No idea, but surely it's simple to follow the ground connection from pin 31?.

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PIC programmer software, and PIC Tutorials at:
http://www.winpicprog.co.uk

 

Disconnect the two incoming power supply leads.

Remove the PIC from its socket.

Set your test meter on its lowest resistance range.

Connect the negative lead from your resistance meter to the 0V line, use the terminal block connection that you use for the incoming supply.
Keep the negative meter lead connected to this point throughout the test.

Touch the positive lead of the resistance meter to pin #31 of the PIC socket.
The meter should read zero ohms.

Touch the meter to each 0v point in turn, they should all read zero ohms.

When and if you find a 0V that dosn't read zero, follow the track back to the point where is supposed to be connected to 0V.

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Eric
"Good enough is Perfect"

PIC tutorials:
Gramo's: www.digital-diy.net/
Bill's: www.blueroomelectronics.com/

 

yes i doing that now although it's so difficult with this double sided

 

That's one of the reasons why it's often smarter (and cheaper) to do single sided boards. If you can't route it properly you use jumpers. It requires a slightly more modular board layout and inteligent control of the routing though. If you use the back of the board for jumper routing you can do things that would cost 10 times the board space using a routed PCB.

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Thank you all ...... problem solved .............simply i chnaged the regulator Lm7805.........i don't know what's the problem with first one but i'm sure it was the cause ,

Thanks again

as for the double sided boards i like it too much they are more professional