How long have you had the KB2? These are hardware problems. There may be broken solder joints, connections to ground loose / broken, the power-amp circuit (LM3886) is damaged etc. Check carefully. Disconnect the electrical contacts before checking out. Reflowing all of the solder joints.
Answers & Comments
How long have you had the KB2?
These are hardware problems. There may be broken solder joints, connections to ground loose / broken, the power-amp circuit (LM3886) is damaged etc. Check carefully. Disconnect the electrical contacts before checking out. Reflowing all of the solder joints.