On 12/4/2017 4:29 AM, 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. you

What value of resistors do you suggest? Is my idea at all feasible?

Since you want an answer about function before ordering parts,
Can you supply an external 15V to the driven circuit?
Then put the best solution for the diode replacement you come up with
and verify the switcher is functioning using an external load.
A little convoluted but reasonable to save a month wait for a second
order of parts.
Mikek