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Hi and welcome to JustAnswer,Thank you for the question and your patience. Should you still need assistance for information purposes only...Initially, bear with us; re-confirm and post back with the complete model number of the Toshiba TV.
Appreciate the additional information.
The remote is needed to disable the panel lock hence, let's check first the remote.
There is a partial test to confirm if the remote is working or not. With fresh batteries correctly installed, point the remote towards the lens of an active digital camera. For every press of any/all button(s) on the remote, there should be a bright light that would register on the LCD screen of the camera.
No light, no infrared transmission from the remote; remote most likely faulty.
On the otherhand, if the remote is good, then consider a possible IR sensor hardware concern in the unit itself.
Please post back results of camera test.
Please click HERE for instructions on removing panel lock using the original remote.
As posted above, "...if the remote is good, then consider a possible IR sensor hardware concern in the unit itself..."particularly if the remote is the original that came with the TV.
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?
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.