question about ps2 i.c. and disc tray

[darkerassassin]

hi! my ps2's model is scph-50006. it runs in 220v. my question is what are the cirmcumstances my playstation 2's i.c. and disk tray will become busted? the problem is when i press the eject tray button the blue button lights on and off but it doesnt open and didnt read the disc. i let a technician look into it then he said the i.c. is blown and the mechanical parts of the disc tray is busted too. its the second time it happened to me (the first time is 4 months after i bought it and then a year after it was repaired first time). thanks for any help.