Hp D530 Sff Psu (pdp-124p)
Hi Guys,
Apparently HP D530 SFF power supplies are well known for dying when the glue used to hold the parts in place becomes conductive.
Although its not really economical to repair, I am doing it because, hey, its learning right?
There is a great page here http://webdevsys.com/d530psuRepairNotes.htm on what parts are killed when these things go bang.
But in trying to learn I have come across more questions than answers, so I hope some of the helpful people here can steer me in the right direction.
1. Can you test resisters in circuit?
2. I tried to test the MOSFET that gets killed is a FQA9N90C on the primary side. (Datasheet ) The method that I read to test it is to apply -ve lead of DMM to Source, and +ve lead to Gate. Then put +ve lead on drain. should get closed circuit?
At least thats what I read here: http://webdevsys.com/d530psuRepairNotes.htm
And similar red here: (http://www.repairfaq.org/sam/semitest.htm#stmos)
A lot of common multimeters have a diode range: you can use this to measure a MOSFET out of circuit and get a good idea of whether it is OK. Meter negative on the source, you should get no reading (open circuit) on the drain. Not on the gate but if you measure the drain AFTER measuring the gate you will find it conducts. A finger between source and gate will bleed away the charge and the MOSFET stops conducting.
the source and drain bit works for me. but then he just goes NOT on the gate? Not what on the gate?
I am so confused and frustrated...I would love it if someone here would help me. Cheers
-Al
Apparently HP D530 SFF power supplies are well known for dying when the glue used to hold the parts in place becomes conductive.
Although its not really economical to repair, I am doing it because, hey, its learning right?
There is a great page here http://webdevsys.com/d530psuRepairNotes.htm on what parts are killed when these things go bang.
But in trying to learn I have come across more questions than answers, so I hope some of the helpful people here can steer me in the right direction.
1. Can you test resisters in circuit?
2. I tried to test the MOSFET that gets killed is a FQA9N90C on the primary side. (Datasheet ) The method that I read to test it is to apply -ve lead of DMM to Source, and +ve lead to Gate. Then put +ve lead on drain. should get closed circuit?
At least thats what I read here: http://webdevsys.com/d530psuRepairNotes.htm
And similar red here: (http://www.repairfaq.org/sam/semitest.htm#stmos)
A lot of common multimeters have a diode range: you can use this to measure a MOSFET out of circuit and get a good idea of whether it is OK. Meter negative on the source, you should get no reading (open circuit) on the drain. Not on the gate but if you measure the drain AFTER measuring the gate you will find it conducts. A finger between source and gate will bleed away the charge and the MOSFET stops conducting.
the source and drain bit works for me. but then he just goes NOT on the gate? Not what on the gate?
I am so confused and frustrated...I would love it if someone here would help me. Cheers
-Al
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