mera pas hpcompaq nc6400 laptop hi, charger kharab hogya tha to os ki wire (lead) jo positive main lagani thi, woh negative main lag gaye, r jo negative main lagani thi woh positive main lag gaye, laptop k andar 1 IC (LM393) melt hogya, kya koi bata saqta hi k is kisam ki kharabi agar ho jaye to kaun kaun sa IC ko change karna hota hi?