The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Search the site by type in the "brand name" to your device; in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.
SOURCE: LC-65D64U Sharp Aquos
Call sharp back again and tell them you first want to register for aquos advantage program, which is free. By doing that your service will go much quicker with them. You then tell them that you want to get set up for service. They will have one of their authorized professionals come and fix your tv in a matter of days. If their tech cannot fix it, they will replace your tv free of charge as long as you are within your warranty.
SOURCE: power supply bad on Sharp Aquos LC - bad board - schematic to ID?
Buy the green light going on means Standby is ok. Next, would be to locate the plug coming from the main board to the power supply and find the post that says PO which means power on. With your meter on that post, press the power button as see if the reading goes High, if it does then the main board is able to turn on the power supply. Next, find the plug on the power supply that goes to the inverter( the long board on the side) remove it and see if you have 24 volts coming out of the power supply when you press the power. If you do, then the inverter board is bad, if you don't have 24 v, then the power supply is bad. There are NO diagrams available for these set other than a flow chart if you can find one. A regular svc tech does'nt need a manual for these anyway.
Let me know how you do Kathy ?
SOURCE: WHY MY LCD SHARP LC-C3742U TURN OFFWHILE I AM
the power regulator is shot, 200-400 for a repair, sorry but you need parts
SOURCE: Sharp Aquos LC-37 is 20 months old and would not power on
it is 99% certain that what needs to be replaced is the power board.
That's the #1 problem across the board with TVs that work for some time and then start behaving like you describe.
If you know what a scredriver is I'd suggest you do it yourself.
You can seek for a new board on eBay or through Google. I'd search for "LC-37GD6U power board".
If you don't find one you'd start searching for other similar TVs and compare the pictures of the board with what you pull out of yours.
Of course you can have a technician do all that for you for a $150 more.
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