Can someone help me identify these tiny surface mount components on a circuit board?

[fuzzybabybunny]

https://fuzzybabybunny.smugmug.com/Westone-W60-Teardown/

What is the black block with an "A"? I'm assuming that the tan block to the right of the red wire's upper solder point is a capacitor?

These photos are of a Westone W60 in-ear-monitor. They developed an audio balance issue after dropping my Microsoft Surface while it was hooked up to my DragonFly Red DAC and playing music. The right side volume suddenly became lower than the left, requiring an extra 6dB to compensate.

Measuring the internal resistance at the MMCX port, the right side is 15.60 ohms while the left side is 15.16 ohms, so I think that explains why the right is lower in volume than the left. Normally IEMs have the same internal resistance on both sides, to within +/- 0.02 ohms. Unfortunately, I have no idea why the internal resistance might have increased due to the drop. All drivers still sound fine.

Interestingly enough, there is barely any circuitry. The six drivers are wired in a simple series with a passive crossover consisting of those two surface mount components.

Rest of the photos:

 

[Sukhoi]

Yes the tan one is likely a capacitor, and you may have cracked it internally when you dropped it. But capacitors reduce resistance when cracked. Not sure about the black component. Probe all the individual solder joints as one of those may have cracked which would then raise the resistance. You can just reflow it to fix it.

 

[shortylickens]

Looks like square capacitors. Which are not common but still a thing.

 

[fuzzybabybunny]

Yes the tan one is likely a capacitor, and you may have cracked it internally when you dropped it. But capacitors reduce resistance when cracked. Not sure about the black component. Probe all the individual solder joints as one of those may have cracked which would then raise the resistance. You can just reflow it to fix it.

Actually now that I think about it, I don't think there was a fall. The DAC that it was attached to look exactly like a thumb drive. The Surface Tablet was squished inside of a bag and the DAC, which juts out of the USB port link a thumb drive, actually got bent at the port.

I'm thinking that bending the DAC while it was simultaneously attached to the computer and supplying voltage to the headphones somehow screwed up the headphones? Would over-voltage or over-current lead to a situation that increases the internal resistance of this earphone?

Sent from my SM-G900T using Tapatalk

 

[VashHT]

Black one just looks like a tantalum capacitor, they're polarized so that's why there's a white stripe on one side.

 

[snoopy7548]

The black component looks like an SMA/SMB-package Schottky diode to me, which makes sense considering the battery.

Or if one end connects to the green wire (I'm assuming that's protective ground), it could be a MOV.

EDIT: The MOV thing doesn't make sense. I'm sticking with Schottky.

 

[Murloc]

the black components has a direction, that's why it's got a strip on one side. The strip marks the cathode if it's a diode, or the + if it's a capacitor.

The tan component is a capacitor.

The impedance could change if you damaged the drivers as well imho.

 

[Thebobo]

Also The A could be a CI or and ID I looked booth up as component makers and found none. But it does look like a capacitor.