Common Errors when you are starting with raspberry pi 4
This is a list of the most common issues and the solutions for when you start working with a raspberry pi 4.
You probably are thinking should be easy and shouldn't have any issue since does not come with any manual or details of how to connect… the raspberry pi doesn't have a turn on/off button so even on the first step you will feel like probably I am going to break it, burn it, wreck it, etc… however, the truth is that is well built and you will have a lot of misses and nothing is going to happen and you will look on the internet why or what you should see like the RGB screen when is loading.
The first thing that you will see if everything is ok is the RGB screen or the coloured background on the screen, if you connect the HDMI then probably the connectors and the cables are connected correctly however you could have issues with the image not loading (Linux image or Windows image).
The titles describe the issue in short words with the reason why they are failing.
USB-C Power Problems stop or break the Linux load
The first issue if you see the Linux Image not loading is because the voltage is not enough, the image will not say anything about why is not loading and is going to return an issue however you will not understand that is a power supply issue from the error that is returning.
In summary, the problems were caused by a faulty design on the Raspberry Pi 4 board itself. The designers of the power circuit didn’t follow the standard, and instead omitted a resistor. This caused some more intelligent power supplies to mistake the connected computer for an audio device. It’s worth mentioning that the official Raspberry Pi USB power supply was never affected.
So if you have problems seeing the RGB screen is because probably is turning off after detecting that there is not enough voltage, the easy solution is to purchase a Raspberry Pi USB power supply or something that have the specific 5.1 volts
Hdmi and CPU Fan not connected in the correct place
The position of some connectors are not very well described and you could have connected the HDMI adapter on the wrong spot, is something simple but you need to be sure that the HDMI adapter is working you could have seen the two slots for the micro HDMI.
The correct place for the adapter of micro HDMI to HDMI that is coming with the raspberry pi 4 is the one that is close to the USB-C and the slot for the CPU Fan should be red black .
The Size of the SD Card is not been recognized
You need to understand how the Pi OS is installed.
The engineer at the RPF does the installation on his Pi. He then makes a copy of his raw disk, and places the copy into a “.img” file.
This copy includes everything, the partition table, all the formatting etc. It is an “image” of the engineer’s disk.
Finally, it is compressed to a zip file.
You then download and unzip the .img file.
The .img file is then simply copied to your raw disk, completely overwriting anything already on it, including any formatting you may have done.
There are various “imaging” tools available to do this copy (on Linux, a simple “cp” (copy) command is enough).
Therefore if you waste your time formatting your SD card first, you have just worn the SD card out a little — for no purpose.
I repeat, any formatting you do is overwritten and lost.
The .img file contains two partitions, one tiny boot partition which is always FAT32, and the main OS partition which is formatted as ext4.
The image on the SD Card is not loading
sometimes the image is not created correctly or the version of the image for the raspberry pi is not the correct version for the device, you need to recreate the device in other words reformat your sd card with the image.
this is a common mistake on Jet nano because the device can be of 8g or 4g and the image that is for the 8g is the second one on the page and you have to expand for example.
if you see errors like this
Recover4.elf not found (6)
Recovery.elf not found (6)
Start4.elf not found (6)
Start.elf not found (6)Firmware not found
Error 00000004
The SD-Card is actually inserted and boots with no problem. To solve above all you have to do is remove power to the board and apply power again (without touching the SD-Card) and should boot fine.
This type of problem is seen after you do ‘reboot’ from cmd line. There is a driver or some race condition that causes above in soft reboots.
This is a frequent issue however sometimes shows at the beginning of your run so you think something is wrong the best approach is to recreate your boot image.
Conclusion
Raspberry PI is a cool microcomputer to test things like lighting network or play with Linux however we can look at other devices like Jet nano for Machine learning and things may be more complex or more complicated however the raspberry is a lot more flexible and has more adoption.
If you have any questions you can ping me about and we can search for the solution and the new issue will be added to the list .
