Dim picture Suddenly my tv picture became dim even after brightness contrast are kept to full.local cable operator advised to call tv mechanic.Local tv mechanic after carefull examination could enhance the brightness only a bit.He told me that picture tube has become weak and this could not be repaired or picture couldnot be improved more than this.please give your expert opinon.Thanx Saroj.

SOURCE: Sony KP-53s65

take the back off oh unplug it first and then read the label that says no user serviceable parts inside its kinda like the tag on pillows the three delta lenses can be cleaned with a soft cloth dampened with windex they are an optical grade of plastic like the screen so all those caveats apply if you are really brave you can take the lense assemblies off and clean (gently the concave) portion of the top of the crts they are filled with coolant and should be treated with care if you are really brave use windex on the plate glass mirror if you are nice to your tv it will look real good when you get done it will look even better if you know how to refocus the focus block and the screen controls all the home theater dvds wont make up for zen and the art of projo maintenance

SOURCE: Sony warms up - picture slowly becomes dark

You are losing screen voltage or whats called the boast voltage most likely. This is probably being caused by a bad capacitor in the sweep power supply. You will need to get a service manual as well as use an ESR type capacitor meter to find the bad capacitor(s). Good Luck

SOURCE: sony 7 blinks

6 times, Diagnosis: LOW B OCP/OVP (Overcurrent/over voltage). Possible causes: +5 line is overloaded. (A, B boards), +5 line is shorted. (A, B boards). Symptoms of the problem: No picture.
http://www.somelifeblog.com/2007/08/sony-tv-led-blinking-codes-what-does-it.html

also found this

CHASSIS: AX1/AX1X/RA6/RA6A
MODEL: KDP51WS550, KDP57WS550, KDP65WS550, KP46WT500, KP46WT510, KP46WT520, KP51WS500, KP51WS510, KP57WS500, KP57WS510, KP57WS520, KP65WS500, KP65WS510
SUBJECT: Picture gets bright then shuts down. After repairs tech noticed a mark was created on all 3 CRT's.
CAUSE: Found Video Output was defective causing the failure of the 200v line. 200 volt line has two fuse resistors R7301 (10 ohm 1/4w) on the CB Board. R8225 (1 ohm 1/2w) on the D board. R8208 (0.47 ohm 1/2w) also on the D Board. All three resistors are in series. One or all 3 could be open. After replacing 2 resistors and Video Output IC set returned to normal operation. CRTs will need to be changed due to phosphor damage. On Models KDP-51WS550, KDP-57WS550, KDP-65WS550 CB Board resistor is R9335 10 ohm 1/4w. D Board resistor is R6509. NOTE: This resistor may be a jump wire according to the schematic. Models: KP-51WS520, KP-57WS520 These models have a fuse resistor on all 3 CRT Boards. CB R9335 10 ohm 1/4w CR R9110 10 ohm 1/4w CG R9211 10 ohm 1/4w On the D Board R6509 is a jumper wire according to the schematic.

SOURCE: green screen

sounds like your green crt is shorting let me know if you need more assitance or if you would like to know where you can purchase a crt at.

SOURCE: Dim and reddish picture SONY lcd kf-50we610

Light Engine/optical block
Encompass Parts Distrubtion 1-800-638-3328