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TV Turns On, Shows Logo, and Then Turns Off
Hey y’all. I have a Toshiba 55L621U that turns off soon after it is powered on. Most of my research says that this is a power supply issue, but I have seen some people say it could be a mainboard issue.
ANSWERS:
I have encountered such a problem once. You need to check whether the firmware version you downloaded to the USB memory stick is correct.
It’s a bad LED or LED strip. The TV is going into a mode that shuts everything off when the LEDs fail. The ones in the TV I salvaged were five years old and were dim or burned out.
the Led back light is bad check this video: https://youtu.be/LaV6aQ8LIpw
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