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 ;-)
Jerome
Replies
What the, I just used this the other day, now I plug it up the same way and I get picture, then blank screen, The the picture flashes for a second and blank screen, I did not fry it as I just used it the same way... I can still read the values from it and save but I cannot get it to do any on screen just blank what gives?
do they just go bad? mine worked fine the last time I flew, now when I try it I get a black screen
Here's a better design by "DTF UHF", but they're not being produced or sold anywhere (yet):
http://fpvlab.com/forums/showthread.php?24144-KV-OSD&p=513294&a...
This is not correct: in the minim OSD the video_in and video_out are separate pins and they are not connected.
If the maxim chip is fried (or just not powered), you get no video signal at all.
I've already fried 7 MinimOSDs (original and clones) trying to get it to work on a single battery system AND without a ground loop.
Most people who've got it working on a single battery system do it by powering it from the APM, soldering the 2 tabs, and removing the 12V + connection. The problem with that is that there are 2 routes to ground.
Trying to achieve a star-ground, I removed the ground wire on the APM telemetry side.
My APM is powered via the power module and my video gear from the balance connector.
If I power my APM first and then the video gear, it all works.
If I power my video gear first and then my APM, then the MinimOSD fries.
I'm still confused as to why it's happening. It makes no sense to me at all. That's why I've already destroyed 7 in trying to figure it out.
I'm done with experimenting now, because it's becoming too costly. I've got more MinimOSDs coming in the mail and I'll just have to connect them with ground loops and pray for the best.
I just wish 3DR or someone would redesign this pos OSD so that it will be more reliable and not so noisy on UHF if powered by the video side, and most important of all dump that Maxim chip and replace it with something else.
I just created a diagram demonstrating what I wrote above.
At step 5, when you connect the Lipo with the balance connector, the analog part of OSD will be powered by the OSD regulator. Because the two solder tabs are bridged, this will also power the digital OSD part, AND the APM, AND the power module, and the ESC's ! This is too much consumption for the voltage regulator of the OSD -> it fries
Thanks for trying it too and for the advice. I suppose it was a spike then. I couldn't believe it either, that's why I fried a few boards retrying it. I used a PZ0420 camera, and either a Boscam 200mw 5.8Ghz or Fox 800mw 1.3Ghz VTX (can't remember which of the 2).
On my next setup, I'll do use only a video line on the video side of the OSD, and I'm going to power everything simultaneously after the power module (not using the balance connector anymore).
It's simple: Do as I explained and with everything connected to the right pins of course.
Because like I said "The problem with that is that there are 2 routes to ground."
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