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I figured out what got burnt. I had to use a magnifying glass and see it outside in sunlight to see the burnt material. There is a regulator LM 2576H and a diode SS310. The diode is burnt and the legs around LM2576 has burn marks on the PCB around the 1st and 2nd legs. Most probably the diode...

I had one of my two V3 mono failed today. It happened right in front of me. Suddenly there was a kind of a crackling sound from inside and white smoke came out of the right side vents. There was a peculiar smell that filled the air. Speakers were connected. I immediately jumped and switched off...

Here are the images One of the capacitor looks strange. Is that Cap just next to some 3 legged chip OK? It is just in front of the 2200 uF capacitor. Also the smell is strongest in that region. Here are other images Image of the backside. Doesn't look anything burnt here

One of my Fosi v3 Mono suddenly started making some sizzling sound inside like how you fry eggs on a pan. Wispy white smoke started coming from the right vent. I was not playing anything. I had just switched it on and was making a playlist to be played. Jumped and quickly turned off the power...

I couldn't make out anything from the video. The switching between the opamps are distant apart (many seconds) and hence I just cannot make out. If at all such a test should make sense, the A/B switching should be instantaneous back and forth. I doubt we human beings can retain a sound signature...

Any reason you assume that you are using pulseaudio? You can temporarily disable pulseaudio Which volume control are you talking about? The volume control on cantata will work for ALSA too. The OS volume control (which controls the pulseaudio volume) will not work. In /etc/pulse/client.conf...

When you say toslink, do you have another device which outputs audio via SPDIF/TOSLINK? Look at the output of aplay -l and have that device added in mpd.conf. Once you add a device, the same will be available as a select box in cantata under "outputs" e.g. This is the mpd.conf on my laptop...

I stumbled on this post while searching if I could turn on the 'bit perfect led' in my Asus Xonar Essence One Dac which shares many features with the DAC which the OP has. The led has actually nothting to do with 'bit perfect' it is just turned on when you use the ASIO driver on windows. Now to...