Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
ah, ok then. No 6pin on this. So the question is then, whats the power rating i need to load it to test?...
Barf
Member
Last Activity: 02-25-2011, 07:58 AM
Joined: 01-30-2011
Location: Selby, UK
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
thats what im a-thinking. I have spare headlamp bulbs for my car, 12v 55w halogens. Not sure what to load it up to though. From what ive read it seems the 4pin connector was added to provide more power originally for 2x PCIexpress slots at 75w each, so perhaps loading it up to 110 - 165w (2-3 bulbs) would be enough to show any problems under load?...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
not possible, i dont have any spare old stuff - computers i only fix when i have to!...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
Hi, yes you have it right. I bench tested the PSU. With the PS_ON line shorted all the voltages read ok.
I do agree with you, it does seem most likely that its the mobo thats failed. My worry, is that something fails with the PSU when its having to supply a decent level of current. Obviously with only my multimeter on it its not having to do any work! If i can load the PSU up on the bench and prove its ok when supplying a decent amount of current, i'll be happier attaching it to a new board!
In effect,...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
I think this might all be getting a bit complicated and muddy! Heres the tale so far, in bullet points!
1. Obtained complete PC
2. Dead on arrival - Pulled PSU and bench tested
3. PSU believed dead, although could be made to run on bench
4. PSU replaced with identical unit from an identical PC - worked for quick test
5. PC died a few minutes after start-up (once it was 35mile from the lab!)
6. Diagnostics showed PSU died when 4-pin connector connected
7. PSU pulled and bench...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
Seanc, no obviously blown caps, no obvious problems at all - unless you count the abortive attempt of mine to lift one of the fets for off-board testing! (i now definately need to replace at least one fet
)
As ive noted on the thread running about the PSU for this machine - it looks like im at risk of getting into a fault loop, with each device killing the replacement!
Im now on the second PSU (both same type) and have a spare mobo (same type but thoroughly soak tested!) being shipped to me....Leave a comment:
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Re: FSP250-60GTV circuit diagram?
ok, so were having a bit of 'fun' here at Chez Barf with this PC!
A visit to the uni workshop resulted in a swap of PSU, for one of the same model, which worked in the lab during a brief check, but the machine died again later! It looks like the mobo was the cause.
The chaps at the uni are posting me a replacement mobo out (thats been thoroughly soak tested), along with a spare and its CPU to use as a reference to fault find the dead one.
Now, im worried that we could be getting into a 'fault loop' with...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
ok, i could be barking up the wrong tree here, but there are two SMT parts, marked 545 T40 N03G, that read short across their pins, located next to each other and very close to both the CPU and 4pin connector. It apears from a rudimentary search on google that these are N03G switching power MOSFETs.
They look like good candidates, provided of course their reading short from gate to source isnt as a result of something else in the vicinity.
I dont fancy placing an order for them if they are not likely...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
Ok, sounds plausible. Question is then - how to locate it?
In an ideal world (and as is the case with everything else i repair) i'd have a schematic of the circuit, so know where and what to trace. I dont have that in this case, and dont know the circuits in question.
Can you suggest to fault finding tips?...Leave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
Im tempted to pull the first cap and see if i get anywhere with it out of circuit. Anyone see a good reason not to try this? ok so the smoothing will be out and probably reduce the stability of the rail, but hey its doing nowt anyway!
I can test the caps but only for value, ive no ESR or leakage meterLeave a comment:
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Re: Intel D945GTP (PLM?) dies when 4pin Molex connected
Sorry, badly written. No, neither PSU work with it. I only have the 2nd one though - the first was swapped out back at the uni's workshop.
1st PSU - dead
2nd PSU - ran for a few minutes, now dead
A bit of further info - Just done a resistance test between the connector (on mobo) and ground, and its only 4ohm, that to me is far too low (incidentally - im an electronics engineer, but my field is radio comms not computers!) and suggests something not necessarily shorted out,...Leave a comment:
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Intel D945GTP (PLM?) dies when 4pin Molex connected
Hi Chaps,
I have here a Viglen P4 machine with an Intel D945GTP motherboard (it may be a PLM, im not sure as it has both numbers on it! and i dont know how to diffrentiate them)
Connecting the 4pin molex CPU connector kills it. With just the 20pin power plug, the CPU fan will run when the power switch pins are shorted (but of course i cant get any further).
Can anyone suggest what might be the fault? This is the second PSU tried (both the same type) and it did start running when it was first fitted, and ran for a few minutes. Both PSUs were second hand and... -
Re: FSP250-60GTV circuit diagram?
well, with it open on the bench, after a bit of wiggling of that resistor its started running. So im going to link out the PC tracks from that resistor to ensure that the connections good. It might not be the fault, but its a startLeave a comment:
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Re: FSP250-60GTV circuit diagram?
cheers, that sounds like the same symptoms!
I'll open her up again shortly and see what i can find.
Do you know if theres a 'primer' anywhere on how these supplies work? I could do with at least learning the basics of their operationLeave a comment:
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Re: FSP250-60GTV circuit diagram?
Everell, what were your symptoms on that one? I can see that the trace could break very easily. If the regulator for 5v cant see its load resistor, would that cause the whole unit to fail? I understand theres a 'power good' circuit, but no idea how it works!Leave a comment:
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Re: FSP250-60GTV circuit diagram?
Hi Chaps,
Scenic, yes that does indeed look the beast! The unit i have has a smaller PCB attached to that heatsink top but otherwise looks the same. Yes, that is indeed the resistor to which i refered.
I would very much appreciate any advice on fixing this unit. Ive been a communications engineer for over 10years, but computers and especially their PS's are not my field at all (i can knock a linear supply up for anything you like, but SMPS's i have no idea!). From what i can gather this resistor provides a base load...Last edited by Barf; 01-31-2011, 05:03 AM.Leave a comment:
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FSP250-60GTV circuit diagram?
Hi,
I have an FSP250-60GTV ATX PSU that has failed. It doesnt respond to the PSU ON signal.
Internally, there is a very obviously burnt up high wattage resistor (which i believe from another thread about this model to be a 5v load), however, resistors dont often fail on their own, so im suspecting a semiconductor somewhere may also have failed.
Does anyone have a circuit diagram for this model? I dont have the value of this resistor and i have no previous experience working on ATX supplies, so will need the diagram to go on
Cheers...
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