Question about Sony Bravia KDL-40S4100 40 in. LCD TV

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My Sony 40" LCD is about 18 months old. I have recently noticed that the picture is dim, much more so than my old picture tube TVs. What is causing this?

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Most likely the TV has a power supply related problem. The most common thing to go out is the circuit board that supply power to the screen. Commonly called a Backlight Inverter Board.
I can't say it's 100% the problem because I can't actually look at the tv over the internet.
If by chance the TV is still under warranty, go that route.
If not under warranty and If you have some electronic experience, you can purchase a Service Manual over the internet and diagnose the source of the problem and fix it by soldering in the new part. The Service Manual will give you circuit diagrams, test points, and part# lists. Usually, cost under $20.

I hope I shed some light on the subject for you.

Posted on Jul 01, 2009

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Why LCD TV have No Picture only sound


Flat-panel LCD TVs have a lifespan newly approaching 100,000 hours on average. The lifespan of an LCD TV is generally longer than that of similar-sized plasma televisions. Some manufacturers even claim that their LCDs can last upwards of 100,000 hours when used continuously under controlled conditions (e.g., in a room with "standard" lighting conditions and 77&deg; temperatures throughout). Just how realistic such claims are is debatable. After all, whose living room has no windows and remains at a perfectly comfortable 77 degrees year-round? <br /> In any case, the pictures on fluorescent backlit LCD TVs will show some "wear" because they are generated by powerful lamps, which, like any lighting appliance, will dim over time and with use. The picture you see will dim ever so slightly as the backlighting bulbs dim. One other consideration is that CFL fluorescent backlighting will change colors over time. This will change the white balance on your TV and cause color calibrations to be thrown off. <br /> Therefore, the most important thing to consider when it comes to the lifespan of your LCD TV is the actual lifespan of the light source in your LCD. LCD TVs last as long as their lightsources do. So, the lightsource in your LCD TV is the critical component of your LCD display unit. Newly introduced LED backlit LCD TVs will have the best long term performance. LED backlighting is superior in that the white balance of the TV will not be affected by changing bulb color over time. It's a more consistent bulb technology and will also maintain its brightness longer. <br /> The edge lit version of LED TVs will use far less energy while local dimming LED backlighting will be more accurate and present a better picture while using more power. We believe that local dimming LED backlighting will be slightly less stable from a life span standpoint. <br /> To ensure the integrity of your lightsource for the duration of your LCD display's lifespan, you will definitely want to adjust the CONTRAST setting of your LCD TV. Too high of a CONTRAST level will prematurely age your lightsource because it will have to work harder to maintain such light intensities. Your best bet is to keep your CONTRAST set appropriately for the conditions under which your view your LCD display. Brighter ambient light levels require slightly higher CONTRAST levels, while lower ambient light levels demand less CONTRAST <br /> If there is sound but no picture, only sound it has more chances of faulty back light repairable from Service Support. <br /> Hope this helps, if so do rate the solution. <br />

on Jan 08, 2011 | Sony BRAVIA KDL-40S2010 40 in. LCD...

1 Answer

Please tell me how to charge tube?


you can boost the heater of the picture tube but usually it will serve only about a month then the tv will still dim picture since the tube is almost used for about 15 years. so i suggest to replaced the tube, you can find at electronics shop or replaced the tv unit.

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Check the CCFL lamps used in the backlight section. These camps can cause this type of fault, as they are very like the flourocent tube lights that we use to illuminate our room. As it goes older, the ends of them will get burned, and the intensity will go low. Like ways is to the CCFL lamps to LCD tVs tool CCFL is the abbrivation of [Cold Cathode Flourocent Lamp]

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It sounds like you might have a defective LCD panel. Your warranty for your TV is 18 months. Some of these models the warranty was mis-printed and said only 12 months.

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Only 3 months old? Any warranty?

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1 Answer

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Two possibilities:

1. The lamp. When did you last replace it? They will dim over time and lose focus, clarity, brightness and sharpness. If it has been 18-24 months, and this is your main tv, consider replacing it.

It's a F-9308-860-0. They go for about $175.00.

2. Let's say you follow my advice, put in a new lamp and the picture is still dim, dark, dingy and fuzzy? Then you, my friend, need a new Optic Assembly. The thing your lamp shines into and the thing that gives you a picture to look at. They can fail or wear out for all sorts of reasons--too many for me to type out now. But, suffice to say, if you have recently replaced the lamp (less than 6 months) and are experiencing a drop in brightness, consider getting on the phone with Sony. Even if you are out of warranty, your set is covered against Optic failure until June 30, 2010.

Hope this helps.



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These tvs are LCD they have no tube to fill or color wheel.
You need to clean the glass light filters and lens.
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