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H520 with E90 beep code issue?

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Mar 22, 2021
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I have a Yuneec h520 with an E90.

When I start the drone, sometimes my E90 does not properly initialize. I do say sometimes, because there are times when the camera initializes properly and is fully functional (this boggles my mind)! However, when it does not work, it just beeps 4 times, then 3 short quick beeps. Then the beep sequence repeats. While it does this, the drone starts normally, I can even fly the drone. I have connectivity to the camera, just no control over the gimbal itself. I did some searching on the forums and some found that it was a faulty IMU, though there wasn't much documentation I can find on this. I am clueless when it comes to what the IMU module is or where it is to see if its damaged. Also, I am out of other ideas to try to figure this out. Does anyone have any pointers, suggestions, or knowledge when it comes to this issue?

I am willing to try practically everything, so please I am all ears!
 
Last edited:
I have a Yuneec h520 with an E90.

When I start the drone, sometimes my E90 does not properly initialize. I do say sometimes, because there are times when the camera initializes properly and is fully functional (this boggles my mind)! However, when it does not work, it just beeps 4 times, then 3 short quick beeps. Then the beep sequence repeats. While it does this, the drone starts normally, I can even fly the drone. I have connectivity to the camera, just no control over the gimbal itself. I did some searching on the forums and some found that it was a faulty IMU, though there wasn't much documentation I can find on this. I am clueless when it comes to what the IMU module is or where it is to see if its damaged. Also, I am out of other ideas to try to figure this out. Does anyone have any pointers, suggestions, or knowledge when it comes to this issue?

I am willing to try practically everything, so please I am all ears!
You are correct that the code is related to the IMU but it is not likely the IMU is actually the problem. The on/off feature of your description sounds like the issue is the far more common failure somewhere in the communication between the IMU and the gimbal board. The IMU is located in the camera ball just under the lens. The gimbal board is located in the rear arm of the gimbal. The communication includes a short piece of actual cable, several connectors, and two highly vulnerable "flexible circuity boards" (Ribbon conductors). The ribbons are easily damaged by things like compass calibrations or travel with the camera mounted and not secured by the gimbal lock. Any hard landing, sharp jolt can lead to damage.
The ribbons are almost never available. They are also pretty hard to change without doing additional damage. Sometimes the repair shops can help.
You may want to contact one of the Forum Sponsors that do camera repairs.
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