Hi all, i just starting this hobby, so i decided bought a second hand cinelog35 analog and i tested for a few flight it's fine except the VTX, it keep losing image in short range, so i disassemble and found out the VTX connector from FC is bending towards to other pin, after fixing the bending pin i clean the FC with brush, I plug in the battery it sound normal (beep beep beepp, beeep beeep) but i heard a humming noise, high pitch sound, buzzing noise, but everything seems normal, i test the motor, the VTX and beeper.
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I also unsolder the vtx cable it still the same, the noise sound still there

did anyone have this problem before ?
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I'm using geprc f722 aio 45a, here i attached the board
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the sound is exactly like on this video
https://youtu.be/Mj9gDvPj0L8?t=54

I just put a reply in your other thread for the same problem at the link below...

https://intofpv.com/t-need-help-fixing-b...#pid202910