Can the sleep button be reset to function properly?

It's possible that the power outage could have affected the TV's settings, including the sleep timer function. You may want to try resetting the TV to its default settings to see if that resolves the issue. To do this, you can usually find a "reset" or "factory reset" option in the TV's settings menu.
If resetting the TV doesn't work, it's possible that there is a software or firmware issue with the TV. In this case, you may need to contact Hisense customer support or bring the TV to a repair shop for further diagnosis and repair.

is there a reset button on the tv? on some electronice devices, if you hold down the power button for about 15 seconds, the unit will reset.

The iPod Nano digital media player, like any electronic device, can freeze and quit working properly. When this happens, reset the device to restore functionality and unfreeze the device. Performing this reset process allows you to continue using your iPod Nano device without losing any of your digital media content.

Press and hold the "Sleep / Wake" button on your iPod Nano. Press and hold the "Volume Down" button while continuing to hold the "Sleep / Wake" button. Wait approximately eight seconds for the Apple logo to appear on your iPod Nano's display. You have now unfrozen and reset your iPod Nano.

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Timer has non-replaceable capacitor battery for 15 minute carryover during power outage.
Timer can be affected by radio and TV receivers. Unplug those devices and check if function is restored.
Reset timer and program again.
If timer function is not restored after reset, then buy new timer.
Timer has 1-year limited warranty, and is rated for incandescent only, up to 150Watts.
http://waterheatertimer.org/pdf/Intermatic-ej351c.pdf
http://waterheatertimer.org/Intermatic-timers-and-manuals.html

Hello
Before going to set the timer, you have to set the current time. Set it according to the manual with you. If the timer function work properly, there must be an uninerrupted power supply also. If the power goes off, the set time will also get resetted, and improper function will occur.
After setting the present time, set the "on" time and "Off" time. The TV will switch on at that time you set, and will switch off automatically after the end time. OK.

this problem seems to have corrected itself although the dark patch at the top of the set is still present.

I cannot think of anything in particular that i may have done to fix it but i have resorted to turning the TV off using the on/off switch after using the remote. Other than that i removed/replaced the bulb.

so far, it is 3 weeks and counting since i last had any problems.

Try unpluging your T.V. for 5hours+, then turn it back on. Worked for It's called a "hard reset" by sony.

Otherwise
Do the following steps

1. Check the Sony remote for a button labeled "Sleep." This allows you to cycle through the sleep settings and determine how long you want the TV to remain on.
2. Step 2 Press the "Sleep" button. You'll see a number come up onscreen: usually 15 or 90. When you press it again the number changes, moving up and down in increments of 15. This is the number of minutes the TV will remain on before it goes to sleep. As you cycle through it, you should see a setting with the words "Sleep Off" appear onscreen. If you leave it there, the sleep setting should cancel, allowing you to turn the set off when you like. If you miss it, just keep pushing the "Sleep" button. It will continue to cycle through the options until "Sleep Off" appears once again.
   
3. Step 3 Access the timer function to shut off the timer by pressing the "Menu" button, then cycling through the onscreen options until you reach the "Applications" setting. Press it, and then cycle through to the "Clock/Timers" option.
   
4. Step 4 Highlight the "Timer 1" setting and press the "+" button. If it's showing a given time, you'll need to deactivate it. Use the up and down arrows and move through the possible options until you come to the "Off" setting. Leave it there; that should shut the timer off.
   
5. Step 5 Repeat the process with the "Timer 2" setting, a little further down the "Clock/Timers" menu. Set it to the "Off" position just as you did with the "Timer 1" setting.
   
6. Step 6 Press the "Menu" button when you are done to exit the menu and return to the screen. You should be able to view the Sony TV as normal with no danger of it turning off.

good luck

This usually means that the TV was last shutoff by using the sleep timer. When that happens it usually needs to be turned on and off 2 or 3 times, or try using the main power button on the tv or simply unplugging it. A full reset probably wouldn't hurt either.

THe only way to use the sleep function is if your tv has a sleep function. If not then that button won't deep anything for you. Otherwise you should just be able to hit the sleep button.

There is an On Display Menu (ODM). You can access it by pushing the button located on the monitor. Use +- buttons to navigate in the menu. Here you can switch off the sleep mode or change the sleep settings. I have a simular problem... I try to turn off the power save function but it seems like it dosen´t want to understand this...