We have been having issues with servo burnout over the last year with our original v4 EZB Robots. I have been spending a lot of my time researching and learning about why this could be as I feel many cases are not from abuse (though some are).
Lately, I have been pulling out my multimeter and testing the board and motor trying to pinpoint the common point of failure. The following image shows the point of failure I found most common in my servos.
I believe this is the 555 timer chip (please correct me if I am wrong as I am still learning). After the most recent case, I decided to test the power pin voltage, which was between 8.6v to 9v. I tested this on 6 of our robots with similar results. This seems high considering we use the stock 2 cell 7.4v battery (though each battery was freshly charged). I have referenced the EZ-Bv4 Datasheet and it says the max voltage for the power pin is 16v, so I was not too worried. Though, I do remember reading - somewhere - that you recommend the power supply be between 5 and 8 volts.
Could this increased voltage be the cause of my servo burnouts?
I also noticed that the original EZBv4 (Sorry, I do not know its designation) cannot update its firmware and there has been some improvements to the hardware/firmware since it was originally released.
Is there a history of servo burnout with the original EZBv4s?
Is there any other reasons that would cause servo burnout beyond abuse?
Sorry if this seems a little convoluted, I have been troubleshooting this issue myself for months. If someone can chime in and correct me or give me some insight I would be greatly appreciative. I will say I have had a blast learning about servos and PWM in my quest to solve this issue.
Thank you in advance.