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Marcel, Thanks, yes I saw that, but I posted the new version of this part which is pin compatible with the electrical values pretty much the same. I am glad you were able to find the part NOS Peter

Thank you Marcel, That’s a good idea with the H Bridges. Not to rain on your parade, but Ceramic Capacitors, which are quite different compared to electrolytic capacitors, have usually a MTBF (Mean Time Between Failure) of 100,000 plus hours if they are of decent quality. Security Capacitors for...

Folks, i have to run some errands and will be back later tonight

Marcel, to answer your question and if my “wiring diagram “ of this PCB is somewhat close to of what you got, then failing cap would cause some damage to the rectifier diodes. Which, if a diode fails short, would almost certainly cause damage to either or both Half Bridges. I used the...

Marcel, You got two of these Half Bridges with 6 e caps and one of the yellow disk caps on each half bridge? The yellow ceramic cap connects o C1 and E2?

Marcel, i see what you mean, is the module speak the internal diodes, transistors and igbt’s ok? I am not sure if those are igbt’s, mosfet or just bipolar I attached the Datasheet

Marcel, Power semis, like the transistor / igbt module, power diodes etc, basically all the big current stuff

Marcel, i usually desolder the device I am testing when I get a reading I am not sure about. This way I know I am testing only that part.

Marcel, I would replace any power semis with IR crossover NOS AND Get rid of all off these Yellow Ceramic Disc Capacitors. It’s basically the yellow death. When they go down they can take quite some circuitry with them…..

At least something American

they could have used IR (International Rectifier) which made their products in the US until 2009 when they where bought by Texas Instruments and shipped all their production equipment to their Chinese facilities together with the equipment from National Semiconductors which they bought in 2010...

Marcel, if they measure 1V in reverse bias that means there is something in parallel to this diode on that board - otherwise it’s infinite or short

Kurt, are you going to fix your AVR / inverter too, or you just lollygagging ? Btw. what brand semis are those? Looks like a BBQ grill….

Marcel, Is this now only the diodes (no caps) Diodes normally fail fully open or short

thank you Marcel. Can you tell us the brand name of diodes and power transistor module? Thanks

These US Corporate Leaders and their Beancounters are not in the here and now anymore…….

Custom made Hitano Their Series 1 is yellow and goes up to 1000V but 0.01uF or 10nF is custom

The M in the square is the Tolerance = 20% The H indicates Hitano Caps. Taiwanese passive component manufacturer with actual manufacturing facilities in China, Basically Chinese crap custom made in yellow instead of their regular blue

Marcel, since Kurt just mentioned this, there seem to be two more of these disc caps and two other caps on this board. i would replace these disc caps with Murata or Vishay Caps once we hopefully find out who made those caps then I can cross reference them to Murata or Vishay Caps

yes, but current precedes the voltage with e caps which means the diodes and power transistor are working into a “short” when the system starts up. Piss poor design for an inverter application…..