To reset it to factory settings, you have to enter its service mode option. If you wish to get more details, about how to enter, adjust and exit the service mode, check the site linked here. http://electronicshelponline.blogspot.com/
Pull up previous posts by its left sidebar, or type in the
brand name and model number to of your set, to its search box, and
press 'Enter' or view it in Mosaic / Timeslide
option.
SOURCE: How do I reset a Somy bravia KDL-52W4100 back to
While holding down the UP arrow key, press the power button. The TV will turn off and back on and reset to factory default settings. Hope this helps
SOURCE: 40xbr2 bravia kdl sony LCD tv. The screen shuts
Problems relating to the automatic turn on and turn off of a set like this usually point to the main board being an issue. For this set, I believe Sony refers to that board as the "AU" board.
It's probably not the G/Power Supply board, especially if it turns itself on. Power supplies will turn a set off, but rarely--rarely--turn itself on.
If there's no kind of extended warranty involved here,
you could be looking at $500.00 for parts and labor to repair this kind of problem.
As always, try any software/firmware updates Sony might have available on their website prior to pursuing a repair visit.
SOURCE: TV will not remember settings Sony Bravia KDL 40S4011
Probably you are in "shop" mode of TV. Try to reset your TV and go through initial setup. Most important - choose "home" instead of "shop" when asked during initial setup. Resetting - keep up arrow pressed and switch of TV. Keep the button pressed when TV automatically switch back on. This will reset TV to factory defaults.
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