The stereo has the following fault: only one of the speakers is heard. I have reviewed and replaced sulfated components (bridge diode, resistors). I have desolded the STK4141 II to check with multimeter but in the datasheet the voltages do not come .https: //drive.google.com/file/d/0Bx72vQkinG6eWng3TUlUUVNLekU/view? Usp = sharing (is the service manual)