george-a
Member
Hi guys,
this one had an exploded u4600 when it arrived (it smoked while the customer was testing it) and I replaced it with new one and the short seems to be gone.
now when I turn it on the fans start and stop after 1-2 secs OR can last upto 10sec - this is when I noticed that U9500 gets REALLY hot and by measuring around I got a diode mode reading on 0,018 on PP5V_S0. Of course I have no PP1V5_GPU_REG and I measure 0V on PPVCORE_S0_AXG, too.
I see PP5V_S0 is generated by Q7860, should I remove that and inject 5V with a power supply to see what gets hot? (there is also C7860 there which I may also have to remove just incase it shorts).
Should I replace U9500 first? Since it gets hot maybe thats the one shorted to ground?
Where would you start?
Please advise
BR,
george
this one had an exploded u4600 when it arrived (it smoked while the customer was testing it) and I replaced it with new one and the short seems to be gone.
now when I turn it on the fans start and stop after 1-2 secs OR can last upto 10sec - this is when I noticed that U9500 gets REALLY hot and by measuring around I got a diode mode reading on 0,018 on PP5V_S0. Of course I have no PP1V5_GPU_REG and I measure 0V on PPVCORE_S0_AXG, too.
I see PP5V_S0 is generated by Q7860, should I remove that and inject 5V with a power supply to see what gets hot? (there is also C7860 there which I may also have to remove just incase it shorts).
Should I replace U9500 first? Since it gets hot maybe thats the one shorted to ground?
Where would you start?
Please advise
BR,
george