Fried 74hc165 ?

[cimo]

hi

some of the pins on some DINs are not working, i checked with a multimeter and i can see that although the resistors are 10K the resistance between the 74165 pins and GND is around 6-8 KR, would a fried pin act like that?

I ve soldered the ICs directly to the board, but i ve done that so many times that i can t believe that i ve fried them, is it possible that only a few pins are fried and not the entire IC? maybe they were DOA?

This is really farged up

Simone

[cimo]

so i ve desoldered an IC and used a socket, now 1 pin won t work cause the corresponding pad was gone with the desoldering work... this is a little nightmare i will order new boards can t really see another way to do it properly..

doh!

simone

[/tilted/]

hi

some of the pins on some DINs are not working, i checked with a multimeter and i can see that although the resistors are 10K the resistance between the 74165 pins and GND is around 6-8 KR, would a fried pin act like that?

I ve soldered the ICs directly to the board, but i ve done that so many times that i can t believe that i ve fried them, is it possible that only a few pins are fried and not the entire IC? maybe they were DOA?

This is really farged up

Simone

6-8kR btw pins and ground is probably normal. Try reversing the probes on your multimeter, you may be taking the chip in parallel with the resistor.

Mine read around 3k6R one way, 10k4R the other.

I would say it is possible to fry only certain pins. Can't say whether you have or not.

[cimo]

i can confirm that 6-7 KR is only where the pins are broken and that inverting the probes doesn t change anything.

in one DIN4 only the first SR works (all pins) but then it seems like that the signal is not passed on the rest of the chain

weird, really, maybe i ve been sabotaged, grr