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Yes I know. The regulator isn't the problem. switched it and the problem is still the same. Need to know what exactly is broken to switch it.

The 3.3V has only 0.54V so the LED will not blink, even the blink sketch can be restored. the startUp process of the IMXRT stucks in step 4 (see post #1) Therefore i need to know which part is broken and i have to replace, to get the Teensy back to live.

Hi, no hot components. It draws only 28 µA. Normally it needs 65mA or more to run Yes it was connected to several components: 2 power supplies (1x 3,3V to vBat, 1x 3,3v to 3,3v rail to startup without 5V), I2C1 several components and a 4" display. It broke after loading up a new program by USB...

Hi all, my Teensy 4.1 is not longer starting, only connected to USB. Nothing else is connected. Measured all Voltages for the booting process (8 steps) but from step 4 the Voltages are to low or zero: 1) USB_VBUS = 5V 2) VDD_USB_CAP = 2,5V VDD_SNVS_IN = 2,3V 3) VDD_SNVS_CAP = 1,1V so far so...

Thanks great. The first 2 i've read, but I missed the one Paul gives the max (3rd thread).

Hi together, now searching for couple of hours for vBat specs voltage. I found many info how to connect a coin battery and some use 3.3v (LDO) and/or 3.6/3.7v...(LiPo) but nowhere found a real spec how much to put in vBat: minimum until it works secured and maximum to not break it/anything...