Those blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
http://electronicshelponline.blogspot.com/https://homenol.blogspot.com/https://elektrotricks.blogspot.com/
You have to enter its service menu to reset the lamp time.
1. Enter the Option Menu <MENU><2-4-7-0>
2. V43C & V43 Chassis select "2. Reset All Settings" and <ENTER>. Then confirm "YES" <ENTER>..
V43+ & V43++ Chassis select "Initialize" and <ENTER>.
If you wish to get some details; check the site linked here. Pull up older posts or search the site by type in the brand name of your set, at its search box at the right column.. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/https://elektrotricks.blogspot.com/
check the screen first if backlight on or off .the simple method is checking backlight on or off first switch off the all lights of the room if backlight light of the tv is ok shows light blue shade whole screen
