Hi. I have some trouble with Asus X52N (AMD platform). All voltages are ok (baterry charging, converters, coils, kbc, pwr switch etc.) but laptop is dead. After some measurements I overheated south bridge and laptop was worked properly, so i changed south bridge for new one. Laptop worked properly for 3 days and fault was back. Laptop now are dead againg (in the same way as at the start). I overheated south bridge again and laptop again was working properly... Any thoughts what can be responsable for this situation and for damaging south bridge...?

or... NB was reacted on heat and it is dead

Ok, but how I can check this? By the oscilloscope or sth? If by the oscilloscope so could you give me some advice which should I buy and how to check something like that?