It only takes one faulty LED in a strip to render the whole strip dead so chances are if one LED failed it's not impossible for others to fail in the other strips as well.
You could disassemble to TV to gain access to the LEDs and then start measuring the voltage across each LED in the strip until you find the faulty one. That way you would know for sure.
You're going to have to disassemble it anyway if you're going to replace them.
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Alternatively you could buy a [https://www.amazon.com.au/s?k=led+backlight+tester|TV backlight tester] (examples only) and then disconnect the backlights' power cable from the power board and then connect the tester to the cable and check if they all work or not. The tester supplies the power for the backlights and not the TV.
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Alternatively you could buy a [link|https://www.amazon.com.au/s?k=led+backlight+tester|TV backlight tester] (examples only) and then disconnect the backlights' power cable from the power board and then connect the tester to the cable and check if each strip works or not. The tester supplies the power for the backlights and not the TV.
hi @kvasmeister
Do you have a DMM (digital multimeter)?
It only takes one faulty LED in a strip to render the whole strip dead so chances are if one LED failed it's not impossible for others to fail in the other strips as well.
You could disassemble to TV to gain access to the LEDs and then start measuring the voltage across each LED in the strip until you find the faulty one. That way you would know for sure.
You're going to have to disassemble it anyway if you're going to replace them.
Alternatively you could buy a [https://www.amazon.com.au/s?k=led+backlight+tester|TV backlight tester] (examples only) and then disconnect the backlights' power cable from the power board and then connect the tester to the cable and check if they all work or not. The tester supplies the power for the backlights and not the TV.