Duff CDA Microwave WD900DSL23

I couldn’t repair this one…

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I don’t normally take on microwave repairs.  I don’t have reasonable means of testing, even if I managed to get something working.  However, a friend asked me to look at this one to see if ‘something simple’ had failed.  This particular model also fitted nicely in her kitchen on existing wall brackets and the thought of refitting all the brackets for another machine seemed daunting!

The microwave was doing something strange:  With microwave plugged in, the turntable turned slowly on its own, the display and control buttons completely unresponsive.  Disconnecting the power first, it was time to completely ignore the ‘do not remove cover’ sticker and remove the cover.  Hey, someone must have assembled it to start with?

A quick look at the control board revealed no obvious faults and all the thermistors and micro-switches seemed to work OK.  Since there was no other item controlling the components in the oven, it was off with the control panel PCB.  After basic testing of the surface components, I decided to run the soldering iron over the connections, in the hope that I might clear a dry joint.

This was not to be.  With the PCB reconnected, the oven powered up, the same thing happened, the turntable operated by itself.  The board was duff!

Sadly, this microwave is heading for the great scrapyard in the sky since control boards for these ovens are outrageously expensive with the cost of replacement far outweighing the cost of a complete machine.  This is such a great shame.

I doubt that many parts vendors sell many of these PCBs as most owners wouldn’t bother to order at the prices I’ve seen.

Still, we tried to save it.