We have had this tv for a year and a half, always been mounted on the wall
not moved, it started showing dots all over the screen, if you look close
there are colors in the dots. It does this on all inputs, so we know it's not a cable.. what can be done is this something we can repair ourselves?
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Re: dots all over screen
If you would spray a coarse water mist on the screen, would it create the same effect?
Or, take a toothpick, wet it, then touch the screen with it leaving a small dot of water; if it looks like the other colored dots and the colors shift when you move you head slightly back and forth, what you are seeing is a lens-effect and changing the angle will alter which individual pixel you are seeing causing an apparent change of color.
It sounds as if some kind of overspray, perhaps of an oily aerosol like Pledge or WD-40 has found its way to the screen.
I'm kind of curious about this one, I don't think it is electronic in nature, please post back if you discover something.
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If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
It sounds like you have a Power Supply Board problem. The PSB is the center Board (towards left) after you remove the back off the TV. Remove Board from TV with the 6-7 screws. Replace capacitors CM811, CM812, CM817 & CS806; 1000ufd 25volts. It is the board to the left and you notice that the four cap tops are swollen.
It is easy to replace get a stanard solder pencil and you are in business.
Sony wega blue dot or star pattern on screen http://esupport.sony.com/perl/news-item.pl?news_id=206&mdl=KDF42WE655 Models: KDF-42WE655, KDF-50WE655, KDF-55WF655, KDF-60WF655, KDF-55XS955, KDF-60XS955, KF-42WE620, and KF-50WE620
There is not much for me to go on with your description but here goes,
I suppose you have a convential TV set with a glass picture tube and not one of the new types with the large screen slim style displays!!!
If it a glass type picture tube then the following assumptions are made.
I hope yopu have not shifted house recently and moved the TV around???
If you have its possible the Yoke (its a device on the neck of the Picture tube that controls magnetically the scanning dot) may have moved and only is letting you see half a picture...
This is a long shot but it could be the cause..
Now the picture is supplied to you by a fast moving dot of light (Black & White set) that scans from the top of the picture and moves very fast down to the bottom of the screen, then flys back to the top of the screen and starts all over again during this process the dot lights up the picture tube to provide you with
the picture you see... (On a colour set there are three dots)
Its quite a complex process and its all controlled by electronics inside the TV receiver.
If you are getting only half a picture then something is causing the dot to only turn on for the lower half of the picture during its write time to the glass screen,
You dont say if the half thats off is white or black, so there are many things that the service technician needs to know before even starting to look for this fault. During the dot doing its write cycle down the sceen, when it reachs the bottom and flys back to the top of the screen it receives a synchronous pulse from the TV station, and this TV signal is critical in making sure you see the same picture as is being sent from the TV station.
Sometimes this sync pulse from the TV station is very weak and so your picture may float up and down the screen trying to lock to the incoming signal.. this just may be your fault.. but you dont say if the half of the picture that you see is floating or not..
Your situation may be that your TV has partially locked to the station signal and your aerial may be problematic,
but then you dont say if its on just the one channel or all of your station channels. So there needs to be more analysis of your situation prior to a positive answer being provided....
Not sure I understand the half of the tv and half of the dvd player. Are you saying about mid way of your set is cut off and like the bottom half you have a picture and the top no picture? I can explain the dot, first you can open back of set and maybe take off hole back bezel. Get where you can put your head down in front of C R T's (tubes) and look down in them and see if you see the same thing in one or all three of the tubes. If so this explain the dot. The half problem sounds like vertical is missing. Not sure yet! Need feed back