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Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, let's try review the basic checks; have you tried unplugging for an extended period of time? ...and then plugging back in into another outlet?
Appreciate the additional information on what has been tried.
Consider an experiment (if have not been done). Power on the TV and set to a program/channel. If at all possible, darken the room where the TV is. Wait for about 5 minutes or more. Shine a flashlight at an angle (not directly) and nearly but not touching the screen where the volume level / menu display is usually seen.
Press the VOL UP/DOWN or MENU button and note if a dark/ghostly image of the volume level or MENU could be seen.
The above is a test to determine if it is a backlighting issue.
Still and as it would be indicative of an internal hardware issue, are you then considering a DIY (do-it-yourself) repair approach?
If yes, do you have access to and familiar with a multi-meter (and even perhaps a soldering iron)?
Significant findings as it would then eliminate the backlighting system as a potential suspect. It would also appear that the power supply is functional to an extent.
...and great on the DIY!
This would then leave the T-COM board and/or the main board as the prime suspect(s).
Please post back with clear picture(s) of the inside/circuit boards. Click HERE.
Please post back with clear picture(s) of the inside/circuit boards. Click HERE with particular attention to the T-CON board and/or the main board.
I understand; when able please.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.