u/IlluZion2

I have a problem with my Ubiquiti UA-Intercom - it stopped working. After connecting to POE it does not start, the display is black and is not visible in the network. I assume internal damage. The intercom is no longer under warranty. If you have not yet seen the intercom from the inside, I am attaching photos.

Diagnostics:

- After connecting to a Mikrotik switch with POE, the correct voltage is negotiated and a small current consumption is displayed (Voltage 53.0V, Current 29mA, Power 1.5W) (1.5 watt is too low for this device)

- When checking with a thermal camera, it is visible that three components on the motherboard are heating up when powered on (see photos).

- One resistor (PR6) is heating up (40C) and has very low ohms - multimeter measurement showed 10Ω (see photos) - this is basically a short circuit.

- According to the datasheet of the MP8009 chip, the PR6 resistor is connected to pin 15, which is GATE - Main MOSFET gate driver pin. I am not sure if the resistor has correct value of 10Ω there. (https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP8009GV-Z/document_id/4873/)

Does anyone have this intercom available to confirm the capacitor and resistor readings or any other suggestions?

Thank you :)

Hello everyone,

I’m having an issue with my Intel NUC13. When I connect the power supply, the green LED inside the unit turns on, but the NUC will not power on. The power button does not light up, and the fan does not spin. I tested the power supply, and it outputs the correct 20V.

Using a thermal camera, I found one component on the motherboard that heats up immediately after power is connected. It is located on the CPU/fan side of the board, near one of the mounting holes and close to the P172 2x2 4-pin connector. The component quickly reaches about 70°C.

Under a microscope, the component appears to have a small bump on it, so I suspect it may be damaged. I have attached photos of the area.

Can anyone help identify this component or suggest what I should check next? Searching online for the markings/location did not give me any useful results.

Thank you in advance.

Hello everyone,

I’m having an issue with my Intel NUC13. When I connect the power supply, the green LED inside the unit turns on, but the NUC will not power on. The power button does not light up, and the fan does not spin. I tested the power supply, and it outputs the correct 20V.

Using a thermal camera, I found one component on the motherboard that heats up immediately after power is connected. It is located on the CPU/fan side of the board, near one of the mounting holes and close to the P172 2x2 4-pin connector. The component quickly reaches about 70°C.

Under a microscope, the component appears to have a small bump on it, so I suspect it may be damaged. I have attached photos of the area.

Can anyone help identify this component or suggest what I should check next? Searching online for the markings/location did not give me any useful results.

Thank you in advance.