Question about Sony Grand WEGA KDF-55XS955 55" Rear Projection HDTV

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Possible begining of optical block problem

My Sony has been a good TV for the most part. I have had to replace the bulb and the Thermal fuse due to the dusty corner it is in. Now I am beginning to get a faint purple smudge on the bottom that looks familiar to a tube tv with a magnet next to the screen. i notice it sometimes get better and worse. I noticed while playing a Kids disney DVD game that it appeared to e getting screen burn from the word that were on it. Is there any way to fix this or prevent it.

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  • Freddy Torres Mar 11, 2009

    Is there a way to prevent it .

  • tom_gillespi Mar 17, 2009

    How did you know when you had to replace the thermal fuse? I'm having issues with my TV also. I have a 6 blink code which means there is no DD 6Volts output on G1 Board (power supply board)

    Can this be becasue of a bad Thermal fuse?

  • tom_gillespi May 11, 2010

    What was the indicator you needed to replace the thermal fuse?



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Yes my friend, it is your Light Engine. Quite expensive to replace.

Posted on Mar 10, 2009

  • Jim Krause Mar 11, 2009

    As far as us Technicians go, our opinion is that DLP sets had no business in the home consumer market place. They were designed after the multimedia projectors that companies use for meeting purposes. The optics portion of the DLP unit is made up of polarize-rs (best described as a tinted mirror) these become very hot from the lamp and in time start to dis-color in which starts to cause the type of problem your experiencing. The only way to slow this down is keep the sets playing time to a minimum. I'm sorry about your situation. If you plan on buying another set in the near future let it be an LCD 1080P. If you need advice on the brands e-mail me at "



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1 Answer


The Optical does not on its own have a "Thermal block" some Sony sets do have a thermal fuse connected to the Lamp---on most (What is model number?) that will result in shutdown and a 3 blink error code on the front of the TV.

Mar 19, 2012 | Sony Televison & Video

1 Answer


To reach the thermal fuse you will have to remove the optical block assembly. Remove the back of the tv, about 12 screws. Removed the large support plate, and the small support bar on the left. Remove the buttom screw on the large fan on the lower right. Remove the connections to the bass speaker and the fan connections. Slighty lift on the large board assembly on the left and it comes right out after the small support is removed. There are two hidden screws holding in the optical block. You will need a long phillips screwdriver to loosens these two screws. They will loosen, but not come out. This will allow you to remove the optical block enough to to get to the front section of the TV. You should see the bulb attached to the optical block. If you look close, where the bulb was resting, there is a plastic plate with two screws, and a wire running through it. That is the Thermal Fuse. Remove the two screws and you will be able to remove the Fuse. Install the new fuse and reassemble. I recommend you remove the cooling fan on mounted above the bulb and clean it. This fan gets very dirty. Good luck.

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1 Answer

Please help-question about sony optical blocks

Talk to Sony about the blue blob issue, they may still replace the optical block for free.

If not, fix the blinking light TV.

Blink Codes
3X - Lamp cover not installed correctly, usually after lamp change, or cover detect switch is bad.
4X - Check fans (one or more failed to pass RPM test during power on diagnostics)
5X - Lamp ballast (power supply)
6X - Usually the thermal fuse - usually from inadequate air flow (fans dusty)

All other codes usually require a trained technician to diagnose and repair.

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The PROPER way to replace the thermal fuse is to remove the optical block first. There are at least two recessed screws holding the block in place. BE VERY CAREFUL removing the block as it is very easy to tear/rip wires when doing so. I cannot emphasize enough NOT TO JUST THROW THE NEW THERMAL FUSE INSIDE THE CABINET!!!! The thermal fuse is a safety device mounted near the lamp to prevent overheating. Those that choose to just let the fuse "sit out in the open air" are risking greater failures and the possibility of fire.

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The thermal fuse is located under the optical block. However the optical block needs to be removed to replace it. So unless you are very familiar with the disassembly of this tv I suggest you have a Sony ASC to do the repair work for you. You don't want to take a chance of damaging the optical block.

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heat and dust are two major problems with this type of set.These set can get very dusty inside the optics and cause this type of discoloration .Heat can cause deteriation on optics and or optics cabinet parts .It is possible to clean the optics block for dust issues only but unless you know what your doing and know what areas not to touch inside optics block .Otherwise the block would have to be replaced..

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