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Fan polarity reverse and short-circuit protection prevent damage to the tester during faultfinding
the CB4 V10 control board is the most likely culprit
Replacing the failed chip with a new KF1960 and reflowing with fresh solder paste restores normal operation
Sourcing note: the CVFD20065A is officially obsolete at Wolfspeed (production discontinued) and no longer manufactured
When the board fails — capacitor pop
S19jpro Hashboard Tin Tool for Thermal paste application z15 Fan polarity reverse and short-circuitS19j Pro Hashboard Thermal Paste Stencil BM1362 Heatsink Application Tool Apply thermal compound perfectly every time with this precision stencil designed for the Antminer S19j Pro hash board. The tool exposes only the BM1362 ASIC chip tops while masking all surrounding components capacitors, resistors, and traces so thermal grease goes exactly where it is needed and nowhere else. It is essential for heatsink upgrades, water cooling conversions, and
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