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Sep 25, 2018, 06:25 PM
Registered User
FotoAmg's Avatar
Quote:
Originally Posted by DucknDive
My mobius was showing exactly the symptoms described by Flying Pitcher https://www.rcgroups.com/forums/show...ostcount=16955. Solid green LED, which never goes out. Camera won't respond to button presses or record anything & wasn't recognised by msetup.

Given it was a brick I had nothing to lose, so decided to try solder reflow, despite being nervous of killing it for good. With reference to this helpful post https://www.rcgroups.com/forums/show...ostcount=14509 I first wrapped the side of the PCB with the lens and battery connectors in foil as shown in the photo. I left the side with the image processor chips uncovered (although to be fair there was no way of knowing where the open circuit connection was, or indeed whether there was one at all). I didn't have any flux so omitted that step.

Next I heated by domestic electric fan assisted oven to 200C for ten mins and baked my mobius, foil side down for four mins. I left it to cool outside the oven for ten mins then tested. Same solid green led, no change.

Second time around I again preheated to 200C but for 15 mins and then baked the mobius for 5 mins. Same result, still dead.

Maybe I was being too cautious? I again heated the oven to 200C and this time gave it seven mins. After ten mins cooling I plugged my lens module, battery and Sdhc card in and tried powering the camera. I was amazed to find it booted with a normal startup sequence of blue led, three flashes of the red led by the memory card, then a pause and an orange led came on. Pressing the shutter button I successfully recorded a test video and when connecting to the PC I could connect to the camera in msetup and updated the firmware! Case closed? No, not quite. Because what I found when I transferred the PCB into a mobius case was that after screwing everything together I was back with my dead mobius which only shows a green led. Much disconnecting and reconnecting of lens module and battery did nothing to change this. I was pretty cheesed off to be honest.

Ok, time to throw caution to the wind. Either my PCB was cracked and it was just chance that it had worked, or the bad solder joint had started reflowing far enough to make a temporary joint, but it hadn't been formed enough to stay connected once I screwed the PCB into the case. Whatever the reason, I still had a brick of a camera and nothing to lose. I also had little patience or need for subtlety, so the oven was cranked up to 210C and preheated fifteen mins. The camera was baked for 7 mins and I'm delighted to say that it has resulted in a complete fix which is still working ŵith the camera all screwed together in the case.

I hope this helps someone, although I would probably still advise starting towards the lower end of the temp scale as it's possible my bad solder joint was simply on the underside of the board, shielded by the foil and this might be why I had to get a bit heavy handed with temp and duration. I may have got close to what the board will take as the battery connector has definately darkened in colour.

I think the above does prove however that the board will tolerate temps of 200-210C for five to seven mins (as long as the plastic connectors are shrouded in foil) and that in itself may be a useful reference point for someone in the future. It's also worth pointing out I suppose that a domestic oven after ten or fifteen mins preheating may not be hitting quite the advertised temperature, so proceed with caution. Don't preheat your oven to 200C for an hour then wonder why your results vary from mine! Having said that, my fan assisted oven does come up to temperature quicker than any I've previously owned, so if yours is slower to warm up then maybe you need 20 mins of preheating? As they say on the back of TV dinners - ovens do vary!

Please note the photo, the foil was crimped as tightly as I could manage around the PCB edge while leaving the top side exposed. I trust this somewhat verbose description will help someone else achieve success in the future. For now I'm just happy I have a working mobius again
I think I have to give this a try, I have 2 completely same way Mobius and one freezing all the time... an electric oven with fan assisted and flux..

edit: what did I cook? too much smoke coming from it:
what did I cook? (0 min 29 sec)
Last edited by FotoAmg; Sep 26, 2018 at 01:12 AM.
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Sep 25, 2018, 06:28 PM
Registered User
Quote:
Originally Posted by Tom Frank
Some of this info is in the initial InfoPost here (#3 or 4), along with some side-by-side video comparison. But I did not try to exactly measure the FOV in all cases.
Thanks for the reply.
I wasn't sure if later firmware changed the FOV at all and if so by how much. It is relatively easy to measure so I may repeat the tests and carefully check calculations.

Best regards,
David
Oct 26, 2018, 09:34 PM
Let's build something !
ruben's Avatar

Mobius action cam not powering up fixed using step-up converter


Hi !

My Mobius sudenly stoped working using internal battery.
This is my favourite hd cam to use onboard on my rc planes !
Tried and checked everything to make it work again. New batteries, checked battery socket, solder joints, applied heat with heat gun, etc etc.
No led activity !
Decided to use an external 1S Lipo battery (3.7v) and a step-up converter to 5v and use USB port to turn it on.
It worked like a charm !

In the future will try to reduce weigth removing the usb plug and soldering mini usb plug directly to step-up converter.


Mobius action cam not powering up fixed using step-up converter (3 min 0 sec)
Oct 27, 2018, 05:49 AM
Registered User
dirkzelf's Avatar
Quote:
Originally Posted by ruben
Hi !

My Mobius sudenly stoped working using internal battery.
This is my favourite hd cam to use onboard on my rc planes !
Tried and checked everything to make it work again. New batteries, checked battery socket, solder joints, applied heat with heat gun, etc etc.
No led activity !
Decided to use an external 1S Lipo battery (3.7v) and a step-up converter to 5v and use USB port to turn it on.
It worked like a charm !

In the future will try to reduce weigth removing the usb plug and soldering mini usb plug directly to step-up converter.


https://youtu.be/lv8VfTQibiw
Have you tried running the mobius at 3.7v again after the step up setup?
Oct 27, 2018, 06:50 AM
Registered User
FotoAmg's Avatar
Quote:
Originally Posted by ruben
Hi !

My Mobius sudenly stoped working using internal battery.
This is my favourite hd cam to use onboard on my rc planes !
Tried and checked everything to make it work again. New batteries, checked battery socket, solder joints, applied heat with heat gun, etc etc.
No led activity !
Decided to use an external 1S Lipo battery (3.7v) and a step-up converter to 5v and use USB port to turn it on.
It worked like a charm !

In the future will try to reduce weigth removing the usb plug and soldering mini usb plug directly to step-up converter.


https://youtu.be/lv8VfTQibiw
It does not work with internal 1s connected? Not the mobius original battery but some other lipo cell?
if you stay with 5v external that stepup is too big, there are much smaller ones without usb plug and video out cable has 5v input wires no need to have usb cable
Oct 27, 2018, 06:48 PM
Let's build something !
ruben's Avatar
Quote:
Originally Posted by dirkzelf
Have you tried running the mobius at 3.7v again after the step up setup?
No. But why should I ? It just wasn't working anymore with internal battery,
Oct 27, 2018, 06:53 PM
Let's build something !
ruben's Avatar
Quote:
Originally Posted by FotoAmg
It does not work with internal 1s connected? Not the mobius original battery but some other lipo cell?
if you stay with 5v external that stepup is too big, there are much smaller ones without usb plug and video out cable has 5v input wires no need to have usb cable
No it doesn't. Tried everything and it was just completly dead...
I know this setup is to big and will remove usb cable in the future. I will also remove the USB socket on step-up converter and solder it directly to mini usb on mobius.
Oct 27, 2018, 11:17 PM
Registered User
dirkzelf's Avatar
Quote:
Originally Posted by ruben
No. But why should I ? It just wasn't working anymore with internal battery,
I'm just thinking it might have reset something, so therefore I'm just curious, if it happens to me or others it might be a solution to go back to what it was before.

That's all.
Oct 28, 2018, 05:44 AM
Let's build something !
ruben's Avatar
Quote:
Originally Posted by dirkzelf
I'm just thinking it might have reset something, so therefore I'm just curious, if it happens to me or others it might be a solution to go back to what it was before.

That's all.
Oh ok understood... But it worked before with external power. And I tried all sorts of reset i've read.
I think that something wen't wrong with the board. But couldn't find anything burned or loose. So... Tried this solution and it worked for me.
Oct 28, 2018, 09:55 AM
Registered User
dirkzelf's Avatar
Quote:
Originally Posted by ruben
Oh ok understood... But it worked before with external power. And I tried all sorts of reset i've read.
I think that something wen't wrong with the board. But couldn't find anything burned or loose. So... Tried this solution and it worked for me.
Well, that's

If you ever try the battery version again then please let this nosy rosy know....!! HAHA

Oct 28, 2018, 10:33 AM
animator in Helsinki, Finland
Quote:
Originally Posted by ruben
No. But why should I ? It just wasn't working anymore with internal battery,
Batteries die of old age - sometimes even in a year or less.

That's why the suggestion for trying another battery is a good idea...
Nov 07, 2018, 09:03 AM
Hi is it possible I can I get a layout diagram for the circuit board for the Mobius 1 as I have damaged my mini USB socket when removing the socket one of the tracks got damaged so I need to trace it to implement a repair on the board. Thanks in advance.
Nov 07, 2018, 09:59 AM
Let's build something !
ruben's Avatar
Quote:
Originally Posted by Janke
Batteries die of old age - sometimes even in a year or less.

That's why the suggestion for trying another battery is a good idea...
The suggestion wasn't about try another battery but try internal battery again after connection to external power.
By the way: I've tried three diferent batteries before this fix. And tested them all also. I'm using them now but connected through step-up.
Nov 07, 2018, 10:21 AM
Let's build something !
ruben's Avatar
Hi,

Finally had time to finish the ugly Mobius fix I've made.
Removed the usb cable and the USB socket on step-up converter and soldered everything together.
Then placed the step up converter inside the Mobius case and opened 2 holes to let the wires come out.
Now when I want to use the Mobius cam, just have to connect the lipo battery (or other between 3 to 5v) externally.

Just used it on my B17 last weekend !

Ruben
Nov 11, 2018, 05:24 AM
Keep Looking Up
BWX232's Avatar
If you ever wondered how long brand new 820 mah batteries compare to old used up 820 mah batteries, I did a test.
Two brand new batteries on their first charge in the two C2 lens mobius cams on top of vid and a heavily used 3 year old batt in the A2 lens on the bottom left of pic. I let them run all the way out in this (4K) video. Results and info about testing in video description and at beginning and end of video.

Mobius Action Cam Brand New 820 mAh Battery Test vs Old Battery (2 hr 40 min 1 sec)
Last edited by BWX232; Nov 15, 2018 at 05:32 PM.


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