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enter image description here

Everybody can help me identify this device in red circle.

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The mark only tells that it's a unidirectional component at first. Most of the time that means a diode of any type - not telling about the type of diode.

Could be small signal switching diode or a Zener or a TVS. You could desolder and measure a bit, or follow the traces to understand the schematic better.

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Judging from the symbol underneath the device it's a diode.

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    \$\begingroup\$ D5 looks ... interesting. \$\endgroup\$
    – greybeard
    Commented Jul 10, 2023 at 6:55
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Could be a TVS diode, hard to say without any more information. If right leg is going to GND, I'd say 85 % that is TVS or Zener diode.

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