fwiw YouTube has an experimental “Ask about this video” button. This is the verbatim output:

Here's a summary:

• The charger was donated by a viewer and stopped working despite seemingly good construction. 0:02

• It has two USB-C ports (100W each) and one USB-A port (12V, 22.5W). 0:25

• When plugged in, none of the ports output voltage. 1:00

• The outer box is filled with resin, making it difficult to open. 1:10

• Open, the charger reveals several circuit boards in a sandwich-like design. 2:57

• A shorted rectifier bridge (3:49) and a shorted capacitor on the USB-C output control circuitry (7:20) were initially suspected. 3:49, 7:20

• Further investigation with a thermal camera pinpointed a specific communication/voltage conversion chip as the source of the short. 13:11

• This chip controls the gate of the MOSFETs used in the synchronous rectifiers and DC-DC converters. 14:00

• The main transformer is a hybrid flyback design with a unique AC input and half-bridge rectifier. 17:15

• The short was traced to the capacitor's pins on the same side of the board, suggesting a potential multi-layer board issue. 12:19, 12:41

• The video ends with a cross-section view of the transformer and measurements of some donated 18650 battery cells. 18:46, 20:35

Essentially, the video demonstrates a complex charging circuit and troubleshooting process, highlighting the potential for multiple failure points in high-power chargers.

In this case, I think the interesting part is the video itself / the process. He breaks down a very inaccessible product and explains how it all works.

This video dives deep into a faulty 120W GaN charger, exploring its intricate design and uncovering the source of the failure. The video details the process of disassembling the charger, revealing its complex circuitry and identifying various components like the GaN transistors and the printed transformer. The investigation concludes with a surprising discovery about the cause of the malfunction.