I have a 60vg825 hitachi ultra vision that has a blank screen with lamp & temp lights blinking whats the cause

Check the lamp and its ballast. Replace both of it at the same time. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. Do a search by type in the brand name of your device at its search box and press "Enter".
http://electronicshelponline.blogspot.com/
Lamp replacement procedure is given.

I tried all of the above and no luck but THEN we realized we had it plugged in to the surge protector not the battery backup. Once we plugged it in to the battery backup it powered up like a champ! Good luck!

Pls check that model number........the problem description does not match that of a 1999 crt proj tv.........I believe yours is a newer lcd projection around 4 or 5 yr old?? Lamp light flashing on any brand is indicative of the lamp not lighting . The lamp is the most likely cause,but the ballast board can cause this as well..................you should see an access door refer to owner book of the correct model and you can replace yourself...........it may cost around $200 and avaiolable at encompass parts .com Hitach distributor

The lamp is dead.The lamp in the tv now,been in used 1 1/2 or 2 years?The lamp life span is over.

yes look on Charles hyde and son web site (CHS) on right side of page under lamps enter model number of lamp

Sounds like Calibration is needed on the projection internals. Your TV uses a rear-projection system and the problem is either in the imaging LCD Unit or the light filter. I see in a previous thread you have changed the bulb. You can invest in a voltage regulator to keep the hardware in factory condition.
Also you can burn a DVD of a stuck pixel remedy video and run it on the screen with full brightness and full contrast. This is used for plasma burns and stuck pixels on conventional Flat panel TVs but can repair color issues with projection systems. This therapy is focused on the imaging unit between the projector and the main drop of your tv.
please feel free to post a more in-depth description or any changes

Blinking temp light means bad lamp fan. Needs replacement

YES, CHECK WITH HITACHI THEY ARE REPLACING SOME OUT OF WARRANTY LIGHT ENGINES

Yes, you are due for a lamp. Save yourself some money by ordering just the bulb p/n UX21516 (instead of the whole lamp assy), install it yourself. There are lots of us that sell these bulbs far below what the assy costs. Make sure it is an OSRAM bulb though.

The fan may have went bad. If it's out of warranty you may open it up and try and blow some dust out of the fan to see it that may do the trick if not it may need to be replaced. Westexaudioelectronics.com