I am making a board now, but the welding was unsuccessful after proofing. I don’t know where the problem lies. I would like to ask for paid help to find out the reason!
Board functions:
1. PD protocol deception, using CH224k, this part is normal
2.20v to 5v, using TPS5454DDRA, no 5v output
3. Audio power amplifier, this part is normal
4. The USB hub uses fe2.1 and is also wired according to the 90ohm impedance difference. After soldering, there is no response when plugged into the computer.
5. SD card reader, because the USB hub is not normal, there is no test.
6. usb to ttl, because the usbhub is not normal, there is no test
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