Question about Sony KP-57WS500 57" Rear Projection Television

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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?

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  • Shahid Electronics
    Shahid Electronics May 11, 2010

    please post here an image of TV showing problem for better understanding and proper solution.

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Remove the front speaker grill and you will find an access panel (2 screws are hidden behind 2 little plastic caps at very bottom of speaker grill,just pop uot to access screws) .Remove the panel and you will see the picture tubes.In the middle you will see a little black control pack with 6 little knobs.The 2 in the middle are the green controls.They will be labled screen and focus.You will have to look hard for which is which.There may be glue over the controls if so just remove it.Slightly rock the screen control back and forth to adjust retrace lines out.If the unit shuts down during this process back it off a little and turn the set back on and proceed.

Posted on Jan 15, 2009

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Red horizontal slightly curved lines on dark scenes. Sony KIP-57WS500 Rear Projection TV 57".


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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!

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Sony KP-57WS500 57 in. Rear Projection Television


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.

Jun 05, 2007 | Sony KP-57WS500 57" Rear Projection...

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