Electronics > Repair
LAN tester with burned IC
<< < (5/5)
magic:
The chip clearly contains both an oscillator and a counter, and apparently pressing the button even puts it into a "slow" mode.

Sounds like it's some dirt cheap Chinese microcontroller with appropriate firmware. Even if you could somehow identify and buy the MCU, it's still worthless without the code.
madires:
Why so pessimistic? It would be a nice weekend project with a simple circuit and a bit of coding.
amyk:
According to https://electronics.stackexchange.com/questions/34447/can-anyone-identify-the-microcontroller-on-an-hc-sr04 that pinout could be EM78P153S or similar series:
https://i.sstatic.net/Pz8cD.png
Zlobnick:
Thanks a lot everyone, I'll definitely post the results if I ever get it working  :-+
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