M.Joshi
Member
Hello,
I am trying to repair a Dell laptop PSU which is just making a high pitched pulsed whistle. I went to probe the voltage on one of the power FETs and accientally blew it together with an adjacent resistor! I'm hoping that's all that has blown?
The FET is an ST P10NK60ZFP and the resistor looks like a low value 1W resistor? I have attached photos of the PSU, damaged resistor and adjacent intact resistor:
PSU information label:
Top view:
Rear view:
Close up of burnt area:
Intact resistor - photo 1:
Intact resistor - photo 2:
Intact resistor - photo 3:
Damaged resistor:
Does anyone know where I can find a schematic for this PSU? I have found one for a similar PA-12 family PSU but I can't work out what the damaged resistor value might be?
I think I have identified the fault with the PSU with the help of a post on another website which points to a short on the output DC cable. There does appear to be a short on the +/- pins on the output. Just wish I checked this first!
I am trying to repair a Dell laptop PSU which is just making a high pitched pulsed whistle. I went to probe the voltage on one of the power FETs and accientally blew it together with an adjacent resistor! I'm hoping that's all that has blown?
The FET is an ST P10NK60ZFP and the resistor looks like a low value 1W resistor? I have attached photos of the PSU, damaged resistor and adjacent intact resistor:
PSU information label:
Top view:
Rear view:
Close up of burnt area:
Intact resistor - photo 1:
Intact resistor - photo 2:
Intact resistor - photo 3:
Damaged resistor:
Does anyone know where I can find a schematic for this PSU? I have found one for a similar PA-12 family PSU but I can't work out what the damaged resistor value might be?
I think I have identified the fault with the PSU with the help of a post on another website which points to a short on the output DC cable. There does appear to be a short on the +/- pins on the output. Just wish I checked this first!
Last edited: