Question about Panasonic Toughbook CF-51 Notebook
Computer will suddenly turn off when cooling fan starts. sometimes it must be restarted 3 or 4 times before it will complete loggon.
Your best hope is that the CPU heatsink is dusty and the CPU is overheating and therefore shutting of for thermal protection.
Try to clean it deeply with canned air caring not to short the fan speed sensing with the condense caused by the expanding air(do not hold the nozzle too close to the fan).
If it keeps doing it, then it's probably because of the motherboard's voltage regulator and you need to replace the motherboard or at least the voltage regulator if it is not on-board(usually it is onboard.)
Posted on Feb 14, 2009
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