LG 42PC1DA repaired psu also FS1 blows help please

[Tmg]

Hello
I have replaced all the 3300uf 10v caps in the power supply,
also now have noticed that FS1 on Z-SUS board keeps blowing 4A
is the IC on the Y-SUS board anything to do with this?
Or what should be done to repair the Z-SUS
any help please
Thanks in advance
Tony.