This IC in on the controller board of our Sebo X4 vacuum cleaner, which suddenly stopped working. At first, I thought it was just a case of dirty contacts, because I dismantled it, cleaned everything, reassembled it and it worked again, but only for a day, then it died again.
There's not a lot on the PCB, just this chip, the blue 8 MHz ceramic resonator (its outer pins connected to pins 3 and 4 on the IC), what seems to be an op amp and a triac, a few capacitors, diodes and LEDs and a load of resistors. For so few components, a replacement board is ridiculously expensive at £100+ and as the vacuum is almost 10 years old it's not worth spending that amount to fix it. Therefore I'd like to try to diagnose it, but without knowing what this chip is, I have no idea what readings to expect from it. I've spent ages in Google, on Mouser, Farnell and various other suppliers trying to find a datasheet but with no success.
I'll happily supply any other photos of the board or any other info that people might find useful. Any help or suggestions would be very much appreciated.
Thanks in advance.