Color Kit Grande Diagnostic

Step 1 of 6

Before you begin

This is an advanced hardware diagnostic tool. It tests display pins by asking you to place a temporary loopback jumper.

Power off the device and disconnect both display ribbon cables before loopback tests.

Never connect or move a jumper while plugging in USB or resetting the board.

GPIO2 and GPIO15 are boot strapping pins. Only connect their jumpers when this wizard asks, and remove them before reset or power-up.

Step 2 of 6 · Optional

Install the test firmware

Flash the bundled diagnostic firmware now, or continue if the correct firmware is already installed.

Disconnect both display ribbon cables and remove every jumper before flashing. The board will reset several times while entering and leaving its bootloader.

Loading firmware package…

I have disconnected both ribbon cables and removed all jumpers.

Step 3 of 6

Connect the diagnostic firmware

Connect the ESP32 by USB, then choose its serial port. The wizard uses 115200 baud.

Step 4 of 6

Prepare the board

Power off the device, disconnect both display ribbon cables, then reconnect USB.

Do not attach a jumper during power-up or reset.

I have disconnected both ribbon cables.

Step 5 of 6

Loopback test

Connect to MISO / IO19 with one jumper wire.

Step 6 of 6

Test the MISO input

Remove the loopback jumper.
Connect MISO / IO19 to GND.
Run the test, then remove the jumper.

Diagnostic report

Test summary

Pin	GPIO	Result	Failures / checks

Diagnostic wizard