Taking it to a tech would not have resulted in anything else, except more cost to you.
I didn't take up the initial question, I was responding to your specific question about the part number.
If it were me, personally, I would not make any investment at all in the tv.
SJ is a reputable vendor though, and I'm sure they'd allow you to return the tcon in exchange for a new main, if you wished to pursue this further.
Had you taken it to a shop, they would go through the same process - replace the tcon, if no change replace the main, if no change it's the panel, nothing can be done, and you'd still be out hundreds in diagnostics/labor fees to them.
This is a 4 year old tv, from one of the lowest quality manufacturers on the market. It is already past the service life we'd expect from it. This is why I would not consider it to be worth repairing. Taking it to a repair shop, IF it can be fixed, will run you about $300.
For a tv of this size/age/brand however, replacement would more sense. You can get a brand new LED tv, from a more reputable manufacturer with a fresh warranty for under $300.
Depending how you’d like to proceed here, I can help with finding parts (main) next, finding a repair shop, or recommending replacement options. Just let me know.
Best regards, ***** ***** for the news,
I am an independent technician and I've spent my personal time, unpaid, in an effort to assist with the question for which you solicited my services. This site works on the honor system, and to that end, I have prioritized working with you ahead of other paying customers.
Although you’ve already paid your fee to the site, I am only compensated for my efforts when customers such as yourself leave positive feedback for my work. I apologize this is not the outcome you had hoped for, though this is really beyond either of our control. I do hope you’ll consider leaving a 5 star rating for me, rather than “shoot the messenger”, so that I may get credit for my time spent in good faith to answer your question accurately. Rating 1 or 2, or not rating at all, does not produce a refund, it only penalizes me for trying to help.