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Trying to Repair an Enterprise-Grade Network Switch That Was Suspiciously Cheap

Updated: 12 Eyl 2026 · 1 min read · 111 words

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Trying to Repair an Enterprise-Grade Network Switch That Was Suspiciously Cheap
Disassembled circuit board on a repair bench

Juniper EX4100 quotes

When the seller asked for less than 10% of the $3,000 new price for the Juniper EX4100-F-12P switch in “untested” condition, [This Does Not Compute] pressed the purchase button and recorded the experience on video. The device arrived without a power adapter for its 48VDC input; upon examination, the voltage lines were found to be shorted.

PCB figures

Because of the 280-watt adapter, the upper section contained a large aluminum heatsink and a heat pipe. Inside, it was found that water ingress, rust, corrosion and some components exploding had damaged the PCB layers. With no schematic or repair support available, the device was found to be electronic waste.

Source: Hackaday