hysung your problem is te la chip blown,sony fault la chip
most likey its damaged the ciols on your laser

repair,replacement la chip la 6508r on pcb £20
removal of old la fitting of new la £20

then your laser new laser is safest bet
old laser with resistnace added to ciol is cheap option (free) with this option if la blows again dont blame me, if it did to replace la6508r is £20 free fitting(ribbon cable fitted lat time) if it blew second time laser have to be replaced or it keep blowing

to explian the dead la chip syndrone

this is 100% fact but its thoery that most believe to be correct

faulty la chip causes extra voltage to be sent to laser, which melts the ciols enamel ,lowering the resistance

this in turn backfires on the la as the voltage sent back from the laser now has less resistance causin la to verheat

is this only comon in v9 systems?