ReplayTV 5XXX series
There are at least two versions of motherboards used in 50XX and 55XX series ReplayTVs. Early 50XX models use a version 5 motherboard and the fan is not controlled by the motherboard. Later 50XX models use a version 7 motherboard and the fan is controlled by the motherboard (so it's quieter). 55XX ReplayTVs use either version 5 or 7 and the fan is controlled by the motherboard in either version. Note: even though the fan is controlled by the motherboard and runs at a lower speed than earlier models, it generally runs at one constant speed and is either on or off. As stated above, when the fan is controlled by the motherboard, it cannot be replaced by anything other than an identical model to the OEM fan. Any other fan will result in a "fan lock detected" error message. Here are some pictures of the different motherboard versions. For all intents and purposes they look the same.
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