The flash pattern most likely indicates the nature or perhaps the cause of the error.
Check the TV's User Guide/Manual - Troubleshooting section.
If nothing there, then go online to Sharp's website and look for FAQs and/or any Forum postings.
Or the User Guide/Manual itself if necessary.
The key is to find out what the 2-long, 5 short flashes mean. Then that information should provide some guidance as what to do next.