I've replaced the t-con and main boards, but still no picture. I have backlights, but no evidence of menus or other graphics with a flashlight test. To the eye, no components or cables appear to be damaged. Is replacement of the power board the right next step?

Televison & Video - Samsung - LE - UN50H5203 - 50-Inch Full HD 60Hz 1080p Smart TV Clear Motion...