Question about Sony BRAVIA KDL-40V2500 40 in. LCD HDTV

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I have a Bravia KDL-32D3000, 2 1/2 years old. On turning on the picture is distorted with shadowing and horizontal distorted bar across centre 3rd of the screen. After 10 minutes the picture suddenly turns back to a perfect picture. Been the case for a couple of weeks and always corrects after 5-10 minutes from turning on. Saw another solution posted for similar problem to change convergence settings but I can't find these on the menu? Thanks

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  • owen_clan Jun 07, 2010

    thankyou very much for your help and explanations.

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  • Sony Master
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Hi.

This is an LCD TV and does not have convergence, at least not in the technical meaning of the term, or in a way that can be involved in your problem.

The thread you have seen was probably referring to a rear projection or to a CRT TV, where the signal alignment and convergence is controlled by two power amps(the convergence ICs). On those tvs this symptoms would point to a convergence problem.

As first thing ensure that the problem is not caused by defective connected device or bad video cables. Test different devices (eg.DVD, receiver, console) using different cables.

In your LCD TV the video signal is digitally elaborated in the main controller board, the problem is not convergence.

An LCD TV system is basically made of a PSU (power supply), Digital controller board (main board that group most function and send video signal to LCD), and an inverter that supplies power to the backlight system that powers backlight lamps placed around LCD display.

This is a simplified description, but it can give you an idea of how things work.

If dark shadows and not illuminated areas are the first symptoms, then the picture gets distorted, then problem is inverter/backlight system or PSU.

The dark areas in this case are given by a defective inverter, or by a defective PSU not properly powering the inverter. In some case a defective main board may fail and cause the problem. Among other function the main board has control on power line to inverter.(see also Why my TV does not start up and remains in...)


If the dark areas are not caused by a backlight problem, but are instead color or contrast/light anomalies on LCD display, then the problem is either main controller board or PSU. An accessory board called LCD controller must also be tested.

The testing job must be done by a technician or by a trained DIYer, as there is need to read voltages, even high voltage on inverter, while the TV is on and the problem is occurring.

If you need to call a technician you can ring the phone number listed on the Sony owners manual or see Sony eSupport.

My suggestion is: Check cables and connections.
Check power from main, as a bad ground may cause the problem.
Test the TV using an extension and plugging into a different outlet.
Call Sony, if TV is in warranty, get it repaired, otherwise ask a quote.
If quote is too high you can commonly find cheap spares for this on Ebay, and have it repaired from a local technician.
Call sony first, as their customer support and repair conditions are usually very good. You may also have special warranty conditions, as Sony often warranty this TVs for longer than the standard one year.

Regards.

Ginko.

Posted on Jun 07, 2010

  • 1 more comment 
  • owen_clan Jun 07, 2010

    Thanks for the explanation. I don't get any dark patches just double/distorted pictures. When checking the cables the picture came back but this may have been a coincidence as the tv had been on for a 5-10 mins and this is normally when the picture comes back. What would explain the picture only being distorted for a few minutes before corecting itself? I will try again later once the tv has been off for a while. When I turn off and then on again after a few minutes the problem is not there. It appears as though once the tv is warmed up the problem does not exist.

    Thanks

  • Ginko
    Ginko Jun 07, 2010

    Hi.

    If you have ghosting effect and color patches, then problem is likely main controller board. The PSU giving out an incorrect voltage can also be the culprit. If problem starts after a while, then faults can be caused by heating, or more likely by a defective capacitor not holding charge. If problem stops after a while, when tv 'warms up', then it is likely a faulty capacitor not holding charge, either on PSU or on digital controller board.


  • Ginko
    Ginko Jun 07, 2010

    Re: What would explain the picture only being distorted for a few minutes before corecting itself?

    Many electronic components work is based on teir capacitance. Not only capacitors, but also most integrated circuit may work like containers that can be filled with water. Because of this electronics circuits work differently while the components of this type are filling up. If a component of this kind is faulty, the malfunction may correct itself after a while. Faults of this kind usually degenerate, getting to a point where the electronic does not start anymore. This happen because more components blow as the circuit is not working properly.

    The description may look ingenuous , and it is a bit exemplicative, but this is more or less the way it works.

    Other explanation is that the problem is not caused by time the TV is on, but by vibration or random factor.

    Vibrations may break contacts in an electronic board when you get what is called a "bad solder joint". This is a soldering point that does not make contact properly, causing random malfunctions. This problem was more common on old CRTs, but it is still occurring on new flat panel TVs.

    If you are using component cable, the ones with three connectors - red, green and blue, then test using a different connection (eg scart, AV or HDMI). Same if you are using different cables.

    If TV has the problem when directly connected to antenna, test using a DVD. If there is a change, then problem can be the built in tuner.

    The most likely cause at a glance is either PSU or main board. TV must be tested to find out.


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