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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    So I replaced the capacitors that I have circled here with new capacitors. Unfortunately it has done nothing to the sound issue. It still sounds the same. Also I am still able to measure 50V AC across these capacitors. Pls help
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    From what I have calculated, the replacement capacitors (even taking into account MOQs) cost much less than getting a decent ESR meter. I'm moderately good at soldering and have all the equipment needed for SMD soldering, should I just get the replacement capacitors? I was thinking this had to...
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    The model in the schematic and the board I have is the same but the numbering seems to be all off, I visually identified and figured out the step-down regulators. Also the class d amps are also different in that board. I wasn't able to find a line with 1.35V No regulator or similar components...
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

  5. S

    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    I do have the schematic of the board. The PSU is a separate board which receives mains and then outputs 23V DC. I have not seen any issues till now on that board, it looks fine. I asked another guy who has some experience with JBL boards, he said only the audio processing chip (ES8680FSB...
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    What do you think I should do now? I've found a place where I can buy these capacitors, should I replace those? Or does this seem more like a fault wit some IC which will be hard to source?
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    Hi, Is this corrosion from leakage? It was under the black glue that was on the board. Also, I have tried measuring the AC voltage across the capacitors, but is this value possible or am I doing something wrong? I am getting this across most of the capacitors.
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    Which MCU do you prefer — ESP32 / STM32 / RP2040 / Arduino?

    RP2040 comes in nice form-factor boards from ST electronics, so I prefer that for the compactness. It's very helpful cause I usually am using it in small model rockets where the payload space is really tiny.
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    JBL Bar 2.1 Mk2 making screeching sound when audio is played.

    I have a 2yr old JBL Bar 2.1 Mk2. It stopped working about 2–3 months ago and I've opened it up now to try to see what could be the problem. When playing any audio from any source, it creates a very loud screech sound from the speakers. I have attached a video of the same. It is only present...
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