Blue spot growing in lower left had corner and

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

Its the dlp/dmd chip going and soon will look like the star screen saver on windows 98. it will need replacing. they start with one or two dead pixels then it spreads. ref only->https://www.replaceyourlamp.co.uk/projector-lamps/nec/np-u250x/dmd-chip-1076-6439b/dlp-dmd-chip-1024x768-pixels-model-b.html

Your dlp chip needs replacing. It's a job to do but you can do it.

need optical block

catually is problum is related with blue lcd & blue polizer but first you clean the optical unit if the problum gon then ok other wise must chang blue lcd & blue polorize with uv filter plese contect to your nearst sony service centre

Light Engine

one of the floresant bulbs has fail there is a place in Haverhill Ma called Tops Electronics that can fix you up really quick but you will have to ship it to them they do good work there
their new name is pinnacle solutions group over 30 year serviceing

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

Understand I risk getting a bad rating from you, but I thought you should know. You have a bad optical block. Sony was supplying the optical block and covering the labor for replacement until June of this year, but that extension has expired. Your best bet is to contact Sony Customer support at 800-222-SONY. They will probably want an authorized tech to come out and evaluate the set. You may be able to get them to cover the part under warranty, but it may take a letter to the customer service executive committee to get that to happen. I am sorry I could not help more.

call SONY at 800 222 SONY and explain it to them and be prepared to have your TV fixed for free !!! the projection block is faulty do to outsourcing on that part for a limited number of tv's an mine was 1 of them , SOny took care of everything !!! good luck