Uploaded August 2025 | Updated September 2026, 1 week ago

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Analyzing a 24V 40A 960W QS40 Puls Dimension switching power supply module that failed with a loud bang. What's inside, what exploded in it and a simplified schematic with explanation. Testing some components - a fuse, power transistors, BJTs, MOSFETs, diodes, a bridge rectifier, electrolytic capacitors, ... A very odd active power factor correction (PFC)! The repair will continue in the next episode.

The next episode:
youtu.be/TEvVuicv8oM

The multimeter:
fnirsi.com/products/dmt-99?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

The internal resistance tester:
fnirsi.com/products/hrm-10?sca_ref=9216013.ntkg5GeG0R&utm_source=af&utm_medium=ref&utm_campaign=9216013

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