> Some of you know in which cases an ADC converter block
> in a PIC 16F873A can stop working???

It used to work but doesn't any more ?

Help us out with some information please, like what's connected
to the ADC and what else is in or near the circuit

> In case this block is damaged, which would be the output when
> receiving an analog signal??

> Could it be possible have all "0" as output, no matter the signal
> to convert is?

If the pin has been damaged by too high or too low voltage then
probably the analogue won't get to the ADC and "0" output (maybe)

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