Veteran electronics engineer but first time poster here, hailing from Amsterdam. A good friend and B&O fanatic has four Penta mk3 displays that are all four dead. He sent them to me and because I have no B&O equipment I created PIC software (PIC12F683) to emulate a Beolink command. I did quite a bit of research online and found information to build a test command. I also compared it with the command from my friend’s Beocenter, and they were equal. Still no luck. Grounding the test pin (#36) of the micro makes the 12 characters show 12 times I-H-#-$ so the micro seems to be OK as is the display board with the alphanumerical displays. I am out of inspiration about what could cause the four displays to go dead. Power is OK, all capacitors have been replaced earlier on.
How do I fix these displays?
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