I have a Sceptre X325BV TV Does replacing the board correct the problem?

Some other board in the TV is drawing more power or isn't functioning at all. Use a voltmeter to be positive the power supply board is sending the correct voltages to the other boards.

I can't find a manual for either of these sets so I'm not able to be specific with parts but a set with no sound or picture is generally caused by either a bad main board or power supply. You can find out what board is bad by checking the PSON..stands for power switch on , the voltage should change when you push the on button and stay that way but going by the fact you get a blue light I'm guessing that is working and you have a bad power supply, another test would be with the set on and the light blue test the various power supply voltages and see if any are missing or incorrect, the values should be on the legends next to the connectors, they will say for example pin 1 ground pin 2...12 volts...pin 3... ground...pin 4.5 6...5 volts ect....Good luck!!

Power supply-inverter board
Check led strips

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

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Bad IR and bad board recommend replacing

TEST

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Main board fault. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/

Check its main power supply regulator board. The fault is there. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/