Re: BlownRecap: Ripple Current ?
[size=2][i]...and no there weren't any surface mount components knocked-off, etcetera... looked for that too...[/i][/size]Re: BlownRecap: Ripple Current ?
[size=2][i]...and no there weren't any surface mount components knocked-off, etcetera... looked for that too...[/i][/size]
Intuit
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Last Activity: 08-16-2012, 10:38 AM
Joined: 02-22-2008
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Re: BlownRecap: Ripple Current ?
Thanks for the responses guys/gals. Sure it runs, but the question is, [i]for how long[/i] ? Last time there was no indication that there was any problem until it ran for several minutes and suddenly failed. That's what I need to guard against and why I fired it up for only a short time.
I've been reviewing the data over & over and had initially came to the bad-cap liklihood as well. But science doesn't operate by simply going with the most likely conclusion, but instead, by eliminating most other possibilities. For the time being,...Last edited by Intuit; 04-02-2008, 09:44 PM.Leave a comment:
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Re: BlownRecap: Ripple Current ?
Hello KC8ADU. Last time I tried to beat around the bush and explain that I am an experienced and careful individual. This time I will be a little more direct: [b]I am not an idiot or newbie.[/b] No, there weren't any capacitors or heatsinks or otherwise that were installed incorrectly. Never-the-less I appreciate your time & thoughts.
It's still preliminary (only ran for five seconds with nothing but the PSU, CPU, RAM installed) but the system now runs.
What did I do ? Reinstalled the original two Nichicon 4700...Last edited by Intuit; 04-01-2008, 04:48 PM.Leave a comment:
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Re: BlownRecap: Ripple Current ?
The only thing I had noticed before was some of the black sealer surrounding the CPU core was flacking-off (it's old) but nothing to indicate burning there. The CPU heatsink does get warm so that's a good sign I assume. In addition the fact that the power light rapidly flickered upon failure does indicate that it is a power-related issue as opposed to overheating. But maybe you're right... and honestly I hope you are. Thanks for the comment Kc8adu....Leave a comment:
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Re: BlownRecap: Ripple Current ?
I think we're confusing eachother. The originals, as stated, are the Nichicon 1500 HM and the Nichicon 4700 HD. The replacements are the Panasonic 1500 FM and Panasonic 4700 FM.
[b]HE were never used in this board.[/b] You said (that guy in the link was wrong,) the HE series weren't close to the HM series and so I just threw those specs in there too which confirms your statement. Didn't aim to confuse you with that extra bit. The HE series were never actually used, but originally pulled their specs because I did not (until you found...Leave a comment:
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Re: BlownRecap: Ripple Current ?
By the way, last time I recapped this board the first thing I did was go into the BIOS and monitor the voltages for a bit. Since no anomolies were noted before I neglected to do that this time around.
To others that may read this... don't make the same mistake. Always take an extra ten minutes or so to monitor the voltages and temperatures in the BIOS before doing anything else.Leave a comment:
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Re: BlownRecap: Ripple Current ?
Based upon the final 6.3v comparisons can you see the apparent cause of the issue, minus possible faulty component(s) ? Combined effect from having so many "higher grade" capacitors ? [size=1](same uF rating)[/size]
Nichicon 4700 HD Series [ORIGINALs]
Max Impediance 20°C/100kHz: 0.016
Rated Ripple (mArms) 105°C/100kHz: 3290
Nichicon 4700 HE Series
Max Impediance 20°C/100kHz: 0.024
Rated Ripple (mArms) 105°C/100kHz: 2650
Panasonic 4700 FM Series [REPLACEMENTs]...Last edited by Intuit; 02-24-2008, 12:56 PM.Leave a comment:
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Re: BlownRecap: Ripple Current ?
Thanks for the insight guy(s)/gal(s).
I double, tripple, quadruple and quintuple checked everything once the job was finished and before firing it up. The only possibility in that regard is that either one or more of the caps were bad or marked incorrectly to begin with. No scorch marks anywhere period, including the mosfets. (worked in product tweak, test & inspection for two years) I simply didn't allow it run long enough. The CPU still gets warm after a few seconds of running which is a good sign for it.
[b]To...Last edited by Intuit; 02-24-2008, 03:08 AM.Leave a comment:
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BlownRecap: Ripple Current ?
[SIZE=4][B]ABit KR7A-133R v1.0 board revision.[/B][/SIZE]
Greetings. Question for you know-it-all experts here.
I fired up my machine with replacement 6.3v Panasonic 1500uF and 4700uF FM series capacitors and after about five minutes of operation it crashed and now refuses to video or POST, instead continually resetting. Smell associated with failure however no smoke, burn or scorch marks on motherboard. No visible physical signs of failure at all. PSU checks out.
The original and leaking capacitors were 6.3v Nichicon [b]1500[/b]uF HM series. I replaced...Last edited by Intuit; 02-23-2008, 08:03 PM.
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