Hello all,
let me get this straight:
- have no live cisco contract, no TAC case etc.
- device used for private home use, not revenue generating, bought used on ebay, plan to use it for some more years before scrapping it
So I have a WS-C2960G-24TC-L, bought from a seller from a datacenter upgrade. Run initially IOS 12.x latest. I upgraded it to 15.0(2)SE11, but seems my pain has nothing to do with any particular IOS version.
When switch starts up, seems 100% perfect, fan works at acceptable noise level. But after a couple of minutes, the fan goes to full speed. After some minutes, fan goes down to normal speed. Then after a couple of minutes, fan goes up to full speed, and this keeps repeating forever. Environment is 18-20C degree, completely normal (some would say even cool) room temperature.
- Show env all gives: FAN ok, TEMP ok.
- Show log gives nothing about TEMP or FAN
- show tech: no idea what to look for in this
Debug: I have no clue what component to debug, as I couldnt find anything that remotely says like debug TEMP or FAN, most probably for a reason. Debugging ALL would be plain insane, right?
I am suspecting this is clearly a hardware defect. Just not sure what to check or solder on the mainboard? Thermal sensor faulty? Fan RPM reading broken? Fan 3-wires seem in perfect shape.
Has anybody experienced similar FAN crazyness, either on the same switch family, or on similar devices? Was there any solution apart from throwing the whole thing into the junk?
