Mystery Problem with Standalone Arduino

hello all,

i built circuit board designed have atmega328 communicate sm130 rfid chip.  i'm received boards , assembled them, they're acting strangely.  whenever try program on commercial uno board, works fine.  if remove microcontroller , plug socket on board, doesn't work @ -- simple sketches blink.

i've attached image of schematic.  checked following things on board:

-+5v on vcc, avcc, aref, reset
-gnd on pins 8 , 22.

i have external 16 mhz crystal 2x 22 pf capacitors.

as far can tell, there doesn't seem shorts, i'm @ loss how approach further.  said, if upload blink sketch on uno board, can test pin 13 (pin 19 on microcontroller) see if square wave -- , do.  place atmega onto board's socket, pin 19 stops outputting square wave.

any thoughts on how move forward?  general troubleshooting techniques appreciated.

except connecting aref +5, should have 0.1uf gnd,
and not have 0.1uf caps on vcc , avcc gnd, design looks okay.

how testing sck output? 1k resistor led anode, cathode gnd?
does chip feel @ warm touch?

Arduino Forum > Using Arduino > Microcontrollers > Mystery Problem with Standalone Arduino

arduino