载板上没有电源按钮，是自动上电，当给上电时，当TX2有时候无法启动，串口没有任何信息打印，当这种情况发生后，按复位按钮就能正常启动。TX2没有启动时，TX2给载板的信号CARRIER_PWR_ON是高电平，载板是能正常上电。
附件图片是12V电源与VIN_PWR_BAD信号时序，12V电源与CHARGER_PRSNT信号时序。
Hi sunchengxiang,
Welcome to Jetson & Embedded Systems forum, please open issue with English manner then other developers can know your issue to share their experiences.
Translated by Google:
There is no power button on the carrier board and it is automatically powered on. When power is turned on, sometimes the TX2 cannot be started, and the serial port does not print any information. When this happens, press the reset button to start normally. When TX2 is not started, the signal CARRIER_PWR_ON from TX2 to the carrier board is high and the carrier board can be powered on normally.
The attached picture shows the timing of 12V power supply and VIN_PWR_BAD signal, and the timing of 12V power supply and CHARGER_PRSNT signal.
Assume you are talking about your custom carrier board. Did you check the items in checklist in OEM DG one by one? Did you follow the power part design guide in OEM DG? What’s the difference between your power design and dev kit reference design?
We designed the carrier board according to OEM DG. 2 of the 50 carrier boards cannot be started normally. About 50 times of power-on startup, there will be 1 power-on startup failure. Observing the VIN_PWR_BAD signal and CHARGER_PRSNT signal with an oscilloscope is exactly the same as the normal startup. So I don’t know where else to check the circuit. When the power-on fails, TX2 can output CARRIER_PWR_ON signal to power the carrier board.
Did you check the items in checklist in OEM DG one by one? Did you follow the power part design guide in OEM DG? What’s the difference between your power design and dev kit reference design?
In addition, please check the strapping pins settings as said in OEM DG. Those pins’ status should not be changed during power on.
If the failure only happens on this 2 boards, then it might be a single failure case. It might be caused by the soldering quality or component issue of the 2 boards.
Strapping Pins:
The level conversion chip TXB0108PWR has no pull-up and pull-down resistors inside, and the other Strapping Pins are left floating.
If the failure only happens on this 2 boards, then it might be a single failure case. It might be caused by the soldering quality or component issue of the 2 boards.
Please check your board soldering and components.
Every time we shut down the ubuntu system, it is powered off and shut down. Does this affect the restart of TX2?
Please check your board soldering and components.
If you could reproduce this issue with Nvidia’s carrier board.