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Unlock procedure and to override the password lock to many popular brand TVs are given.
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There are 2 reasons that this is happening in respect to the problem commencing after your daughter has cleaned the tv. Either your daughter has sprayed the volume button with cleaner and fluid has got into the the graphite pad under the button and conducting as though the button is being pressed continuously..or she has put too much pressure on the button if it is a metallic plate contact switch.One way to find out is by pressing the down volume button.does it it click ? if it does.try the up volume..If that doesnt click the problem is the metallic plate is dented in making contact hence a new switch. Another cause ive seen is cleaning the remote control with cleaner and fluid has got into the remote and it sends signals to the tv all the time..If the remote control is hidden under a cushion and the problem stops, then the remote control is at fault and needs drying out..Hope this helps :)