If you can hear sound but no picture that means the Data Display Channel card is good and that there is hope to bringing it back to life.
Now LCDS use ccfl (cold cathode fluorescent) as the back light that means they are not lighting up; for some reason mostly the invert-er that steps up 12vdc or 24vdc to light the ccfl. Check if the invert er is receiving voltage if it is receiving but not stepping it up then the invert er must be changed. If there is light ,sound but no picture then replace the T-CON BOARD
•Stand within operating range of the
Insignia TV, then aim the remote at the TV's receiver and press the
"Lock" button on the remote control.
• Aim the remote at the TV and press the
channel buttons to make sure the TV is unlocked. When the TV is locked, it
shows a black screen and does not allow you to view anything else. If the
screen remains black, press the "Lock" button again. If this doesn't
work, change the batteries in the remote and start over at step .
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