Herelink air unit won't boot up

HereLink
1

I bought second-hand herelink about 7 months ago(that time it tested well)
and yesterday i tried to use it with my 5V NI-MH battery.

and I found Herelink air unit won’t boot up. led1 & led2 are off.

I matched polarity and connected antenna well.

and I tried 2S Lipo battery, and result was same.

I pushed reset/pairing button and reflashed it, but it still not boot up.

though I can still reflash it(my laptop can recognize air unit by USB connection), and it heat itself when I connect to 5V or 7V Power & USB.

transmitter showed message that it couldn’t find air unit but i didnt tried to bind it because I dont know product key for unlocking my transmitter after firmware update.

i contacted my reseller(https://ercmall.co.kr/) but they say i have to buy whole herelink again, air module is very expensive and almost same price with whole sets…

is there possibility that air unit burn itself?

and can I check which part of air unit is defective with volt meter?

Additional : Now I performed continuity test with my volt meter
and found power line +,- are not connected.
is this mean power module burn?

2

If your computer still recognize it and even reflash it, then it should be good.

When it heat up, does any LED turn on?

Also, power the air unit with 7-12V. 5V may cause some problem.

3

“If your computer still recognize it and even reflash it, then it should be good.”
→ No, My computer still recognize it and i can reflash it, but it is not good. no led turns on.
I’m sure about this. transmitter can’t bind to air unit and only flashing firmware works.
so i contacted my reseller(https://ercmall.co.kr/) at 13th jul and sent herelink to local reseller by postbox.
(I’m still waiting for herelink to be repaired, repairing work is not yet finished and they said maybe i will have to buy new air unit.)

“When it heat up, does any LED turn on?”
->No. Any LED won’t turn on, at anytime. no LED turns on.

“Also, power the air unit with 7-12V. 5V may cause some problem.”
→ in product case, it says it can be powered on at 5V.
and in your homepage, i can see voltage range is from 6V.

I have to buy another air unit, as per my local reseller.
I will upload another post because im very angry about CubePilot’s policy.

4

The voltage range labeled on the case was printed long ago. We figured that 7-12V would give best performance and it requires at least 6V to work normally.