Re: EPIA ML Re-Capped but does not power-up
Hi, Thank you for your reply. Checked the soldering and all seems okay however did notice that the desoldering pump that was used did cause slight damage to some of the solder pads. Ensured that the plated through holes had solder running through them and that any of the solder pads that were slightly damaged had continuity with the track that they were joined to.
Gave up using a desoldering pump as it was causing too much damage. Learn as you go along though.
Successfully recapped mainboards...
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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EPIA ML Re-Capped but does not power-up
Hi,
Can anyone offer any suggestions as to what could possibly be wrong with a VIA EPIA ML mainboard that has been re-capped (1500uf and 1000uf capacitors replaced in their entirety) however unfortunately still does not boot?
Further details can be found on the following thread:-
[url]https://www.badcaps.net/forum/showthread.php?p=70151#post70151[/url]
(thought that I'd better start a new thread as the mainboard has been re-capped now).
There are smaller electrolytics on the mainboard is it recommended that these are replaced also?...
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Re: VIA EPIA ML Mainboard no longer powers-up
Hi,
Thank you. At a guess the APL1084 is working properly as the 3.3v supply rail is the only supply rail that is working however no doubt it shouldn't be getting so warm. Is it worth recapping the 1500uf and 1000uf electrolytics in particular? is the replacement of these likely to cure the 'will not POST' problem and allow for the other power rails to operate as they should do?
Thank you....
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Re: VIA EPIA ML Mainboard no longer powers-up
Hi,
Checked the 1500uf and 1000uf electrolytics and they are HM(M) and KZG.
Some photos that have been taken (apologies they're not very good quality) are as follows:
[url]http://img266.*************/img266/4932/image031x.jpg[/url]
[url]http://img17.*************/img17/4896/image032lec.jpg[/url]
[url]http://img17.*************/img17/5885/image033ekw.jpg[/url]
Best Regards.Re: VIA EPIA ML Mainboard no longer...Last edited by newbie2linux; 05-12-2009, 05:13 PM.
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Re: VIA EPIA ML Mainboard no longer powers-up
Hi to all that have responded to this thread and thank you for your suggestions. Every effort will be made to post some photos late this evening.
Having quickly checked the mainboard again I've noted the following:-
1. The two largest capacitors, 1500uf, 10v have the Chemicon logo on. These are adjacent to the ATX PSU connector.
2. The other larger capacitors, 1000uf, 6.3v are all Nichicon electrolytics.
3. The part number on what we think is a FET is APL1084 WHCDW (Q9 on mainboard)....
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Re: VIA EPIA ML Mainboard no longer powers-up
Hi,
Thank you for your reply. Much appreciated. Just so that I've interpreted this correctly regarding the high esr that you have mentioned does his basically mean that faulty electrolytics generally have a very high resistance whereby they're acting like a resistor rather than a capacitor?
Not 100% on how to go about testing whether the transistor/voltage regulator has gone faulty however would not be surprised if it's cooked itself as it was almost impossible to touch due to the amount...
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VIA EPIA ML Mainboard no longer powers-up
Hi,
Does anyone know whether electrolytic capacitors can be faulty on a mainboard such as a VIA EPIA ML whilst externally they look like healthy capacitors?
Do faulty electrolytic capacitors go open circuit or short circuit?
Checked the power rails using a reasonably inexpensive PCI Post Card and only the +3.3volt rail is powered-up however a transistor/voltage regulator nearby the BIOS gets extremely warm.
Would consider re-capping but none of the electrolytics look like they're suffering from any form of fault condition.
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