[Wrover Kit v4.1] The display doesn't display anything when the SD Card is inserted.

[C47D]

When the SD Card is inserted into the SD Card holder of the Wrover Kit v4.1, the display doesn't show anything.

This is because the Card Detect (CD) signal is connected to the IO_21 pin, R168 is pulling the IO_21 pin high (to VDD33) and R167 is connected in series between the CD signal and IO_21.
IO_21 is also connected to the D/C signal of the display, so the display D/C pin always gets a logic high, the display controller thinks it's always getting data and no commands.

To solve the issue I removed both R167 and R168, this have the caveat of not being able to detect when the SD Card is inserted on the holder, at least not without soldering a jumper wire connecting the CD signal from the SD Card holder to an unused IO of the ESP32 chip.

[mattiaVDM]

You just saved me after hours of debugging, i had the same issue. Removing the SD and it finally worked.