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#16
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O.T. Dell 8200 cannot power up
I of course meant didn't.
Robert |
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#17
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O.T. Dell 8200 cannot power up
On Monday, December 14, 2015 at 9:35:56 PM UTC-8, Mark Twain wrote:
You know what, I kind of thought I had taken out the 8200 power supply before. Now I remember, I did, to grease the fan bearing with with white lithium grease. Of course, I didn't unplug the power supply when I did this. Robert |
#18
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O.T. Dell 8200 cannot power up
Mark Twain wrote:
I opened up the 8200 and did see anything like you described: http://i65.tinypic.com/1zdpvu9.jpg http://i64.tinypic.com/jsh6di.jpg rOBERT All I see in the upper right corner of the board is the 20 pin main connector. And some nylon ties holding a lot of stuff together. I don't see a 1x6 AUX connector up there, so maybe this design doesn't use or need one. You have tall electrolytic caps on either side of a toroidal coil in the upper right hand corner. One of the caps (the one on the left) is tilted at an angle. That might be a stuffing error when the board was new. Or, the rubber plug in the bottom of the electrolytic capacitor could be pushing out (from internal gas pressure). Look for a orange-brown stain on the motherboard surface around that electrolytic, if the thing is actually leaking. Sometimes the pressure relief seam on top doesn't break open, and instead the rubber plug in the bottom pushes out to relieve pressure. And this can cause the electrolytic to stand tilted on the motherboard. The layout of the machine is fairly open, so it should not be hard to get the supply out of there. But the usage of nylon ties, a nylon cable holder on the bottom of the supply, will be a slight nuisance when working on it. As long as you keep your reference pictures (like you've done), and store those pictures on the 8500, you can use the pictures for referral purposes when putting the 8200 back together again. Sometimes, when you get a new supply, the wire loom isn't long enough. That's particularly a problem for a scissor case, as it may not allow the case to be opened up all the way, without straining the wires. So when Startech says the supply is "compatible", I hope they really mean it, cable length and all. I keep a few bags of nylon ties here, and the small ones come in handy for cable dress. Don't over-tighten them to the point that they cut into the wire insulation, if you decide to use those to keep the wires tidy. Some supplies, the cables are already dressed on the outside, so you won't need quite as many nylon ties to do the job. A bag of 100, will last forever :-) Paul |
#19
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O.T. Dell 8200 cannot power up
So which power supply do I buy?
It doesn't look like there's any orange/brown stain; http://i65.tinypic.com/246116s.jpg http://i63.tinypic.com/314b7lk.jpg I would have noticed something like that however now that you brought it to my attention, the electrolytic cap on the left is tilted backwards quite a bit. So even if not leaking is this is cause for concern? http://i65.tinypic.com/v49kwi.jpg I have thought of using zip ties but the 8200 already has allot of the cables holders already in place and it's just a matter of using them. I have thought of disconnecting the cable from the front 1.0 USB ports since I don't use it anymore and would clean up the inside of the 8200 leaving only 2 ribbon connectors. My only reservation is disconnecting it from the motherboard, and how iffy is that? Thoughts/suggestions? Robert |
#20
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O.T. Dell 8200 cannot power up
I forgot to add that after opening
the 8200 up to take pictures and then reconnecting everything the amber power light and green drive light did not come on when I powered everything back up. Robert |
#21
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O.T. Dell 8200 cannot power up
I was just thinking ,..... since
there's no orange/brown stain on the motherboard that I can see maybe when I dropped the pliers it bent the electrolytic cap backwards? Robert |
#22
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O.T. Dell 8200 cannot power up
Mark Twain wrote:
I forgot to add that after opening the 8200 up to take pictures and then reconnecting everything the amber power light and green drive light did not come on when I powered everything back up. Robert So something is making an intermittent connection in there. When I look at the third of your pictures, there is a clip that holds the black Northbridge heatsink to the motherboard. Is that clip secure ? There are four "hook-eyes" soldered into the motherboard. I see one metal bar with arms on either end, and the arms fit into the hook-eyes. The metal bar is under tension and holds the heatsink down onto the Northbridge. Sometimes those hook-eyes pull out of the motherboard. I don't see a reason to panic there, but from the camera angle, I can't tell if the lower arm is properly in place or not. The reason for four hook-eyes, is the original Intel design used two metal arms which would cross over one another, but manufacturers only installed one of the arms. And on one Dell design, there is a continuity check across that arm. The motherboard puts a tiny bit of current through the arm, to detect the arm is in place. You don't have any symptoms to suggest that scheme is in place - if the arm is disconnected, sometimes it causes the computer to just fail to start. As when the "arm-detector" circuit is in place, it is wired into the start circuit, such that the computer cannot start unless the arm is fastened to the hook-eyes on either end. Your electrolytic capacitor looks fine, in terms of external visual symptoms. I don't see any leakage. When capacitors get installed, the "span" of the leads doesn't always match the hole pitch on the board, so the capacitor doesn't always end up snug and flush to the motherboard. So there's no reason to panic from that point of view. It's OK for it to be at an angle like that. Just resist the urge to go bending the thing, because you can separate the bond of the leg to the capacitor body inside, with enough effort. The only reason I wanted you to look at that, was in case internal pressure was causing it to tip over. And there would be an accompanying stain on the motherboard if that was the case, and I don't see anything there on the motherboard to support that theory. I don't know what to tell you at this point. Either the problem is on the motherboard end or the power supply end, but I just can't tell from what I'm seeing. If you want to disconnect the front panel USB, disconnecting it at the motherboard end would be the safest. On my motherboards here, the connector would be a 2x5 with one pin missing, and the missing pin is used for "keying". That's so when you plug it in, you get some hint which pin is the correct pin 1. Paul |
#23
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O.T. Dell 8200 cannot power up
I assumed the erratic behavior was due
to a faulty power supply? I opened it up again to get you pictures of the clip and a close-up of the electrolytic capacitor. http://i63.tinypic.com/124v885.jpg http://i66.tinypic.com/6qd3ba.jpg Since there's no stains on the motherboard and the clip is secure I opt for a new power supply. As I said it's already 15 years old. Robert |
#24
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O.T. Dell 8200 cannot power up
"Mark Twain" wrote in message
... So which power supply do I buy? Do you use a specialist computer store (unlike a big box store)? My experience (twice over the years) has been that when I took a nonstarting PC into a specialist store, and bought a new PSU, it was installed at the counter with no charge. It is that quick and easy, with only three or four connectors to plug in. -- Don Phillipson Carlsbad Springs (Ottawa, Canada) |
#25
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O.T. Dell 8200 cannot power up
Mark Twain wrote:
I assumed the erratic behavior was due to a faulty power supply? I opened it up again to get you pictures of the clip and a close-up of the electrolytic capacitor. http://i63.tinypic.com/124v885.jpg http://i66.tinypic.com/6qd3ba.jpg Since there's no stains on the motherboard and the clip is secure I opt for a new power supply. As I said it's already 15 years old. Robert We haven't proven at this point, that it is the power supply. Purchasing a replacement power supply and installing it, might achieve nothing. So it's a gamble. Compare this gamble, to the cost of a "diagnose" at a local computer store. For example, one store in town charges "$99 to look at it". Maybe where you live, they will do it for less. Paul |
#26
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O.T. Dell 8200 cannot power up
We have no local computer store.
If I can't do here then its not going to get done. Robert |
#27
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O.T. Dell 8200 cannot power up
Another reason for purchasing a
power supply is that as you pointed out they are getting harder to find and as I pointed out it's already lasted 15 years. It's time for a new one. Robert |
#28
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O.T. Dell 8200 cannot power up
Also 'if' there were a computer store;
buying a new power supply is a far cheaper gamble than paying someone $99 'just to check it out'. I would rather gamble with the' power supply plus you never know how reputable any given computer repair place may or may not be. Robert |
#29
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O.T. Dell 8200 cannot power up
There is no computer store in my area
and I can install a power supply. Thanks, Robert |
#30
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O.T. Dell 8200 cannot power up
Also, did you not say that if
it's not the power supply it must be the motherboard? I'm weighing all the options and it seems to me that buying a power supply is a logical choice because we've tried everything else and there was no problems previously. If it's the motherboard that's another discussion entirely. Robert |
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