I couldn't even get Tivo to give me the audio level and impedance specs for a unit so I'm sure a schematic is out of the question. You might e-mail WeaKnees and DVRUpgrade to ask about repair costs. I'd also check with Tivo about the cost for a replacement. Seems like others have posted a number around $150 from Tivo for that service (includes transfer of the lifetime to the replacement box). The S2DT might be worth paying to get repaired but I suspect that the other one isn't.Hello, I am currently recapping some old Audio equiptment and thought I'd try to resurrect 2 Tivos with lifetime service. The issue that took the 2 Tivos out of service was loss of audio on both units after lighting took out our phone service. Picture & functions seemed intact, just no audio. After cracking open the case, I have found the same resistors fried just off the phone input jack. (see photo). I don't see any other signs of failure & don't know if this area would even effect the audio. I haven't found any schematics to give me resistor values, so I'm stuck. I'm no electronic engineer, but if this can be fixed, I'd like to give it a shot.