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Television will not turn on. Why does the red led sensor light appear to be giving a flashing code. The led will light up for approximately 3 to 4 seconds then go out for approximately 15 seconds and keep repeating this cycle? Tried different outlets, different cords, 60 seconds without power holding the power button and tv will not turn on.
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@chancez just to clarify all your power LED does is turn on, stays on for 3-4 sec then turns off. The same cycle repeats indefinitely?
It's a Samsung TV so there is a big benefit on those.
To see if your power supply (as well as your backlights ) work, do this. Disconnect the power supply cord. Remove the back cover. Disconnect the main board from the power board. Now plug the power supply cable into your TV. Your TV's backlight should turn on. You can see this through the multiple holes in the back of the sheet metal which covers your LCD screen.
If you have no backlights you will need a multimeter and measure the minus and Plus voltage pins on the main board connector. If there is no pin voltage then the issue is your power supply.
A backlight tester will only turn on the backlight array but it will not tell you if you have any LED's on the array that have failed. Your Samsung TV uses a current resistance circuit that will prevent your TV from coming on if there are any LED's that have failed. I use my backlight tester to check the array to identify which LED has failed when I have a panel disassembled. Or to verify that the backlight is just not turning on. Commonly, Samsung TV's will give you a 6 blink error code if it is the backlight.
IF you are unsure about any of this, just unplug your TV and remove the back cover. Then take some good pictures of the circuit boards and the interconnect ribbon cables. That way we can see what you see and provide further assistance with this.
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oldturkey03, I just have to let you know a few things. 1) I'm new to this forum. As a matter of fact the first time I saw this website was two days ago and I was reading some of the issues other people were facing. I came across some responses made by you and clicked on your profile. It truly amazed me. I have to let you know "much respect brother" from me to you.
2) I don't have much TV repair experience. Close to zero, but I'm technically inclined. Mechanical engineering, robotics technician, industrial repair technician.
3) I appreciate your response greatly. I am helping my wife who just had hip replacement so I most likely won't finish what you have instructed me to do until some time tomorrow. I will respond with my findings some time tomorrow. Thank you very much for sharing your knowledge. Very much appreciated 👍
Just an update. I couldn't wait to check out what you had instructed me to do oldturkey03. The LEDs do light up when main board is disconnected from power board and power is supplied.
@chancez no worries about anything on here. We all have to start somewhere and I myself fumble my way through some of my repairs. There is absolutely no rush and we do this in small digestible steps. If it gets to deep into the weeds we can always back up. Most repairs are not as easy as "replace c4567 and its done" As you probably know, there are always unknown components, no real schematics and a lot of challenges. After all, nobody wants us to repair things. "They" want us to buy new stuff. If you use the @before the username then the user gets notified that there is some activity (kind of like the "Bat-Signal".
Of course, we wish your wife an uneventful and speedy recovery.
@chancez perfect, that means that your backlights are working. Now you would need to measure the voltages on your power board where the main board connects to. Check the standby voltage. Not sure on your board but it usually says something like ST_BY or similar. You will have to do that with your TV plugged in and all boards connected. Make sure you do not touch the power supply since it will carry household voltage :-) It'll be VDC and should be somewhere in the 5V range.
Looks like your power supply is a Samsung BN44-00808E and on that one the STB voltage is 7.5V and when you turn on the power it goes high to 11.5V There is a jumper close to the connector that you can use to check the STB voltage.
Again much appreciated. Thank you for the well wishes to my wife 🙏. I have to get back to her but first thing tomorrow I'll be grabbing a meter and will update on voltage findings. Thank you again.
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Repairing the SAMSUNG boards is not easy. It can be flashing code or just board tries to start and then reboots. We recently had simular TV in repair and we had to replace the whole motherboard, because we didn't find the error. Error may be in ROM, or CPU, or power section of the main board. Also simular can be called with T-Con board, but that's rare.
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I was thinking that it would be the motherboard myself. Is it worth replacing the board? I know some boards can be found fairly cheap online. I have yet tried to price another board. I appreciate your insight.
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@chancez There's some chances that you can repair the board, if you got such skills and equipment. Also you have to be sure that problem is only in motherboard and power supply board is ok, otherwise you'll have to buy both of them. For some TV's there are boards, taken off from a broken TV's that you can buy on different sites. For example, on "shopjimmy" both boards repair kit costs 130$.
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@chancez and you have to be sure that LED backlight is ok, otherwise you'll have to replace it. Sometimes TV is not starting because of the backlight circuit failure. To test the backlight you must use backlight tester.
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Another piece of equipment I haven't heard of yet. A backlight tester. Not sure the cost of that either but I suppose if used more than once it would be worth it. Maybe?
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