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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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A Schottky diode in the standby power supply of a Panasonic
TH-P42X30T plasma TV failed short but I don't have a spare or any close substitute. It's a B3100 (3A, 100V) used in a single-diode half-wave configuration. The DC output seems to be 15V. Load current, peak reverse voltage and frequency unknown. I have some 1N5822s which have a Vr rating of only 40V. Ordering parts from here takes a month or more. I'd like to do at least a temporary replacement of the diode and see if there's anything else wrong. I'm thinking of using two 1N5822s in series and parallel each with a resistor to help distribute the reverse voltage evenly. Choosing a suitable resistor value wouldn't be a problem with low-leakage Si PN diodes but the 1N5822 has a published max leakage of 2mA (0.12mA typical) at Vr(max) at 25°C, 20mA at 100°C. What value of resistors do you suggest? Is my idea at all feasible? |
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