A Note About Overheating and the Back Panel

The following is from another Klipsch owner and their experience

  This visitor was experiencing the problem of the main fuse burning out immediately upon turning the main power switch on. After some disconnecting and testing it was determined that the transformer was operating normally. This lead to the suspicion that there was a short circuit somewhere in the main power board.

Klipsch ProMedia 2.1 Public Posting

A Short Circuit Issue

The main power board detached from the back panel

Replacement of

transistor Q6 or Q7

Opening the system

  In conversations with a few visitors I have learned about the importance of the back panel. The large amp transistors and some other transistors use the aluminum back panel as a means for cooling (also be sure to remember the coupling paste). Some visitors with intermittent shut off problems have had success by placing the subwoofer box in an area with adequate ventilation (a small fan could also be used to assist with heat removal). Please keep this issue in mind and consider if you happen to have your subwoofer located in a restricted area.

Be sure to see Dale Thompson’s website for up to date schematic diagrams including the 4.1 and 5.1 systems!

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After more testing it was determined that the short was located in the low frequency circuitry of the board. The visitor reports that there was heavy scorching of the board and evidence that extreme heat had damaged if not one but a few components. In addition the copper tracings were lifted or melted. The visitor took to the means of replacing the power transistors Q6 and Q7 but to no luck in solving the short problem. It was considered that a board this badly damaged was beyond reasonable repair and thusly was abandoned.