On 04/12/2017 10:29, Pimpom wrote:
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?

It is the recovery time, ie frequency that is important, surely you
could rob a shottky package from some SMPS somewhere?