testing pic16f877a

[lerameur]

I found the problem,
I shifted the vdd nd vss pins, I could not see the hole next to the oscillator because of the big crystal. working now.

Ken

[skimask]

I shifted the vdd nd vss pins, I could not see the hole next to the oscillator because of the big crystal. working now.

I'd keep an eye on that particular PIC, maybe mark it somehow as 'possibly damaged' in case it quits working in the future.
I've put a few PICs in backwards here and there, over-volted them, 9v across a pin here and there. They always seem to work for awhile afterwards, a few have dead outputs on a few pins, nothing definitive, but you never know... Could come back to bite you in the rear end in the future...