Re: HP dc7800
Well, I'm done with all 5 PC's that had bulging caps. All of them started and seemed to run OK. I left each one on while I worked on the next one. On some of them I did light tasks like retesting the "Windows Experience" index. They were all set to IDE emulation, so this morning I took one of them and changed the emulation to AHCI, then reinstalled Windows from HP recovery discs. No glitchy behavior at all.
One mb got 4 new caps, two got only one, and two got two. Thanks to everyone for your input, and to Badcaps for the new capacitors.
Telkwa
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Last Activity: 05-03-2013, 01:34 PM
Joined: 03-14-2009
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Re: HP dc7800
I'll check to see if any of our local stores have "no clean" flux.
I didn't want to put more solder on the board because I was concerned about it going someplace it wasn't supposed to be. And of course I was trying to [I]remove[/I] solder, so adding more just didn't seem right. But you're not the first person to mention adding solder to remove the cap so there must be something to that.Re: HP dc7800
I'll check to see if any of our local stores have "no clean" flux.
I didn't want to put more solder on theLast edited by Telkwa; 04-25-2013, 06:46 AM.Leave a comment:
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Re: HP dc7800
Hi, Andy -
Check out post #5 above. The 40W Weller got the job done after I snipped the leads as close to the board as possible. It still meant holding the tip to the board longer than I wanted to, but the Weller worked for both removal and poking the hole clean with a needle. Oh, yeah, I kept swiping the tip off on a wet piece of sponge, which seemed to help a little. At this point I'm kinda figuring if any of these boards don't POST the damage has already been done since resoldering looks pretty straightforward.
I think you're probably on to...Leave a comment:
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Re: HP dc7800
OK, thanks, the Good Caps thread mentioned several Matsushita caps (FE & FZ I think?), but FL was only mentioned once so I assumed it was rare.
In 2005 I built my first PC from all new parts. I chose an ASUS P5GDCV board because I thought ASUS made good stuff. The board currently sets on a shelf. I picked it up yesterday and was surprised to see that it's infested with OST caps!
I might go back at a later date and replace all the OST's on these dc7800 boards, but I think for right now I need to reassemble and see if any of them work.Leave a comment:
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Re: HP dc7800
I needed to clean the holes. My wife let me rummage through her sewing gear. I assume the pins I used were SS - the solder either didn't stick, or flaked right off. Seemed like the pins were either too thin, or the next size up was too fat. I was worried about damaging the hole with the fatter ones. Woulda bought some dental picks if I'd planned ahead for this job. Readily available online and cheap. I'm sure the cheap ones are knock-offs of the real ones...Leave a comment:
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Re: HP dc7800
I came across another website about cap replacement. They mentioned snipping off the old cap leads as close to the board as possible to get better heat transfer. It worked! All the bulging caps are out and I placed an order with Topcat. Bought the Nichicons that appear to be the correct replacements.
More expensive than some of the alternatives, but I trust Badcaps.net.Leave a comment:
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Re: HP dc7800
In the first post I mentioned that all but one of the boards had bad OST's right next to the DIMM sockets. So, I thought, let's get the exact model from the one board that didn't fail. The attached pictures show the cap that replaces the OST RLA on the one board out of six. The black color made it hard to get a decent pic. The black/gold looks to this newbie like a Rubycon but it's such a stubby capacitor that all I can see for an identifier is that "W" or "M" inside the box. Anyone know what this is? AFAICT they're 10mm by about 12mm. Very short...Last edited by Telkwa; 04-20-2013, 10:23 PM.Leave a comment:
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Re: HP dc7800
Kinda looks like a pattern. My 40W Weller isn't quite strong enough to get the caps out, but maybe the guys in our electrical shop can help me.
I was kind of overstating things when I said that HP used a bunch of them. There are at most about a dozen OST's on any one board if you include both RLA and RLX. Some of the boards only have one OST, the one bulging near the DIMM sockets. Others have 3 or 4 OST's.
All the boards have 4 Sanyo's in the exact same spots. Sanyo is supposed to be pretty good, right?Last edited by Telkwa; 04-19-2013, 05:09 PM.Leave a comment:
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HP dc7800
IT dept. sold me a half dozen dc7800's, all with at least one bad cap.
I've read a couple of posts on here where people said get rid of all OST caps. That would be a big project, because HP used a bunch of 'em on these boards.
5 of 6 boards have a short, fat OST 6.3v 1500 uf cap next to the memory sticks (1st attachment) and they're all swelling. The 6th board has a black & gold cap instead (Rubicon) and that one looks OK.
There are some 10v 1K uf OST's that are swelling. 2nd attachment.
There are some taller, thinner 6.3v 1500uf OST's in...Last edited by Telkwa; 04-19-2013, 01:21 PM. -
Re: Gateway FX510X - build date 8/10/06
I don't know if topcat was out in the shop soldering away all during the holidays or what, but the owner got his board back already. The work looks very nice, and the PC runs like a champ.
Another satisfied customer.
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Re: Gateway FX510X - build date 8/10/06
Note to topcat:
Looks like the owner might send this board to you. Do you have a line of flame-resistant capacitors available? This board needs at least one.
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Re: Gateway FX510X - build date 8/10/06
Hey guys -
Thanks for the helpful answers. I'm (attempting to anyway) attaching a couple of shots just cause it's fun to look at this stuff.
Is "KZG" an actual brand?
Anyways, the pic with the one blown cap... this is, as mentioned previously, a BTX board. Guess where this cap is positioned? Right in the jet blast coming off the CPU. Not exactly inspired engineering.
The other pic shows a blown cap and a bulging one in the background. These two are positioned right along the top...Leave a comment:
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Re: Gateway FX510X - build date 8/10/06
Sorry, I didn't see an edit button -
I've been reading some of the other threads. Didn't realize that caps can fail without any visual clues.
Does badcaps.net repair service include some method for checking the rest of the board? I read the webpages that describe repair but hoping for a little more detail...Leave a comment:
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Re: Gateway FX510X - build date 8/10/06
Hi, kc8 -
This is my second run-in with blown caps. A coupla years ago a friend had an off-brand board with several bad caps. I suggested mb replacement. He's a farmer who likes to fix stuff and insisted on trying to fix the board. We bought a small sack of caps from badcaps.net, then realized that neither one of us had the right tools. I had a gun that wouldn't get hot enuf, we didn't have a good solder sucker, etc.
An electrician at work volunteered to do the job. Yay! He did pretty good actually, but the board still...Leave a comment:
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Gateway FX510X - build date 8/10/06
Friend called me - his Gateway acting weird. I brought over a box full of HDD's, cables, some PC's, Linux CD's etc.
We screwed around for hours. Swapping HDD's around, etc. In his BIOS, the IDE Configuration was set to RAID. We replaced the CMOS battery (the only reason I could think of for BIOS to go changing itself) and he was able to run Windows Repair. The PC sat for hours at the end of the Repair process saying "Please wait". He rebooted and it ran.
I asked him to bring it over to my well-lit shop so I could clean it out and replace thermal paste on all heatsinks....
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