I HAVE AN OLEVIA HDTV MODEL 232513 IT DOESN'T TURN ON

If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy.
http://electronicshelponline.blogspot.com/

See solution above (from John Adams) if that doesn't work it may be the power board which is available on ebay for $69 incl. shipping. Good luck.

power supply board is damaged,only working with standby power

It may be your cable or satelite box the new motorola boxes do that frequently

is this a trick question? You have stated the model number LT37HVS! Do you mean the serial number? That is on the barcode on rear of screen where the model number was

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the remote control code for DirecTV with Olevia 242T or 237T (37' or 42') model is 11610. this code will power on/off and volume up/down the buttons on directv remote.
Or buy the Olevia RC-LRN remote control. go to olevia.com - accessories - remotes.

Try Shop Jimmy Parts in Ebay stores. Lists parts by manufacturer

I have a 32'' olevia 232v hdtv. I had a similar problem where the tv stays on less and less as you use it longer and it gets warmer. I called customer service and they explained that its most likely a problem with it is doesnt have enough power to run well. They said turn the TV off, then hit the master turn off switch in the lower back of the tv, then unplug everything from the TV, then unplug everything from the wall. Then after 3 or 4 hours, plug all back in and try again. Then they said if i still have a problem, call customer service at 1 866 9 olevia