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I own a 2018-19 Samsung Tv, model UN60J6200AF. It was working perfectly a few days ago, and the next day it didn’t turn on at all. I did have a problem before it turned off completely where it would take a few seconds instead of instantly turning on like it’s supposed to. Anyway to fix this and turn my TV on? When I attempt to turn it own with remote or button it blinks 3-4 times, and then turns black, then I retry it and it flashes red very quickly and goes back to flashing slowly 3-4 times.

Misty Mystical  Samsung does not utilize any POST code. It will blink but there are no explanations for it. Since your TV is still relatively new, you want to inquire about the warranty status. Check with where you bought it from as well as Samsung itself. If it is covered under warranty, leave it alone and replace the TV. Should it not be covered then you can try to fix it. It is never a good idea to just blindly going ahead and replacing board. You will need to properly troubleshoot the boards. Remove the back cover from your TV and unplug the main board from the power board. See if the blinking stops and if your backlight comes on. You can see it in a darkened room through the holes in the metal chassis right behind the panel. You also will need a multimeter to measure the voltage outputs of the power supply. Post some good pictures of your boards as well as the interconnect cables so that we can see what you see and help you out further. This is not to say that it is not a failed power board but there are plenty of other reasons for it as well. To try to reset your TV, unplug ALL video inputs (including your cable box etc.), audio out devices (sound bar etc). Then unplug your TV. Hold the power button depressed for about a minute. Then connect one video source. Preferably a local one (i.e, DVD, BR or Game Console) REconnect the TV power plug to the outlet. Then try to restart your TV. Let us know what you get.

unplug the tv for about 30 mnts , it the problem not fix try to change the power supply