Remove your Bluetooth and pic from the board at this time. It does not need to be in place to troubleshoot the regulator. I don't want you to potentially damage your pic from overvoltage. Then check the voltage from the regulator.

Okay... I shall remove them.. But i don't know from where is the voltage generated... There is no regulator in here...

I guess the other voltage regulator is for the bluetooth... So I guess it has nothing to do with the signal pins... My point of concern is if the voltage generated is from the microcontroller as there is no voltage regulator.. When I measured the voltage across 5V and Gnd, there is no voltage. I would even like to know how is the voltage across 5V and Gnd generated? I mean does this voltage regulator produce the voltage for both the 5V and the Signal pins?

Measure from the remaining regulator itself and post the part number that you tested. I want to see if the remaining regulator itself is working and go from there.

I tested it without any voltage regulator. As I posted the picture, I measured the voltage on the signal pins of the microcontroller in the same state. I didn't add any regulator to it.. And still it gave voltage over the signal pins. The voltage across 5v and Gnd is 0V.

Ok I understand there is a miscommunication happening here. There is one regulator on the board at this time. Any voltage on the board must come through that regulator. My recommendation is to directly test the regulator that is still attached. Probe the pos emitter leg on the regulator still on the board.

I have a doubt... We have 2 voltage regulators LM1084 and MIC29300 on EZ-B V3... I would like to know what is the function of each of these voltage regulators? I mean what is the purpose of LM1084 and MIC29300?

the lm1084 is to power the digital pins (like servos) and the other regulator is for the microchip ic