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works on breadboard, but not on pcb

PostPosted: Wed May 31, 2017 1:29 am
by ttirupathi
Hi, I made esp8266 client for chatting. Initially I designed and tested the complete schematic on bread board and it is working fine. Late I made a pcb for the same circuit and I soldered all the components, like 2X16 display,MCU(atmega328p-pui), crystal, voltage regulator(5 to 3.3) volts and some push buttons. When I soldered all the componets and upon applying the power, it is continuously restaring, and my board(design) has a buzzar, it is continuously giving sound, instead of giving sound upon receiving the message in chat room.

The same module(esp8266-01), if I connect using the jumper wires and female burg strip(soldered to pcb at place of esp8266-01 module by desoldering the esp8266-01 module from pcb), it is working fine(as expected).

What could be the problem?

Thank you.