Chosen Solution
My 50uf8300 lg 4K smart tv standby light is flashing 3 times and won’t come on. I’ve already replaced the power board and that didn’t fix it. What else could be wrong?
Hi @taylorc1t2 , Here’s an image from the troubleshooting section of the service manual for your TV. (I think it is the right manual, apologies if it’s not - click on the Download link just below the Doc preview box). Since you have replaced the power board and perhaps have checked that the power board output voltages are OK, the flow chart seems to indicate that replacing the main board is the next step.
(click on image to enlarge for better viewing)
