Did you have the V4 in a power base? If so, it should have blown the fuse in the base before blowing the v4.

No, I used the adaptor sold on this site and connected + to pos (Red) and - neg (black on the battery. Maybe to much power went to the servos?

Reset button no help.

I unplugged all the servos and the EZB is working again. I must of fried my servo because if I hook them up to EZB it goes dead again. I will investigate tomorrow.

And now it make sense since the D0 thru D24 port are basically passive/Unregulated Power. I will update once I find out what I did wrong.

Thanks all. tired

The V4 has a 20A fuse plus reverse polarity protection. It can handle in excess of 12V. The power supply was not what caused the problem. It would have been something connected to the EZ-B V4 which caused the problem.

First check the servos and anything else which connects to the EZ-B can handle the 12V DC you are supplying them. Then check each item one by one until you find the item which causes the EZ-B to go dead.

Hi @Merne, Are your servos rated for 12V? I don't know many that are, this may be too much voltage for them.

I am with Jeremie on this.... If you are using 12V with your v4 then your servos are getting 12v.... That's not good... Chances are they won't tolerate more than 7.2ish... Voltage (12V SLA battery) had nothing to do with your mysterious blue smoke episode with your v4. As Rich mention a short or something connected to the board is what caused the problem... Maybe it would help for you to read up on the relationship between amps, volts, watts (basic electrical properties)?

@Merne.... before you chuck the V4, check the main fuse to see if it is blown... Maybe you just blew the fuse and instead the smoke came from something else you had attached to the V4 at the time?

Lol after getting some sleep, richard and jeremie are right. the servo can only handle 7.2esh volts. i am going to test the EZ-B tonight.

i think the ezd is ok.

thanks all