20 Most Recent Sony Grand WEGA KDF-42WE655 42" Rear Projection HDTV Questions & Answers

From what it seems in your question... the problem has already went away... However, I actually know about this. There is a fuse inside the tv near the power button called B-3a... If you replace that fuse it should help fix permanently

There is a separate IC on the main board that does nothing but process the HDMI signal, basically if your using the cable, AVI or any other input other than HDMI and chances are that is bad, it can be replaced if you have a lot of electronic experience, its a $3 chip but its not easy to replace..I would replace the main board if you can find one, sometimes main boards are hard to find..below is a link to the service manual. Sony KDF 42WE655 Service Manual

3 blinks means lamp cover error

I just vacuumed out my 42 wega and it looks 100% better. Not for the faint of heart but it was free and only took me 2 hours.
http://repairs.sunnyoasis.com/sonylcdtv/

Sony uses standard light error codes: I’m happy to help further over the phone at https://www.6ya.com/expert/donald_f2ed37026a3ac881

If lamp light is on at tv front then replace lamp as existing lamp sounds dead/ broken.
Lamp replacement procedure would be written in user manual of tv.
And if lamp light is not on but standby light is blinking then let me know how many times it is blinking to find out problem cause as standby light blinking is an error code.

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices. http://electronicshelponline.blogspot.com/

The KDF-42WE655 does not have a USB port. The current Roku sticks plug into the HDMI port on the TV. You will need to use the power adapter that came with the unit. Plug the USB cord (mini or micro USB) into the back (or side) of the Roku Stick and then plug the power adapter into a nearby power outlet. (It's a 5V 1A DC power adapter.) Roku sells this adapter separately on their Accessories page: https://www.roku.com/accessories . It's ~$10. If you have mounted your TV such that the power outlet is hidden behind the TV, you'll get to the outlet or use another nearby outlet. (Make sure to avoid a tripping hazard if you use an extension cord or power strip to increase the number of available outlets.) I hope this helps. Cindy Wells

could be a number of things-lens film/cover "cloudy", lamp dimming, defective optical block, etc - this tv is garbage! we finally threw ours out for garbage - two lamps exploded at $100-300 - replaced the optical block twice-garbage is all I can say - I expect to buy a tv at 4K that would last many years without distortion to our eyes, the expense of it all and total inconvenience-dealing with warranty bs etc - never owned a tv that was so much trouble!

I have a lcd tv that has a few black dots but it may be from a similar cause. During a move the screen was rubbed against i was wiping the screen later and picked a small piece of plastic off the screen. The moral is... the screens are sensitive to the touch and you should be carefull how you clean it. When i bought my tv i also bought a spray of deionized water. There must be reasons behind why we can't use windex or other chemicals on a screen these days.