I have Sony bravia XBR and right side the screen is more darker and have lost color. Any idea. please help if u can.

Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Tow possibilities. [1] The LVDS cable (the flat cable that connects between T'Con and LCD panel) loose contact at its connection sockets. Re-insert this very carefully, and check. [2] Fault to T'Con board itself. If so it should be replaced. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.

This problems alway the causing of the board,that call the T-CON decodering board it is dying.This T-CON decodering board alway sit in the middle at the bottom of the LCD screen panel.Tries websites like Shopjimmy.com,Ebay.com to buy a rrefurbish T-CON decodering board for the replacement.

Sounds like the tcon (timing control) board. Sometimes unplugging the LVDS cables from the tcon, cleaning and reconnecting solves this. The catches on the LVDS cables are easily damaged and must be handled carefully.

http://esupport.sony.com/US/perl/news-item.pl?mdl=KDL52XBR4&news_id=276

I replaced bulb on SOny XBR 60 with sony brand bulb about six months ago. everything was fine, then a week ago it seems that I lost the "red" portion of the color. Any suggestions?

You need to replace IC8C01 and IC8C02 part# STK394-250. They are located on the main board (in the middle of the chassis) and are mounted on a large aluminum heat sink.

if the line is in the same place all the time im afraid to say that is a pixel problem on your display contact sony they may offer you a replacement display or altleast a way of changing the set.

First, HORIZONTAL CENTER.
1) Press MENU.
2) Scroll to SETTINGS.
3) Scroll to SCREEN.
4) Go to HORIZONTAL CENTER. Move the picture to the right. Hopefully, the line will go away. Otherwise, there is a problem with the pixels or the signal processor. Call 1-800-222-SONY. Or, http://eservice.sony.com. Have a high-limit credit card handy for out of warranty repairs. Sorry about that.

on the tv remote: press menu, external entry is highlight (yellow) right press on the outer circle then scroll down to video 4 (satellite entry) (it could be on video 3 depending of the satellite assignment entry) when video 4 is highlight (yellow) right press on the outer circle on the screen you will see 1080i if settle on an HD channel hope it will fix your Sony Bravia..