I was getting pretty bad camera noise for a while, but I figured out the wiring finally to where the noise isn't bad or anything. I tested everything on the bench, throttling up and everything and it seemed like everything was fine. So I decided to go out and do a little flying. I was using two 6s wired in parallel so I could run it a little faster. I took off in angle and punched the throttle a little bit. I saw sparks and heard a pop and no video. I'm using the akk ultra long range vtx so it has a fan on it and when I landed I no longer heard the fan. Not sure if it blew up or what. I can't see any damage anywhere on the baord, anywhere on the fc or wiring. It was only the vtx that went kapput, no other electronics.
(20-Mar-2023, 02:28 AM)hugnosed_bat Wrote: are there any leds indicate its functionality? do you get the expected voltage by mesuring pn the vtx by a multimeter?
Yeah, theres a blue and a red one I think, neither is on. I don't have a multimeter at the moment but I doubt it. I did find a pin on a chip that looks fried
I’m not quite sure I understand- wiring two 6s batteries in parallel would double your capacity, but it wouldn’t make it so that you could run it faster/fly faster.
However, if you wired two 6s batteries in series, it would double your voltage to the equivalent of 12s (44.4v). That would be significantly more voltage than the akk vtx is rated for (8v to 28v) and would absolutely cause it to go up in smoke.
How exactly did you wire your two 6s batteries?
Dangerous operations.
Disclaimer: I don’t know wtf I’m talking about. I wish I could get the smell of burnt electronics out of my nose.
20-Mar-2023, 04:04 AM (This post was last modified: 20-Mar-2023, 04:06 AM by Donovan_Gavito.)
(20-Mar-2023, 04:00 AM)Lemonyleprosy Wrote: It definitely sounds like your vtx is dead.
I’m not quite sure I understand- wiring two 6s batteries in parallel would double your capacity, but it wouldn’t make it so that you could run it faster/fly faster.
However, if you wired two 6s batteries in series, it would double your voltage to the equivalent of 12s (44.4v). That would be significantly more voltage than the akk vtx is rated for (8v to 28v) and would absolutely cause it to go up in smoke.
How exactly did you wire your two 6s batteries?
I was using two much smaller lipos instead of one big li ion, I was just saying I was using lipos to go faster haha. I know they were in parallel, I flew them like that yesterday with no problem :/ I was using a y splitter
If you had put 12s voltage through it I was gonna tell you to check your esc and fc for damage.
There’s a number of ways things can burn out- if you were within ratings, it could have been poor components from the factory, or it could have been a stray solder ball or wire whisker.
I’d be willing to bet that chip with a burnt pin is probably the vtx’s voltage regulator.
Dangerous operations.
Disclaimer: I don’t know wtf I’m talking about. I wish I could get the smell of burnt electronics out of my nose.
(20-Mar-2023, 04:11 AM)Lemonyleprosy Wrote: You said no fan and no leds- does it get hot at all?
No, I can't feel any heat from it. Camera still heats up thankfully. I was wondering if maybe soldering both on the same ground pad somehow messed it up but that's not it. Originally I had it wired directly onto where the xt60 goes into the esc but I moved it to the VBAT pad. The VBAT pad looks fine, was kinda hoping it just burned that out honestly and I could rewire into the xt60.
(20-Mar-2023, 05:25 AM)Lemonyleprosy Wrote: Combining the grounds couldn’t have hurt anything.
Your best bet is to get your hands on a multimeter to do some probing, otherwise you’ll just be shooting in the dark.
Yep. It looks like AKK offers warranty but this thing came from deep in china and it took 3 weeks to get here so I'm hoping there is a way. Just so weird that it was fine on the bench and then blew up on takeoff : (
Who knows? Maybe something tiny rolled over and shorted it out. I know I've occasionally found tiny beads of solder kicking around on my boards and was lucky enough to spot them before they became a surprise jumper.
20-Mar-2023, 05:31 PM (This post was last modified: 20-Mar-2023, 06:18 PM by Donovan_Gavito.)
(20-Mar-2023, 03:40 PM)Suros Wrote: Who knows? Maybe something tiny rolled over and shorted it out. I know I've occasionally found tiny beads of solder kicking around on my boards and was lucky enough to spot them before they became a surprise jumper.
If it was just a jumper, think there's a possibility it's salvageable?
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