you have not done it before and try to DIY.

Oct 13, 2017 | Samsung Televison & Video

2 Answers

I have a 32" Samsung LED TV with not picture. Audio is working.


Do flashlight test - if you can see image you need t con board. If no images seen, inverter board. TV Parts Universal TV Stands DLP Chips ShopJimmy

Sep 18, 2017 | Samsung Televison & Video

2 Answers

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

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

4 Answers

How do I fix my Samsung 40 LED TV that has sound but no picture?


When repairing LED TV Back light assembly you need to contact expert person because lifting of LCD TV panel is very dangerous for non technical person. Be careful

37173103-9860-4e74-ba0c-e24133de2091.jpg

Oct 15, 2015 | Samsung 40" 1080p 120Hz Slim LED Smart TV...

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...


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

Feb 16, 2015 | LG 50 Inch LED TV 50LN5200 LN5200 Series...

1 Answer

Samsung monitor 2232bw plus backlight fade in black backgrounds scenes


Most common failures in these LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply C242 470uF 10V, C241 & C242 1000uF 16V, C261 & C319 680uF 35V failed as indicated in the attached picture, replace them at once.

If the power supply board is working then it is back light problem, first do a flash light test. If you can see the image in the flash light test, follow the steps how to test back light voltages: https://how-to-repair.org/repair/lg-tv-repair-manual-pdf/lg-led-tv-no-backlights-32ln5300-32ln5310-32ln5700-voltage-test-troub/2pyuXwNkBMA.html and follow the steps how to repair back light LEDs: https://www.youtube.com/watch?v=_poWTEihIJU Fix Led Backlights for TV or Monitor Lg Led Tv No Backlights 32ln5300 32ln5310 32ln5700 Voltage Test Troub Lg... Fix Led Backlights for TV or Monitor
samsung-2033sw-2233sw-ip-43135a-bn4400124s-power-board-dfydxumns33ohqc3bsmt22yf-3-0.jpg

Nov 07, 2013 | Samsung SyncMaster 2233BW 22" LCD Monitor

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