i have a device which can supports 4 cams to be connected to a dashcam and controlled by a remote switcher



the device works flawlessly capturing videos and switching between all cams but just one thing odd is the white banding lines it produced



some suggested me that to use something like picture below to eliminate interference but still no cure



just right before i'm giving up, i noticed something when i pulled out the power cable from the device just leaving some portion of it slightly inside the device, the white bandings vanished miraclely all of a sudden




but this didn't last long once i reinserted the cable deeper to fully into the device, the white bandings reappeared again.......

what could be possibly wrong happened here? or any solutions that you guys can be suggested for me to solve it? thx

This post has been edited by feimeng: May 1 2024, 09:44 PM

checked but the joint soldering seems fine，still shiny and even， didn't notice any oxidation/rust as well, just some smudges around the joints(seems like intended)

i did test in my room with router power adaptor but the lines were not there, weird

already ordered a new power cable see how thing goes
actually i already tried usb,obd also same result

This post has been edited by feimeng: May 4 2024, 10:39 PM

i first thought interference also, but ferrite bead does not help even i have already clipped four here and there and back and forth, no cure

actually my connection of dashcam and the device are of different sources also, dashcam lighter, this device obd, and another pendrive to usb

directly from batt you mean the fuse box is it?

not sure, it's not my field of expertise also
now waiting for the new power cable to see how thing going

i don't want to touch the fuse box as i'm not familiar with it
i tried with a power bank just now, surprisingly the lines are gone, but once i plug it back to my car usb port, appear again...
is this means that my car voltage got problem?

This post has been edited by feimeng: May 5 2024, 06:30 PM