Foxeer 4K Ambarella A12
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This page is about the Foxeer digital camera, model Foxeer 4K Ambarella A12, manufactured and distributed by Foxeer here: https://www.foxeer.com/foxeer-4k-ambarella-a12-hd-camera-uav-pwm-remote-control-wifi-distortionless-lens-tv-out-micro-hdmi-g-220.
| Problem | Check | How to check | Solution |
|---|---|---|---|
| No power when pressing the power button | Is USB power present? | Measure voltage across the big diode (Dxx), on the main PCB, next to the microUSB port
Measure TP7 on the Power board: 5V (USB power) Measure voltage on Rxx (0 Ohms), next to the 32pin connector (VIN pins) on the main PCB |
Check for blown fuse or bad connectors. |
| Power for the ON/OFF switch is present?
Does the switch work? |
Measure voltage across the ON/OFF switch
Measure resistance of switch when pressed (should be <10 Ohms) Measure TP6 on the Power board: 3.1V |
Check cable and connector.
Replace switch. Check TP7 (5V), replace RT9992 DC-DC converter. | |
| A subsystem is not powered. | Are all DC-DC converters working? | TP5: 1.8V, TP2: 3.23V, TP3: 1V, TP10: 3V | Check all enable pins on RT9992 (also present on the 32pin connector, next to SDIO label).
Check output capacitors. Replace RT9992 DC-DC converter (QFN-32 package) |
| TP4: 3V | Replace DC-DC converter (WDFN-6L package) |
Useful information:[edit | edit source]
- Power is provided through the microUSB connector, goes to a Zenner diode (Dxx) for overvoltage protection, and then is transferred to the power board via 3 pins (labelled VIN).
- The power board is the bottom board of the stack. It receives 5V from the USB, and provides a continuous 3.1V for the power button.
- There are 2 DC-DC converters on the power board:
- The 16-pin connector is used only for Wi-Fi, and the camera turns on even if the connector is disconnected (i.e. is not properly seated).
Resources:[edit | edit source]
- x-ray view of the power board (see picture on the right)
- Richtek Tech RT9992ZQW datasheet
- Richtek Tech T8010A datasheet
