Tcl 55” Backlight issues. Replaced leds still nothing. Power board?

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My tcl passed the flashlight test. I made an assumption it was the LEDs so I replaced them with a set from Shopjimmy. Put it back together and same problem. 

I’m guessing either I screwed up installing the leds, one of them is bad brand new, or it’s something else. 

I went to see if I have any DC voltage at the led plug and I got nothing. Can somebody confirm if I have a bad led will that cause me to not have any voltage at the led plug on the power board?

If not what voltage should I expect to see? And if the tv powers up no problem and boots to the Main menu would you guys suspect a power board issue? TCON? Something else

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0

crwdns2944067:03crwdne2944067:0:

What is your TV's model number?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

55s405tlaa

Thanks!!!

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

I had no luck finding a service manual... What voltages are you getting at the led connectors? Are they stable?

crwdns2934271:0crwdnd2934271:0crwdne2934271:0

crwdns2934285:0crwdne2934285:0