Quote:
Originally Posted by ortek_service
Well TTL IC's normally are fairly robust - compared to MOS types (especially more complex Memory / Processor / custom gate array etc. devices)
Although it does seem that your PSU may have gone a bit over-voltage at some point, so may be lucky if it is mostly TTL IC's that have failed and not too many expensive & rarer larger MOS ones.
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Turns out the 7403 is ok I forgot its open collector added a pull and the output is ok
I found another usb microscope today, took another close up of the hall sensor chip looks good check it out
Hall effect keyboard sensor chip
Do you think it was soldered-down Surface-mount style as I might have ago to see if I can re-solder one.