Screen has black spot in corner that spreads to entire screen

If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

do you still have a complete picture ?,are the lines coloured,?
do the lines go from left to right or do they spread out from the blank spot in a circular direction like the suns rays?
from your description above i am sure you are describing a broken lcd screen,if i am right there is no repair feasible for this set..

Len

Sounds like a backlight is out. If its still under warranty, exchange it. First try unplugging it for two minutes to reset the t.v.

this is a failure in your light engine
this can cost $500 and up
call sony customer service
1-239-768-7547
tell them that you heard it needs a new light engine and is very expensive, they may decide to do something to help. they will want model #, serial #, and date of purchase. if you don't know date of purchase, make a good guess.

optical block failure

i have blueish on right lower corner of screen.... what causes this

replace the optical (light engine assy)

I would first try a new lamp. If the reflector portion of the lamp has any defects, it could show up this way as the light would not be uniform. The next possibility is a defective light engine. The engine portion if not field repairable and would need to be replaced. Try the lamp first and let us know what happens.

Dan

It sound like the light engine is going out or already out. I would take it to a certified Hitachi dealer have them check it out then I would call Hitachi to have them fix it for free.

This is the same problem as other posts have mentioned about the right side of the screen having a bluish-balck stripe down the side of the screen. Here's what's happening. There's a small light tunnel which has 4 very small mirrors located just behind the color wheel. The lamp shines light through the color wheel as it turns and the light goes through this small tunnel and is then relected off several mirrors before it is projected through the lens and onto the screen. Optoma apparently did not use a very good heat resistant expoxy glue when they assembled these mirrors and over time the mirrors drop down causing a shadow effect on the screen. It can be repaired without paying some repair shop a small fortune. Previous posts have a solution from another contributer whihc includes photos. I had to repair mine and it's worked fine since I used a decent expoxy to hold the mirrors.