It marked 3B=3H what ic is this?and does any have compatible replacement?thanks in advance
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Hi. I need help from wiser guys. I am amateur in electronics and can't figure this out by myself.
I bought faulty speakers, M-Audio AV40's. Other speaker has all the electronics in it and the other speaker is just passive one powered by the other speaker's amp. Original problem with the speakers was loud buzzing. I figured out that there is something wrong with the capacitors. I went ahead and replaced every electrolytic capacitor on the PCB. The caps are good quality and have the same values as the original ones.
After replacing the caps I started testing out the speaker. It seemed...09-10-2025, 10:20 AM -
I wonder if anyone can help a newbie, I have a Qnap TS-130 that is totally dead. The component marked U3 in the photo seems to be shorted but I am havin trouble identifying it.
Anyone able to help please? -
Hello,
I’m trying to repair a Lucky Miner LV06 Bitcoin miner that was given to me.
It looks like someone plugged 12 V into the 5 V rail and fried the three small adjustable regulators.
Each regulator is a SOT-23-5 package, all marked “BFCV.” I can’t find any datasheet or reference to that code. The regulators appear to generate 3.3 V (for ESP32), 1.8 V, and ~0.8 V (for the BM1366 ASICs), set by resistor dividers?.
From tracing the PCB:
Pin 1 (red) → 5 V in
Pin 2 > GND
Pin 3 (yellow) > output ... -
Hi:
I have what it might seem a zener diode. It's marked as E57, but I haven't found any reference that might match my observations.
I've took one from the same circuit and tested isolated with the power supply and a 1k resistor. with 10V, the possible zener stays at 6.6V.
It seems a SOD123 package. It measures (2.6mm x 1.6 mm).
Any idea? it's a 6.6V zener?
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Hello,
Device: PocketBook InkPad 3
Mainboard: XRZ_E091_PB740-VTTOA-V1.1 / 2017-10-12
I'm replacing the broken microUSB connector on this e-reader, and during inspection after desoldering, I noticed a loose black SMD component marked "CT". One of them was torn off along with the pad, while the other one (marked in the photo) is still in place.
I would appreciate help identifying this component.
Measuring the loose component with a multimeter gives 5.84 MΩ in both directions, while the one still on the board shows no measurable...
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