LeadTek WinFast PC760M02-GX-6RLS with bad caps

[c_hegge]

It's another repair project of mine which I got from work. The caps on this are as follows

VRM in:
4x 16V 1500uF Chemi-Con KZG

VRM out:
6x 6.3v 3300uF OST RLX

Other caps:
17x 6.3v 1000uF Cheapo Teapo SEK
10x 16V 470uF GSC ??? Series
1x 6.3v 3300 OST RLX

Obviously, All of these caps need to be replaced. Ruby MBZ for the VRM in, Panny FJ for the VRM Out and that extra OST, Nichicon HE for the teapos, and Panny FM for the GSC

[mockingbird]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

I have an Asus P4S800-MX that looks identical to that. I'm using it myself as we speak.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Identical, except for the CPU Socket. The ASUS P4S800-MX is Skt. 478 (Intel). This one is Skt. 754 (AMD).

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Finally, I have got the last of the caps I need, although I ended up getting rubycon MBZ for the 470uF 16v GSC rather than FM. Will go and re cap it now and post back with results.

[hardwareguy]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Japanese caps on the input and cheap OSTs on the VRM output....that's some funky logic!

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Japanese caps on the input and cheap OSTs on the VRM output....that's some funky logic!

Yes, but unfortunatly, they were BAD japanese caps.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

I finished re-capping it yesterday arvo. I am currently stress testing it. No probs so far. I gave myself a nice big burn on the leg when a huge fly landed on me and I dropped the soldering iron.

[kc8adu]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

your flies that scary over there?

[370forlife]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

itched probably

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

It was a big march fly, so if it bit me, it would have itched (and possibly hurt). Burns from the soldering iron are something I'm used to. I had it fall of the bench once when I put it down to trim the legs on a cap and, as I reflex, I caught it. Unfortunatly, I grabbed it near the tip burnt my hand and fingers.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

It's now been running for ~48hrs with no problems (I'm using it to tpye this post). Is that a good enough test? Or are there better tests? I just had an embarrasment with an asus M2N4-SLI which I re-capped (died shortly after the re-cap) and I don't want this to be another one.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

This is the exact problem I was worried about. It's stopped posting!! Any suggestions? Already tried different RAM, unplugging drives, removing PCI cards and a different PSU.

[ratdude747]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

are your caps in the right polarity? maybe you have one backwards.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

They are all fine. Remember, it ran for 48 hrs in a stress test. If any were in backwards, they would have vented by now.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Hello? Any other suggestions?

[tj2]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Does the MB power on and spin the fans? Does it find the keyboard? (I.e., do the keyboard LEDs light briefly at power on?) Is there any signal at all on the video? If the board does all these things but doesn't POST, then I might suspect that the BIOS battery died or the BIOS became corrupt. Did you try a different CPU? (Which is risky -- the board might be killing them!) I'd also use a loupe and check for small solder bridges. If you're testing the board on a bench, pressure on the back might have bent something on the solder side, causing a short.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

It's powering on and spinning the fans. The keyboard/mouse are powered by the 5vsb rail (ie. they're always on, even when the computer is off) and are getting power. there is no signal at all to the monitor (which is what I meant when I said not posting). I don't have another CPU. I can't find any evidence of a short on the solder side. I'll try re-soldering the joints, but if that doesn't work, I'll probably assume that the northbridge is toast, take the caps of and toss the board out.

[tj2]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

Do you have a different graphics card to try? I sometimes find that if the card is not straight in the slot, the board won't POST.

[c_hegge]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

I'm using the onboard graphics

[tj2]

Re: LeadTek WinFast PC760M02-GX-6RLS with bad caps

It does seem as though there could be a problem with the board itself since the graphics card is built in, doesn't it? I'd definitely check the soldering, though it's hard to see how it could have worked for 48 hours if the soldering were bad. It seems more likely that bad caps could have weakened other parts just enough to fail soon after the caps did. Is this board in a case or on a bench?