model NN-SN966S Lost all control of the keypad exept Reset

Yes, Panasonic is aware of this faulty product, and has a solution. A chat with tech support today (9-12-2023) said "Yeah, those are symptoms of an internal component failing, unfortunately. Would you like me to look for a service center?"
My microwave, and dozens of other people's (read the unhappy 1 star reviews on Amazon) echo the exact same failure sequence. And they are not happy, because if it is out of the 1 year warranty-- so it's toast. For what I paid (over $350 with tax and shipping) it should have lived longer than 2 years and 6 months!

SOLUTION OK, My Panasonic SN966S Microwave suddenly died yesterday. Also after 2.5 years of average use, it suddenly started beeping and cycling through power levels before going totally unresponsive. My wife was distraught at the thought of no microwave for the next 10 days. So I dissasembled it and was able to confirm it is the Membrane keypad that seems to have failed.

I wasn't able to remove the membrane keypad, and I had no replacement redily available. So I pondered what would be the next best thing. My wife would be happy if we could warm tea or vegatables, so we don't need all the fancy extra keys.

My best estimate was that one of the rows or colums was shorting out 100% of the time, causing the keyboard Matrix to no longer be readable by the CPU.

I guessed that if I was able to break the short open, all would be good. But that looked like a lot of work to attempt to hack open the mebrane and risk destroying it, and the aesthetics would not make my wife happy.

So I experimented, with a strip of mylar about 0.2 inches wide, I slipped it into the " CN5 " keyboard connector socket, and moved it through the 9 trace positions until I found a wire that I could disable, and bring the unit back to life.

To my surprise after 6 failed attempts the 7th position gave me a bit of happiness. By isolating the 7th trace ( counting from top to bottom ) on the flexible membrane cable, I was able to isolate the short and the microwave came back to life !

I admit its not " good as new" , the "2 shows up as a 3" and the "power level button no longer works :-) ) but for a penny and 30 minutes of your time, it lets us use it until if and when we decide to replace the keyboard with a new one.

Here are the picks of the mylar strip in white

@flasharoo since there are no schematics for the keypads, it might be difficult to repair those. From what you are telling us, it sounds like a bad keypad. Of course, check it for any obviously failed component and post pictures. That way we might identify what may have gone wrong. Bilder zu einer vorhandenen Frage hinzufügen

I believe the problem is the timer or the ability to use the buttons to set the time!

88:88 That is what is displayed in the time window, when that happens no buttons

Work except reset!!!!!