Samsung TV mainboard and backlight test. See info section for additional info.
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Published 2022-06-16
In this video I demonstrate how many of the newer Samsung LED TVs will allow the back lights to come on if you unplug the cable going to the main board.
Since backlight and mainboard failures are fairly common, this test can be helpful in trying to figure out if your backlights are the cause of your problem, or the main board, Since a defective T-con board can also be the reason the TV goes into shut down it's also advisable to try unplugging the T-con board on the input side to see if that allows the backlight to come on.
If it does you can also unplug the output side of the T-CON board and see if the display is causing your TV to shut down.
This youtuber went into far more troubleshooting depth than I did in my video. It's worth watching. This youtuber covered other possibilities in greater depth than I did here. • Video to highlight the problem of rep...
All Comments (21)
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A code that technicians needs to have. Informing and advising the customer the best route for the situation, repair or just buy a new one. Great vid as usual
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Hey bro thanks, i was wondering how to just turn on the backlight without the screen to make a light for a room and ur vid really helped
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Great video, thanks! Do you know if the main board can be updated? Maybe mount one of the most modern ones with android Os?
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Great, i figured out with your help what samsung couldn't tell me ! i'll let you know if the fix worked.
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When my 15 year old 40 inch Toshiba stopped working in Feb this year, I had a realy hard time finding a replacement. The only TV's for sale have HDMI inputs and my PC only has VGA output. The temporary TV was a 19inch with composite input so I was using my VGA to comp converter that gave a horrible fuzzy picture, I could'nt read any text), which meant I could'nt look online for anything. The new 43 inch with VGA cost me £320. So I'm fixing the old one as a spare. :)
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Hello. Can you tell me how to test the display with a universal panel tester?Thanks.
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Hi ! Very interesting content and comments, thanks for your video. Do you know the usual voltage the backlight LEDs usually need on Samsungs (side LEDs, as well as backlight strips) ? I have a lot of spare parts (due to working with signage products) and yet this is a very difficult information to come by... As I am just a noob in electronics (yeah, you gotta start somewhere) I don't want to damage anything (nor myself) but would love to start tinkering with those powerful LEDs... Thanks in advance for your help !
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got a ue55h6470 with no sound coming out of it how should one diagnose that one? i've done the service mode test and it shows "sound main amp: NG"
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So i have the same issue. Now if i unplug the main oard and the backlights stay on and i plug the mainboard back into the power supply and disconnect the top ribbon and the backlight comes on and sound comes on, but no picture, would that be a ribbon or main oard issue?
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Hello, just a quick question if you can help me.. ue55ku6400: with all connected no boot - flashing backlight with led strip cable disconnected it boot with image (checked with light) do you think is led strip problem or power supply? thanks and sorry bad english
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Hello, I need to replace a Samsung BN94-12747R Main Board for UN50MU6070FXZA Version AB15. I cannot find that version. Would I be able to use Version AA16 since that is the only part I am finding? Thanks in advance.
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Im troubleshooting a Samsung 85" CY-SA085HGHV1H. The back lights were flashing off and on. After a few minutes the backlights came on but had dark areas. The media was working and I could see video. Unplugged the unit overnight and next morning no back lights. I can hear the tv samsung startup sound but no back lights. The Back light terminal has 380vdc output so I assume the back lights went bad overnight? Makes no sense. Does the neg side of the LED have a current control that may shut down the LED's? Any ideas?
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hi is it normal for samsung power supplies to turn on the leds on the screen when they are disconnected from the mainboard????
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What if the LED do not come on when unplugging the mainboard power cable? What could be the problem then? I'm currently trying to troubleshoot my Samsung tv
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Hello sir hope you can answer my question: I have the same tv with the same problem, i sent it to a shop for repair and when i checked they didn't repaired the problem but added a tape to bypass it. My question is: is the mainboard and the t-con in this tv the same? The image quality with the tape its not the best, i wanted to replace the T-con board to fix the problem but can't find it. Thanks in advance.
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my samsung - un65nu6900. Powers on and has a full picture but has a thick Dark tinted line just off to the right of Center..what could it be? Backlight?
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Hello, I have a 70” Samsung led tv that has colored vertical lines all the way across the top of the screen and the rest of the screen is black. Any ideas how I can fix this or is it even worth fixing? This tv was given to me and I can’t afford to buy a new one. Thank you
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Was tha backlight turning on and off and relay clicking?
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My issue is the backlights keep flashing/blinking every half a second...it just keeps flickering...i unplugged that same connection that you did from power board to main board and it does the exaxt same thing...how would i go about troubleshooting
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What is the average life expectancy of a new TV ?? Nice video fella.
