Take a peek at what powers those popping pixels:

Texas Instruments SN74LVC8T245 8-bit dual-supply bus transceiver

Texas Instruments BUF16821 programmable gamma-voltage generator and Vcom calibrator

Parade Technologies DP665 LCD timing controller (the same found in the last generation iMac 4K)

We assume this is an Apple modified version of the DP663

Texas Instruments TPS54218 4.5 V to 17 V input, 2 A synchronous step-down SWIFT converter

Texas Instruments TPS54320 4.5 V to 17 V input, 3 A synchronous Step-Down SWIFT converter

Texas Instruments TPS65168 high resolution, fully programmable LCD bias