P3482 dc-dc converter ic in LG home theatre dvd player

The model of this dvd is shown below

The dvd is dead but there is no burnt components on the power supply board. Checking the supply output to mainboard the p-on/off gives a vcc of 3.3v while the stb is 5v but the dvd fails to power on. The p3482 ic is located at the secondary side of the power supply board and the voltages that will start the mainboard comes from this ic

This ic is not available in my area so I ordered it online

I replaced the ic and this is the dvd working perfectly. I have 3 of this dvd with me with the same fault and I had repaired 2 by changing this ic,it remains 1 with similar problem.