EB3A no-power & not charging on both DC and AC

I have a EB3A that I used as UPS, now it does not power-on anymore. I tried plugging the AC cord nothing , I tried charging using DC, nothing. I tried to open the unit and then plug-it in in AC and there is a hissing sound in the board.

I hope someone can help me with this issue
Thank you

Hi @M4rk9133, We wonder if your EB3A sitting unused for a long time before this problem started? We’re thinking it might have gotten over-discharged.
When you mentioned DC charging, what exactly were you using? Was that including car charging? Here’s an idea - try leaving it charging a bit longer, and maybe even try AC and DC charging at the same time. Sometimes that can help wake up a battery that’s in deep sleep mode.

If none of these tricks work though, you’ll probably need to reach out to our support team to get the warranty process started.
If you have any questions about how to reach the appropriate customer service team or concerns about the service process, please send us a private message with your order information so that we can arrange priority service for you.