The previous models of the Raspberry Pi used different circuits to connect its 5 V power rail to the HDMI connector, i.e. How much current can I draw from each model's HDMI socket?

Especially the latest Pi 3B+ uses a RT9741CGV High-side power switch.

The Pi 4's schematics does not show something equivalent, i.e. 5V_HDMI is only listed as being connected to the HDMI connectors without revealing the respective power circuit.

The Foundations blog shows the part of the PCB (picture):

enter image description here

What is the function of the ICs labelled "BV=92R" and "JGJ 851" with respect to the HDMI ports?

  • quite possibly D4 – jsotola Jun 25 '19 at 23:49
  • @Ghanima, I googled and found "BV=" belongs to a manufacturer but could not find the full top marking code "BV=92R", I guess it is specially manufactured only for Rpi, therefore this internal use code is not published. And I guess this 3 leg guy is for Rpi to supply 5V power source to HDMI monitor, through connector pin18. TI has an app report for this: HDMI 5V Source Requirement - Application Report, TI April 2013 ( ti.com/lit/an/snva412a/snva412a.pdf ) – tlfong01 Jul 1 '19 at 9:14

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