Hello Friends,
recently, i've made an BLE to RS485 interface board. ( it contains nordic's BLE soc; Sorry for that )
anyway, i've done my artwork and order pcb and hand soldered the pcb.
but some boards only can Receive ( Transmit not working ) , And the others can only Transmit
what's the problem ? did chip die when i do hand soldering ? if i do SMT process is it work properly ?
i attach my schematic , i need your help freinds !