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Old 11-08-2019, 07:18 AM   #20
Join Date: Feb 2018
City & State: Bryson City NC
My Country: United States
Line Voltage: 120Vac 60Hz
I'm a: Hobbyist Tech
Posts: 44
Default Re: TCL 55S401 LED LCD TV no backlight

what iv don in the past If you want to test the back lights circuit without any led strips connected is disconnect power supply cables from all other boards. Then either bring power supply on pin low or high depending on the circuit, check to see if you have all you dc voltage outputs EX 12, 5 24 depending on power supply. Then bring your Bl_on high by inserting 3vDC into the circuit and then you must bring your BL_dim circuit High with about 3VDC and that should activate the BL-On circuit and you should have a voltage across your pins on the connector. I wouldn't leave this circuit on for a very long time.

Just my 2 cents, not trying to step on tows here I to am learning as we all discus these things.
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