HOW TO REMOVE BACK OF A TOSHIBA TV

What is the source of your TV signal: Cable? Dish Networks? DirectTV? Antenna?
Many times the Cable/Dish Networks/DirectTV controller also has an option for closed captioning. Please verify that a controller is not setup to deliver the CC data.
Also, try setting the TV CC using 'C1' or 'T1' and selecting 'Enter' to accept the change; then come back and set CC to 'Off' again to see if toggling on/off helps.

Here is a picture that shows you how to remove the front screen to get access to the mirror as well.

It will be better if u try youtube to find this ans coz videos can explain better than words can.
http://www.youtube.com/results?hl=en&q=how%20to%20open%20back%20of%20toshiba%2051H84%20tv&gs_sm=s&gs_upl=1081l21486l1l22863l11l9l1l1l1l5l1527l8324l6-2.4.1l8l0&bav=on.2,or.r_gc.r_pw.,cf.osb&ion=1&biw=1366&bih=653&noj=1&um=1&ie=UTF-8&sa=N&tab=w1&gl=IN

It is your projector tub if you are getting alot of blue in the picture. Those guns are very expensive to replace. I am sorry to tell you that. It would be cheaper set from wal-mart for your kids to play on.

open resistor on the green crt board. maybe just turn up screen control on green crt

You may have a color wheel going bad. Call a good TV Tech for this repair.

First thing that needs to be checked is the convergence IC's. Those IC's are located in the signal board and are really hard to remove. You need an experience technician to fix it for you :)

your looking to parts at the convergence area , either check for DRY SOLDER around the power supply area or replace the IC IN THE CONVERGENCE AREA starts with STK- ___ and numbers. try that , hope this helps

try unplugging it and plugging it back in, if that doesn't work make sure that your ANT. cable is plugged in and then check your reciever. Tell me how it works :-)

What's the model number, the TN55X81, or the 51H84?