At first there was no picture or sound. Now the picture has come back after much blinking off and on as well as the addition of green lines. There's still no sound and I continue to hear a high pitched screeching sound all the whilte th TV's on. The red light on the front of TV was at one point flashing 6x, then 5, now not all.

SOURCE: Sony KDF- 42WE655 Blinks 5 times No picture or sound

5 flashes, bad lamp and/or lamp driver
4 flashes, bad or stuck fan

SOURCE: troubleshoot-5 blinks red light front of TV

TURN TIMER OFF. GO TO SONY.COM, TROUBLESHOOTING, OR The STANDBY light is flashing on the television and there is no picture or sound. Solution
The STANDBY light will flash if an issue is detected within the television. This can sometimes be resolved by simply following the steps below to reset the television.

1. Turn off the television. IMPORTANT: For a projection television that uses an internal lamp, wait 5 minutes after turning off the television to allow the lamp to cool before continuing with the following steps.
   
2. Unplug the television power cord from the electrical outlet.
3. Let the television remain without power for 60 seconds.
4. Plug the power cord back into the electrical outlet. NOTE: If the television is plugged into a power strip or surge protector, remove it from the power strip or surge protector and plug it directly into the wall outlet. If the issue is resolved, the problem is with the power strip or surge protector and not the television.
   
5. Turn on the television.

SOURCE: standby/timer light stays on red. no picture or sound on tv.

my sony red light flash.but it will not turn on just clicks

SOURCE: flashing red light

I think this sounds like my problem (need to replace the projector lamp). However, when I hit the "on" button, my SXRD 50" blinks green for about a minute then starts blinking red. Can you confirm the bulb solution? I was very pleased with this sight when my fan malfunctioned. I got the fan in a matter of day's from Sony and it fixed that problem.

SOURCE: Picture went out and red light on the front by

Hi,
It seems problem with low screen voltage to three picture tubes in this rear projection tv.
If standby light blinks 5 times after three seconds long pause then adjust screen volts of each picture tube to solve this issue.
Screen volt adjustment requires expertise and job of professional so please call local tv repairman to help you.
Thanks.