Re: Fixed a ViewSonic N3260w
Did you only replace the bad caps or did you replace them all (except the big, thumb sized one)?...
lazychris2000
Member
Last Activity: 10-31-2020, 12:25 AM
Joined: 03-29-2010
Location: Alaska
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Re: Precision 670 PSU squeals
BAsically, I have a voltmeter and soldering iron. I can order whatever caps I need, but I have already recapped the entire board and replaced that burnt out trace and the PSU is totally dead now. I will try checking everything for shorts when I get a free afternoon. With just a visual inspection, I didnt see anything shorted (no stray solder or anything like that), but I never thought to take my voltmeter to it.
Thanks for the tip!Leave a comment:
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Re: Precision 670 PSU squeals
So, everyone online wants to bend me over the table for shipping to AK (Seriously, I am NOT paying $75+ for shipping on a $100 PSU!), so I have been trying to find out if there is an adapter or something I can buy so I can use a standard ATX PSU? I suspect it is a [url=http://pinouts.ru/pin_Power.shtml]WTX[/url] power supply , but I cant seem to find any info about it on google. I was hoping there was just some sort of adapter I can plug into a 600W power supply I have sitting around over here instead of having to resolder everything from the dell one...Leave a comment:
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Re: Precision 670 PSU squeals
A week or so ago, I tried putting a piece of wire across the burnt trace and soldering it to the PCB (it wasnt working anyway, so i had nothing to lose...). Still dead.
Thanks for the info on freezing the caps, I will keep that in mind next time I have a squealing PSU.
I think I might just throw it back on craigslist and see if I cant get atleast some of my money back for it. $150ish is a bit more than I want (or can afford) to spend on this thing right now. There are a number of dual 604 boards online, but only the most expensive ones...Leave a comment:
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Re: Precision 670 PSU squeals
So I am pretty sure its dead now for some reason. I pulled it apart to resolder the transformer and find out what caps I would need to order when I found this (check out the pictures). That trace was most definitely not there before and I am not sure where it came from. I have not had it plugged in since I recapped it. Maybe it happened while I was testing it? Either way, it does not fire up at all anymore, and I am pretty sure this is fatal. I considered just using a piece of wire to jump the busted section, but I'm not sure that is really gonna help....Leave a comment:
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Re: Precision 670 PSU squeals
Per Hansson: I will give that a shot and see what happens. That is something I had not considered
midibob: I replaced everything 470uF or higher because I didn't have any smaller caps. I will have to order a few once I get a chance to get in there and identify them. I think there are a few of them near that little transformer, so that seems like a good possibility they are squealing.
When you say "a squirt of freezer", do you mean turn a can of compressed air over and hit it with the super cold liquid that comes out?...Leave a comment:
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Re: Precision 670 PSU squeals
Taking a measuring tape to a standard ATX power supply I have laying around (550W Rosewill), I am fairly certain that if push comes to shove, I can take out the dell supply and replace it with the power board in the Rosewill then splice in the proprietary dell connectors. The only problem I may run into would be the mounting holes, but that gives me a good reason to use my dremel
. Hope it doesnt come down to that, but if it does, it seems like a good contingency plan to me. Only problem I forsee would be the wire labeled Fan_Fail, but that is probably...
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Re: Precision 670 PSU squeals
Using a hollow pen (appearently, I have no straws), the noise is loudest coming from the little transformer, which is kind of what I was afraid of. I am a little unsure of where to go from here--is the problem caused by a failing transformer or is something else on the board causing it to squeal? I would hate to go to all the hassle of finding then replacing the transformer (not to mention having to pay like $15 shipping for a 3oz part) if something else is causing problems. Just a note, there are no burn spots or discoloration on the board and all...Leave a comment:
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Re: Flaky Dell Precision 670
Good to know I got a later rev board. Too bad it wont take the dual core xeons, tho... :/
They are Rubycom MCZ. 1800uf, 6.3V
Also, since I had forgotten I was posting here, I accidentally started a new thread about my power supply: [url]https://www.badcaps.net/forum/showthread.php?t=9460[/url]Re: Flaky Dell Precision 670<br /> ...osting here, ILeave a comment:
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Re: Precision 670 PSU squeals
I tried using a stethoscope to listen to it, but couldnt get close enough to the components cause it was metal and I didnt want to accidently short something out. Straw is a good idea...I didnt think about that. Will give that a shot tomorrow if I have time.
After accidently shocking my ear when I got too close to something, I am definitely gonna be more careful next time. I work with high voltage stuff alot, but sometimes I get kinda stupid....Leave a comment:
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Re: Flaky Dell Precision 670
For some reason, the pics didn't come out clear, even though they were really clear on the little screen on my camera, so I took them again with better lighting so I didnt need to use the flash. My board has 820uf 4V caps by each CPU....Leave a comment:
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Precision 670 PSU squeals
I picked up a Precision 670 for cheap off craigslist and found out the power supply squeals something awful when it is plugged in (under load or not). I opened the PSU and found no bad caps, I read about if it is >3 years old, you should recap/replace it (source: [url]https://www.badcaps.net/forum/showpost.php?p=59409&postcount=3)[/url]. So, I decided to recap it and see if the squealing stopped. Ordered all the necessary caps and went to soldering. Now, not only is it still squealing, it has gotten a little louder. I am having a hard time determining if it is the big high voltage caps... -
Re: Dell Precision 470 Workstation
JEWilson, let me start off by saying that you got a great deal on that. I have a 670 I bought off a guy on craigslist for $100 (dual 2.8GHz narconas, 2gb, quadro 1300) that was shipped with 820uf polys in place of 2200uf electrolytes (all but 5 that is...just had to replace all 5 of the 2200s). Will have to check my voltage when i get to work tomorrow. I think theyre either 2.5v or 4v, tho. Can post pics tomorrow, too.Leave a comment:
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Re: Flaky Dell Precision 670
I have a precision 670, but my motherboard is different from yours. I just replaced all 5 (there are 5 total) 2200uf, 6.3v caps which were bulging. None of the 1800uf ones were bulged, though. Got an order in so I can replace all of those little guys, but for now, it is running fine, with the exception of a high pitched whine from the PSU, which is also going to get recapped once my new caps get in. Anyway, my board has 820uf polys next to the cpus instead of the 2200uf (i think) that are in your pictures. Are there different versions of the motherboard...Leave a comment:
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Re: Fixed a ViewSonic N3260w
I totally agree, although in this case, I am torn. The original power board had crappy caps, but the new one had good caps. Maybe viewsonic and/or FSP (the guys who made the power board) realized there was a problem and released a new power board? Either way, I think that if I ever buy a flat panel TV, Im gonna recap it the day before the warranty ends.
Also, the picture didnt attach for some reason, so Im gonna attach it here....Leave a comment:
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Re: Video adapters - bad caps
Ive had a few video cards die after power outages, but heat may also be part of the problem. I came across a radeon 9550 in a buddy's computer which had 2 or 3 blown polymer caps under the heatsink. The fan had quit and the temp had been dangerously high(90-100C) for a few weeks before he told me he was having video problems. After scalding him for smoking near his computer and killing the fan (along with 2 other case fans), I recapped it and replaced the fan and its been running strong ever since!Leave a comment:
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Fixed a ViewSonic N3260w
I work for a computer repair shop in Anchorage, AK and had a customer bring in their Viewsonic N3260w. They described the problem as "I was watching TV, heard a loud POP! and now it wont turn on." Having fixed dozens of displays, desktops and other various electronics with bad caps, I was fairly confident this would be an easy cap replacement. I did not expect to see what I found inside....
One exploded capacitor (see picture for the remains) on the power board. It had blown off the canister with enough force to dent it. Under the aluminum cover on the power board, EVERY SINGLE...
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