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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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UPDATE: Dell Optiplex SX260 Computer Won't Boot Up
Hi,
UPDATE: Every 2200uf 6.3V 105 deg. odd brand/no brand electrolytic capacitor (about 12) is bad on the mother board. Regarding the brand, I see what looks like, "2DIVDK", and in another location there is a "M" in a circle. There were no bulges in any cap, but a loss of capacitance as measured via a digital cap tester showing around 1400uf to 1500uf for these 2200/6.3 caps. Often an increase in ESR will cause a lower cap reading on this tester. My ESR meter is not useful on large capacity caps. I will order replacements, but since I have other good working computers, I am in no hurry. Thanks again to everyone for your replies, John |
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UPDATE: Dell Optiplex SX260 Computer Won't Boot Up
Every 2200uf 6.3V 105 deg. odd brand/no brand electrolytic capacitor (about 12) is bad on the mother board. Regarding the brand, I see what looks like, "2DIVDK", and in another location there is a "M" in a circle. There were no bulges in any cap, but a loss of capacitance as measured via a digital cap tester showing around 1400uf to 1500uf for these 2200/6.3 caps. ** A significant loss of uFs indicates VERY bad caps with high ESRs. Cos ESR rises first as the electrolyte vanishes up and only later does capacitance drop. .... Phil |
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