The amplifier turns on and all the lights come up but there is no sound output from either speaker or headphone output. We have been advised that it needs a new motherboard. The actual unit is in very good condition, only a few marks around the body. 

BOSS Katana-50 MkII guitar amplifier key features:

1. Power and Speaker

   • 50 Watts of power.

   • 12-inch custom speaker designed for high-quality sound.

2. Amp Voicings

   • Five amp voicings: Clean, Crunch, Lead, Brown, and Acoustic. Each voicing offers a distinct tonal character.

3. Integrated Effects

   • Over 60 BOSS effects including delays, reverbs, modulations, and more.

   • Independent effects loops for each of the five amp voicings.

4. Power Control

   • Variable power control that adjusts the output level while maintaining the feel and tone of a cranked amp, ideal for low-volume situations.

5. Channel and Global EQs

   • Channel EQs for fine-tuning the sound of each voicing.

   • Global EQ for overall tone shaping.

6. Customizable Tone Settings

   • User-friendly interface for adjusting settings.

7. Connectivity

   • Aux input for playing along with music or backing tracks.

   • Headphone output with CabSim technology for silent practice.

   • USB audio interface for recording directly to a computer.