I powered off my Sanyo NVM4030 yesterday but I can't power on it today. I wonder what's the matter with it.

You can get power supply boards and any other part you may need from here: TV Parts Universal TV Stands DLP Chips ShopJimmy

The set will need to be professionally diagnosed. There could be a # of things causing your problem. Playing the guessing game can get quite expensive.

Check the fuse as described at the following web page:
http://www.ifixit.com/Guide/Repair/Repairing-Sanyo-dp50747-Plasma-TV-Fuse-Power-Board/2229/1

when you push the power button, fan or blower on power supply spinning or not? of not. your problem is power supply, nut if yes... did you hear any beeping sounds?

Well it depend on the window you are using to run the sorftwere, you may need window XP, VSTA. to run it., and if you are installing the map through the sorftwere, you must be sure the computer you are using to run it conect to internet through when you finished, if not, some of the navigation function will fail to operate.
dijicom.

try to replace power supply if no result you going need a new motherboard sorry thanks and good luck

I ended up in the same situation and called (800) 421-5013 for help. The gentelman who assisted me said that how the DVD holds the same data as factory Sanyo 4050 GPS and upgrading has locked your device. To resolve the discussed issue one have to delete everything (plug-in your device via USB cable --> My Computer --> Removable disk) and install fresh copy onto your navigation device via that DVD.
Tried it with NO @!@ JOY

take the back off the tv and where the power cord hooks into the tv check the fuse there on the board if this isnt blown then you are probably looking at a power supply problem look at the board for anything that looks black and burnt or dark brown spots on the board. this will tell you where the problem is if it has any. but it just might be the fuse.

i think it's the built-in power surge/failure sensor.  Plug the TV into the wall and press RESET on the remote twice.