The picture in my Sony Wega is not nearly as clear as before.

Overheating? Check fans working near lamp

Dear , i think its Physical Problem in your TV, if your projection Lamp is Ok , so then its a Picture Tube or may be its a Display Circuit Problem..

look likes E H T problem. Watch the rear of the TV. If you find blue arc anywhere, you have to check that component. Take care while handling the E H T side near the picture tube.

Even if the TV is disconnected there me dangerous voltage present in the E H T connecting point of the picture tube body. Take service center help.

It sounds that there is some magnet near by TV that is affecting picture tube. Please remove any extra speaker or any thing that has strong magnet inside, unplug TV for 20-30 minutes, replug back in, turn it ON, hope that will solve your TV problem.
Thanks.

If you are comfortable with working inside the set where there are potentially dangerous high voltages present, you can probably fix this easily. Open up the back and remove it. Plug the set back in and turn it on. In the lower right hand side will be the flyback transformer (large red wire coming out of the top and going to the side of the picture tube). DO NOT TOUCH IT!!! On the back of the flyback should be 2 "knobs". One will be marked screen and the other focus. Carefully adjust the focus until the picture is clear. When you do this, go beyond the clear point and work the control back and forth a few times before settling in to the focused spot.

That should resolve the problem.

Dan

If it is dark because of an adjustment the "picture" adjustment would make a difference.
The most likely cause of a dark picture on this type of set would be the lamp getting near the end of it's life. This set should use part number, A-1606-034-B and is something you can probably change yourself, check your owners manual, it shows how. Follow the instructions and remember to have the power chord unplugged while you are changing lamp and to put the lamp door back on the set before you connect the power chord again.

Please remove any speaker or megnatic thing near to TV.

Maybe you put magnet near to your TV or something that can produce magnetism.... if not the deguassing system is not functioning anymore. .. bring your unit to near service in your place.

it sounds like a b+ cap going bad and is intermittant that feeds the the video drivers on the crt pcb or the crt is shorting.

your problem is due to video or luminance section. remember it is loose contact only in that section or print loose. please check 1 crt base loose 2 supply line loose contact. 3 loose contact near chroma signal processor in luminance section only. 4 any connector loose. 5 no component failure.