Well if it's banging fuses start with the filter block and look for shorts or leakages, that’s the bit between the mains input CN61 and the rectifiers BD62-BD63.
Check the rectifiers as a diode might have gone short. Check the chopper FET Q234 for shorts leakage.
It's also possible that one of the controller IC's has failed IC57-IC66.
Check D662 and Q617 if these are having problems they could have destroyed IC66.
These are the first few checks I would do. Good luck
