Sounds like the remote sensor inside the TV is faulty. Check and replace it. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
SOURCE: Sony Vega Digital TV model KD-28DX50 U
the symptom is usually caused by a breakdown in the power supply circuit. in most modern receivers (transistorized and/or ic), it may also be caused by a breakdown in the horizontal deflection circuits (hor. oscillator, pre-drive, or drive circuits). supply voltages for the tuner, vif,sif, and vertical output are usually supplied by the horizontal output circuit. but if you doesnt know anything about these stuffs, better bring it to a qualified service technician
SOURCE: Telefunken LCD TV
As far as I know the only way to set lock mode on/off is using the remote.
The only thing I can think of is unplugging power cord for five minutes to check if this reset settings.
You can get a remote here :
Remote controls for TELEFUNKEN
SOURCE: Olevia 437-S11 stuck in standby mode
My classroom TV seems to be stuck in standby mode. Blue light is on but TV won't turn on either by push button or remote.
SOURCE: How to unlock telefunken TV set
I would reccomend the following:
Press and hold in the "display" button on the remote for about 5 seconds.
This worked for me
Thank you,
Regards
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