I wired up an Avatar 1s lite to TX/RX2 on a HM X12 v2.1 board. I set the VTX in BF to 0 power and enabled pit mode hoping to minimize interference from the analog . I also cut a small UFL wire to leave plugged into the board. When running on 2s I get video but even a slightly rough landing causes the board to reboot. I pulled it all apart and rebuilt it with extra vibration damping between the boards and double checked to make sure nothing was loose. All good. 

Can this be done properly, or at all? I think disabling the VTX altogether would be best, but I'm not sure if that is possible. 

Thanks

If you're connecting an HD VTX to the Happymodel X12 FC which has an onboard analogue VTX you need to disable power to the onboard VTX by removing the "Onboard VTX Power Bridge". You can see the location in the pinout of the image below and also a photo of an X12 FC with that bridge already removed...

(07-Feb-2023, 05:14 PM)SnowLeopardFPV Wrote: If you're connecting an HD VTX to the Happymodel X12 FC which has an onboard analogue VTX you need to disable power to the onboard VTX by removing the "Onboard VTX Power Bridge". You can see the location in the pinout of the image below and also a photo of an X12 FC with that bridge already removed...

This seems to have done it. Thanks. I plugged it in and left it for a while. It got slightly warm, but nothing like before. As for the avatar, does it matter which 5v I use? Are some better regulated, or do you think the issue was that the vtx was powered?

Thanks again

Unfortunately I can find ZERO information on the current rating for the onboard BEC of the Happymodel X12 AIO FC. You can use any 5V pad but be aware that even the 1S Walksnail Avatar VTX draws a lot of current so just be careful what power output you set it to. If you try to use 350mW there is a good chance that you will run into brownout issues with the VTX where it can't get enough current from the FC and will just shut down as a result which is something you really don't want happening mid-flight. Make sure you do plenty of testing at close proximity where you will be able to retrieve your quad before you put your full trust in it.

If it's anything like the Crazybee 2.1's regulator, it might not even be a full 1 amp.

(08-Feb-2023, 01:57 AM)SnowLeopardFPV Wrote: Unfortunately I can find ZERO information on the current rating for the onboard BEC of the Happymodel X12 AIO FC. You can use any 5V pad but be aware that even the 1S Walksnail Avatar VTX draws a lot of current so just be careful what power output you set it to. If you try to use 350mW there is a good chance that you will run into brownout issues with the VTX where it can't get enough current from the FC and will just shut down as a result which is something you really don't want happening mid-flight. Make sure you do plenty of testing at close proximity where you will be able to retrieve your quad before you put your full trust in it.

This is interesting. I had just been flying a 1w VTX and my goggles were set to 700. I'm guessing that means the 1s would default to 350?? I'll try lowering this down and see how it goes.

Thanks

P.S. HM got back to me shortly after you did. This is what they said in regards to the on-board vtx.

"This would caused 5V BEC working incorrect . You need to disable the onboard VTX first. Then have some test ."

So it seems you definitely need to disable the VTX.

(08-Feb-2023, 03:03 AM)Suros Wrote: If it's anything like the Crazybee 2.1's regulator, it might not even be a full 1 amp.

That would be problematic. I knew going into this the X12 was not ideal for this, but I had it on-hand. The regulator made me think of something. I had a Mob7HD at one point that had a blackbox wired to it for gyro data. Turns out that BB recorder is also a voltage stabilizer for 5v. Seems the Runcam Split3 Lite wouldn't run on it without it. I wonder if I can use that with the Avatar.

Thanks