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Hi Lisa,My name is***** will try my best to help you with your question.
If the boards were purchased from a reputable supplier and are good, but the TV still will not turn on, then the fault may be with the display screen itself.
Approximately how old is the TV? Is it still under warranty?
Were they new or used boards? Do you have a schematic diagram available to test them?
I mean a circuit diagram for the TV so that you can carry out some diagnostic tests on it...
The circuit diagrams will not be included in the regular user manual, however they will be included in a service manual.
Ok, let me check if the other experts can assist further with this...
Hi my name is***** am a TV and Electronics expert here on Just Answer.
If you still need assistance I would love to help.
Please lets back up , you said before you replaced the boards it was clicking and not working.
I need to know what the power light was doing before and after replacing the boards.
You may have a bad board that you purchased or something else could be wrong
respond with the power light symptoms , before and after. mark the boards so you know which are the originals and
let me know if there is a difference with the new boards or exactly the same symptoms with any board in the TV
Please respond if you still require assistance.
OK I'll check back after you post what you find, thanks Eric
ok reading sorry
Sounds like a bad LED bulb inside the screen. I replace these all the time , but have damaged and cracked the front screen taking it off. this is a LINK to a set of LED strips
similar process for replacing them HERE
I usually remove the front and with the tcon unplugged I turn on the (no front TV) laying face up with nothing shorting out
the LEDs should flash on and you can see which ones don't light up ,
also before turning it on visually inspect each LED bulb, if some look black burnt they are bad,
you can test each bulb using a voltmeter that has "diode checker mode" and at least 5 volts output.