sry for double
but i have a question
my fiio has scratching sound when adjusting volume on the right channel, specially on bad recordings or low frequencies
it's not happening during playback, only when adjusting the volume
first i thought that it could be that the pot is dirty, so i tried to work it in by turning it full range numerous of times, slowly or fast, no help in that way
tried turning bass boost on or off, turning high / low gain, issue persists and scratching can be heard all the time when turning the pot
only thing i noticed, is that after 6, so from 6 to 8 in pot adjustment, scratching is less pronounced, less audible
today i disassembled my fiio to see if i can clean a pot somehow, but it looks like it's not possible since the screw which is holding the pot together, is going through the pcb, and the pcb for pot is glued in the main pcb, so opening the pot is impossible without risking the functionality of the device
but now i am more concerned about the solder residue on the bottom side of the pcb, could that be the potential problem for the scratching noise ??
would cleaning of the pcb, to get rid of the residue, be enough to eliminate the scratching noise, or is the main problem here dirty pot, in which case problem is not solvable (because of the explanation above)
what do you guys think, is there some other way in which i could try to eliminate that problem ??
i have added photos of the pcb so that you can see how it looks, top side looks nice, no complaints there, but the bottom side is what is bothering me now
tried the fiio on gf laptop, on iem-s, with other headphones, to see if the issue would be gone, but no, scratching can be heard in all situations
i tried to hook up my dt770 directly to laptop to see if maybe problem is in them, they work normally with onboard audio, so that confirmed me that it's device fault
any help will be appreciated