Sound bar repair

I'm experiencing issues with my Vizio m512a-h6 sound bar - it isn't turning on, despite having tried different power sources and cables. Interestingly, I've inspected the unit and found no visible signs of physical damage that could explain its lack of response. I'm seeking an experienced technician in electronics repair, ideally with a specialisation in sound bars, to identify and resolve this issue. A successful freelancer for this project would have:

- Demonstrated experience in electronic troubleshooting and repairs
- Specific knowledge of sound bars and their components
- Ability to effectively communicate and diagnose potential issues
- Proven track-record of successful similar repairs

Given the absence of physical damage, you'll need to focus on the product's internal mechanism to locate and rectify whatever seems to be preventing it from turning on. Any potential bid should include the cost for your services, and any additional charges I might incur for parts or materials required to fix the sound bar. Your bid should also estimate the time needed to complete this task. Please note, your repairs must not create any new damages to the outer casing of the sound system.