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Replaced my board and LED strips but still no back light.

I have an Element ELEFW504 television that was given to me because “I’m handy”. The symptoms upon receiving it was if you were trying to turn it on, it had to be unplugged and plugged in, pressing the power button numerous times to where it’ll finally come to life and from there have no problem. I replaced the board thinking that would be the fix but no. Upon talking to a tv repair person, they advised replacing the LED strips because the symptoms I had explained proved to be a short in one of the strips. So I replaced the strips and installed the replacement board and yet there is still no backlight. If I do the flashlight test I can see the menu when prompted and all other features but not even a flicker of a light from the backlight. What did I do wrong or what did I not do? Please help.

Update (04/13/2020)

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here is the old board.

Update (04/19/2020)

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board with the connections

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Replaced my PSU and LED strips and 8 months later same issue.

This Element E4SW7019RKU TV had a backlight issue in March of 2022. When replacing the backlights notice three or four LEDs had burn marks around them making black marks on the back whitepaper. After replacing the backlights & testing them, there was a clicking sound from the PSU and an over voltage reading to the backlights, and the new backlights did not function. I decided to replace the PSU. Installed the new PSU and TV works.

Fast forward to December of the same year. TV started exhibiting the same symptoms as before. No backlights, there are the appropriate images on the screen when a flashlight is used, the PSU is again producing overvoltage to the backlights. When both backlights and mainboard is plugged in voltages are 413 volts 362 volts from left and right output sockets on PSU. Compared to 275V & 82 respectively when both mainboard and backlights are unplugged from the PSU. Is it possible that the MOBO is at fault here?

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nicolette bennett … typically, if a power board is supplying proper voltages to the main board and the led’s/led driver board the power supply is fine. (did you test this?) If you have no backlights with proper voltages from the power supply and there is no led driver board, it could very well be the leds gone out and can test with a backlight tool or supplying voltage directly to the strips to test. (does your unit have an led driver board?)

https://www.google.com/aclk?sa=l&ai=DChc...

Being that you have an image on your screen, the tcon board can be ruled out. your input buttons…menu and power are functioning so there is logic from your main board….but a main board can be at fault and not tell the power board to kick into high voltage for the leds. Being that you replaced the power supply and the led’s can rule them out as well. So this leaves the main board or an led driver board if you have one.

if you need more assistance, post back with some pictures of your boards and the back of the tv so we can view.

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This TV only has one board unlike other TV’s I’ve helped fix. I had purchased the board from a reputable store where it’s guaranteed to function fully as well as the strips. I do not have testers anymore (they got lost in a move) but I probably should reinvest in them once again. Could the actual wires from the strips to the board possibly be at fault?

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its possible...easily check with continuity test on each wire. So there is only one board in the whole tv? if this is truly the case and you replaced both the led's and the only board in the unit...assuming the board and led's are good then that leaves your display and typically is uneconomical to replace. id like to see the setup on this.

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that looks like a combo board. seems that the mains is on another plug based insert for this board. i guess that doesnt matter, but could be potentially another failure point. could you post a picture showing the entire back with the cover off?

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Yes I will in the morning. Thank you for all your input so far, I really appreciate it.

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My apologies for taking so long to reply but I’llpost that picture now

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Nicolette Bennett estará eternamente agradecido.
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