I have a Sony KP-57WS500 and there are arched, thin, and horizontal lines that appear.  Where could I find agreen picture tube or can I adjust the voltage myself?

u need to adjust the focus screen , this is located right under the picture tube , u need to take the front speaker grill off , look close to the botton of this grill and u would see a small cover that is covering the screw , remove ths screw and pull hard

I do believe your red color tube will need to be replaced.

Sounds like the picture tubes are failing,common on sony. do you notice any thin horizontal lines? You mite get lucky and be able to adjust the voltages. Remove back cover and look inside to see which tubes are lighting up.The front panel below the screen will come off and behind it is a small access cover.remove it. there you will find the voltage controls (its a plastic square with 6 knobs). 2 knobs for each tube, 1 is focus the other is the voltage labeled "screen". they are marked so look closely. Green is always in the middle but sometimes they flip the controls for red and blue so pay attention to which you are controlling .slowly adjust screen voltages to see if you can get it to stay on. If you over do it those thin horizontal lines will pop up and the tv will shut off again. If you already have lines back off the voltage by turning knob to the left slowly until they diappear. If that seems to fix it but the problem but it comes back later, then the tubes are shot. good luck!

common problem with sony, focus and picture level need to be adjusted, should be done by a tech. (high voltage) in focus block.

It is problem of failure of convergence ICs or related circuit. Please confirm model number of your TV that is Sony KP-57WS500 to help you out.
It would be nice if you could past TV snap shot here for easy understanding.
Thank you.

Maybee you can take the front and very tenderly adjust the voltage to the green tube. There is a how to link on here if you search for it.

I have the same tv and it did the same thing only now it has red hues all around the picture as well. The service guy told me it was the green tube and it would be about $500.00 to replace and may not fix the problem. What a p.o.s. I will not be guilty of buying any other Sony products from now on.

in the menu does it have a convergence menu? try doing that.

Hi Guys

Your problem here has to do with the amount of aging that happens to the three colour tubes - red, green and blue.

Blue actually ages slower than red and green. What actually happens is the green tube deteriorates and due to green being the predominant colour for brightness causes the blue tube`s flyback lines to appear - especially when switching between inputs or when the video is blanked.

No replacing the blue tube will not solve your problem as the tube is actually the best one of the three.

As someone mentioned there is a way to adjust this by removing the speaker grill assembly in front of the set. Doing the service mode adjustment with the remote is not the right way to solve the problem - you would be adjusting the colour gain and off-set values and would seriously be compromising the white balance of the set.

On the left hand side behind the speaker cover you will see a black square block with six adjustment points. Look for the one marked SCR BLUE, Switch the set to a unused input so the blue lines become visible. Now adjust the BLUE point counter clockwise until the lines disappear. A small adjustment should do it, Switch back to a picture and make sure the whites are still white.

This should sort your problem. I would however suggest asking a Sony service centre to do this for you. This is a dangerous thing to do as you will be working close to the 35Kv supply the the anodes of the three tubes.

I hope this answers your question.

Goo luck.

did you try to adjust convergence