Factory reset Our Sanyo TV is showing a messge 'Off 10' on the screen and then turns itself off after 10 minutes. How do we reset it to its factory settings to solve this problem?

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

T'Con board fault. Check and replace it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD screen are similar, irrespective of its brand and screen size.

There are two types of reset to TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight; will be better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Do a hard reset to this TV, and check. If it do not help you, contact any service technician. There are two types of reset to TVs. The first is simple to do; a Hard Reset; and the other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight; will be better. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.

Try unplugging the set from its power source, let it sit for 10 minutes and then plug it in again, then turn it on. Are you getting any on-screen messages or logo display when you turn it on? Is there any backlighting showing? (in a dark room, the screen should have a faint glow). Try switching the input source using the remote. If the set is less than a year old, it is under warranty. If nothing is displayed ever on screen, the panel might need repair or replacement.

The symptoms you describe indicate power supply trouble

Make a Factory Reset to your TV. Refer its user manual for details. Unplug the TV from AC mains wall socket, and re-plug it into after 10 minutes or so. Then try again.

This info was given to me by a HAM Radio friend that repairs TV's For a Living.
Disassemble TV, clean all boards from dust, unplug/replug all connectors,
most are really small, be careful, try TV again. Out Same Model TV started off the same, RIGHT bottom of screen/shadow when TV was on for awhile, since then has got worst, like 2 shadow boxes showed up, now upon startup, TV is screen is covered w/vertical lines, shut off the TV once or twice and works fine until next startup. If the above does not fix TV, look at the top of TV from Back Panel Off, Top-Center is a board called T-Con board, replace it. All the info for this board replacement is on the Bar-Code Laabel and Board itself, ie; T370HW02 VC CNTRL BD, 37T04-COG, FX-5546T03C22 (orC21)-964-0000NMP-00629-03 this board is Mgr By AU Optronics. GoTo For Parts/Pricing, they have 180 warranty on parts, aprox $45.00 for T-Con . http://www.shopjimmy.com/auo-55-46t03-c22-t-con-board.htm. He stated It IS Very Rare That The LCD Screen Itself Would Be The Problem. Right now I have Our Sanyo DP46849 apart
laying down on a bed, had to remove Base Pedestal to remove back cover,
There is a smaller cover, 2 screws u can remove to gain access to the turner board and power supply, there are 2 more boards hidden, before u remove back cover from front panel, untape wire leads from back of LCD Screen and unsnap the 2 torrid coils, black plastic things wires going through, these torrid/ferrit coils are mounted on a snap-in base, w/very small screwdriver they will unsnap from plastic base in 4 corners, if the base breaks from panel frame, just hot reglue back in place when are repairs are final. The 2 panels will seperate eaisly, if not you have some maore screws left to remove. Our TV was little dusty inside on the power supply board and alot of dust collected on some big transistors, 3 lead/legs, I'am hoping this caused the power problem @ start-up, going to clean all bard then reconnect all leads/cable, ect and retry, If no work will replace the T-Con board. Hope This Help's All

Yes,unplug,replug the tv an hour later.The tv should reset itself back to factory setting and work.Not,than the tv power supply board have problems.That the board,where the power a/c coard plug into it.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Tru using your remote to access the factory reset mode to default. It might be hard to find, but it should be listed in your tools or settings options somewhere. Also, you can unplug the set for 5 minutes and then plug it in again. This resets the computer in several models. It's like a hard reboot.