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No  Sound  from  EZB  Or  IOTINY

The question about not having audio from the EZ-B requires a few diagnostic steps to identify the issue.

No Startup Chime - Can Connect from ARC (formerly EZ-Builder)
As demonstrated in the Learn Tutorials, the EZ-B v4 will emit a friendly startup chime when switched on.  The startup sequence involves the flashing of the status led and the startup chime.  If the startup chime is not heard, we must now identify if a connection from ARC either via Mobile or PC can be made to the EZ-B.  If a connection can be made and the EZ-B v4 operates normally, but without audio, then the issue can be easily repaired with a Phillips head screw driver.  The speaker of the EZ-B v4 is pressure fit against the case and the PCB.  Two springs emerge from the speaker which make a connection to the exposed pads on the bottom of the EZ-B main board.  Separate the plastic chassis from the EZ-B with the 4 screws. Very gently use a pair of small plyers or tweezers and extend the springs a very small amount.  Also use a Q-Tip and rubbing alcohol to clean the speaker pads on the bottom of the EZ-B main circuit board.  Re-assemble and your speaker should be operating.

No Startup Chime - Unable To Connect from ARC
Likely that the EZ-B v4 main board (bottom PCB) has been damaged.  If the communications board (top PCB) was damaged, the speaker would verbally inform you of a communications error.  Instead, the bottom board is not responding - also, confirm that there is no red LED during startup.  The lack of red LED during startup means the bottom board main chip is damaged.

In the likely hood of a damaged main board PCT, you can either replace the bottom board, or replace the entire EZ-B v4.  The bottom board can be damaged by a few ways:

• Static charge is an enemy of electronics.  The EZ-B v4 Smart Robot Controller took over a year of development and has been designed to withstand as much static charge via grounding and isolation resistors on the signal pins.  The EZ-B has additional hardware that you will not find on any other micro controller which protects against static charge.  However, even with all these preventions, there are still incidents where static will damage the controller.  Because this occurrence is rare and also incredibly random, it's difficult to diagnose and isolate an incident responsible.
• Shorting the pins accidentally.  We all make mistakes, and sometimes the power pin is shorted against a signal pin accidentally.  This can happen if connecting a servo or sensor and the pins bend and connect.  Or this can happen if a screw driver touches the pins.  Or even if any conductive surface touches the ez-b v4 pins briefly.  All servos and sensors use the same power pin arrangement of Ground, Voltage, Signal (GVS for short).  This arrangement puts the power pin in the center of the two, which means it can short either way.  If it shorts to GND, the fuse will blow.  If it shorts to Signal, the EZ-B main controller will blow. To purchase a EZ-B v4 PCB separately can be requested by contacting us directly.

"Communication Error" - Verbal Message
If the EZ-B v4 startup does not make the startup chime, and verbally speaks of a communication error after powered on for 10 seconds, the top PCB (comm board) has been damaged.  The top PCB of the EZ-B v4 is the communication board which contains the WiFi and Web Server.  When the bottom board is unable to communicate with the top board, it will inform you with a verbal message out of the speaker.  To purchase a EZ-B v4 PCB separately can be requested by contacting us directly.