Hi all !

I need help about my MinimOSD freshly unpacked.

I've triple checked the cabling and I don't know why I've just a black image on my screen.
There is a suspicious comportement when I power on the system. I explain how it happens:
1. Connect correctly the Vin/Vout/RX/BLK between APM, MinimOSD and video transmitter 
2. Power on the APM 
3. Connect the battery balance connector 12V to the MinimOSD  

At point 2, the ST led (orange) blink and the D PWR (red) led power on and still.  
When I do the point 3, the ST led shut off and the A PWR led power on and still. 
After that, I just have a black screen... It's weird because the system worked at least once!  
The firmware is up to date and I use a XBee but I've not connected the TX port on the minimOSD.

What's wrong ? Someone can help me ?

Thanks in advance ;-)


Views: 32314

Reply to This

Replies to This Discussion

Ahh!!!!, I have 0.1....FIUUU!!! I've just save my minim Thank's!!! :)

I have a jdrones 1.0 board which should have the switching regulator and have had no problems with it. I use a 4s battery for everything and power my apm1 with 5v 10a reg from castle creations and since my Pixim camera requires more than 5v I have a second castle 10a reg that I changed to output 9v. Even though I'm using one battery for all I guess my grounds are isolated because I've never had this problem of black screen. On the video side I have all 4 wires connected. Video in out and +- also.

Does anyone know if I could do the same thing with the dc-dc buck converter. The castles are really overpriced in comparison!

MinimOSD needs two powersources. One which is +5V

Hmm I don't know what happened to my earlier message so here goes again, I hope that it will come trough fully now.

MinimOSD has two power areas, one digital and one analog. Digital area is normally powered directly from APM and with +5V (4 pin telemetry cable). Analog side can be powered from battery directly. If your board have switching regulator, you can power it from 2-6S LiPos easily. If you don't have switching regulator then maximum power is around 3S LiPo. 

jDrones miniOSD's have always been having switching regulator. Goodluckbuy etc do not have as they are using old design. 

How to know if you have or not have switching regulator. Look top right corner of your OSD on above of Video IN/OUT pins, if you only have one small IC there and a lot of space around it.. You don't have switching regulator, but if you have a lot of components and especially one square components with white sticker on it, Yes in this case you do have switching regulator and you are free to use 2-6S LiPo's

Using one power source only, there are small solder jumpers on board that can connect analog and digital areas together and this way use only one power source. One jumper is on Bottom of the PCB (around middle, on jDrones board it is just above letters "ro") and another jumper is on Top side of the PCB between those small resistors/capasitors under square MAX7456 Video IC.

IF you connect these two jumpers, then you only need to provide one power source from Video PINs area. Also if you connect these jumpers, do NOT connect +5V from APM. I say NOT just in case, nothing bad will happen but if you have another switching regulator powering APM you might have power conflicts and that can cause crashes.

Reason to have two sources is that some systems don't like that we mix analog and digital power sources together, 

We 2S users, don't worry we use a lot of 2S LiPos to power up our OSDs while doing testing and other things, only bottom silk says +12 on Video PINs area.

Jani do you see anything wrong with the way I set it up? I've never had the black screen problem but after reading these posts I want to make sure I don't have the problem :) are my grounds isolated because I'm using switching reg to power apm and another to power video side of OSD because I use 4S so can't power video side directly with that so I use second 9v switching reg just for that.

@F11, nope i don't see any problems. Your grounds are isolated as long as you have 2 separate batteries and you don't use any common ground in anywhere. Joining grounds usually don't cause problems but if you join power planes on OSD and you have +5V coming from APM too.. then you might have some problems in generally. 

As said, you can either use 2 separate power systems or 1 but in this case do not connect +5V from APM/Telemetry port. 

Jani, I'm just using ONE battery, 4S but I'm using 2 castle 10A regulators. One set to 5v for APM and one set for 9V for camera and video side of OSD.


Please don't isolate the grounds.  This is what kills the MAX chip, causing the MinimOSD go blank.  The specs for the MAX chip call for the digital and analogue grounds to be kept very close (within about 0.3V, as I recall).  Without any transient suppression onboard, these voltages can vary by more than 0.3V when motors are started and stopped. 

It's safest to power the MinimOSD from the APM.  If you are having interference from your servos and/or motor, it's better to and an L/C filter (search on rcgroups for examples) than adding a second battery.  It will probably be lighter, too.  If you really need a second battery, do so, but tie the grounds together.  A little bit of noise in your video is better than a dead MinimOSD! 

There are various ways to hook up the minimOSD. Here is how I assemble and connect my minimOSDs, which I think is the safest (least likely to fry the OSD):

Before Assembly

Digital Pins Installed

Analogue Pins Soldered

Place a Solder Blob Here

And Another Here

Heat Shrink

Spare Pin Bent to U Shape

+12V Jumper on Connectors


Fete, looks like all your pictures are broken. Can you check their correct addresses. It might be that your picture provider blocks xross website picture shares. 

Thanks for the note.  They were flagged as hidden from outside my network.  Should be visible now...

Yes, thank's, I did the same and works :)

Reply to Discussion


© 2020   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service