Re your attached image, yes, that is exactly right. That will hopefully stop the SOS signal from reaching the microprocessor and affecting the backlights
operation. So in your case, did the backlights continue flickering?
RE THE badcaps post, it only refers to backlighting that uses CCFLs (cold cathode fluoro lamps), a different technology that uses long thin fluoro lights in lieu of LED strips. So not applicable in your case.
Hate to say it, but your problem is looking more and more like faulty LED or LEDs inside the panel. Bruce