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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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KDS 19" Avitron
I have a EVOKD-1910T that useed to make a snapping sound once in a while.
Until after such a snap it refused to start up again. The power supply is cycling, I can hear the sound of the relay and I can see the power light cycling green and yellow. Since it is out of warranty, I opened the case and found a busted electrolytic capacitor, C903, 100V 1uF, bi-polar (or non-polar). It was busted at botom, not at top, so it took me some time to notice it. I took out the HOT and measured the voltage at colector: 207V. I also could see light at CRT filaments. The HOT seemed OK when measured with an ohmmeter. I would like to ask for opinions in 2 problems: 1. Since I can trace the busted capacitor at the ABL of the flyback, do you think the flyback is busted too? Should I order a replacement? 2. I cannot find a replacement for the defective cap. I think it is a Korea Chemi-Con, KME-D non-polarized, 105C (M), 100V, 1uF. Can I replace it with a tantalum with the same values, 100v and 1uf? Thanks. Michael |
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KDS 19" Avitron
On Mon, 24 Nov 2003 20:54:58 -0500, Michael Stan
wrote: I have a EVOKD-1910T that useed to make a snapping sound once in a while. Until after such a snap it refused to start up again. The power supply is cycling, I can hear the sound of the relay and I can see the power light cycling green and yellow. Since it is out of warranty, I opened the case and found a busted electrolytic capacitor, C903, 100V 1uF, bi-polar (or non-polar). It was busted at botom, not at top, so it took me some time to notice it. I took out the HOT and measured the voltage at colector: 207V. I also could see light at CRT filaments. The HOT seemed OK when measured with an ohmmeter. I would like to ask for opinions in 2 problems: 1. Since I can trace the busted capacitor at the ABL of the flyback, do you think the flyback is busted too? Should I order a replacement? 2. I cannot find a replacement for the defective cap. I think it is a Korea Chemi-Con, KME-D non-polarized, 105C (M), 100V, 1uF. Can I replace it with a tantalum with the same values, 100v and 1uf? Thanks. Michael There is a page on FBT testing at http://www.noahtec.com/fbtest.htm |
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