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James lendio Posted on Jan 12, 2007

Have a large yellow spot in the middle of the picture

Hi, I have yellow large spot in the middle of the picture. will my projector be expensive to fix ? james

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  • fredaaron Sep 09, 2008

    I am haing a Sony VPL-PX30 LCD projector with a yellow spot, I found that the Blue LCD LCX023CMT1 defective.

    Sony says to replace the full prism block p/n 175845911 which is very expensive.

    I think this is a common problem with VPL-PX30.

    I want to buy only the blue LCD if available. LCX023CMT1.

  • lldressler Dec 16, 2008

    We have a large yellow spot in the right upper corner or our picture.

  • dima5 Feb 26, 2009

    I have the same problem on mine as well. I don't think it's the prism block since the spot has pixelated (rough) edges. I think if it was the prism, you would get an out of focus yellow hue in the center. It might be the blue lcd panel driver circuit.


5 Related Answers

Jaime Hernandez

  • 2351 Answers
  • Posted on Feb 25, 2008

SOURCE: Sony 60" LCD projection TV has yellow screen discoloration

I would suggest to try to get this TV fix while still under warranty. Normally the manufacturers give one year.
In regards to the discoloration, there is not much you do but to let the Sony authorized repair center knows about it so they can fix it. Ask them if their work is guarantee as well for how long.
Good Luck.



  • 105 Answers
  • Posted on May 18, 2009

SOURCE: Large yellow spot in center of tv screen

Sorry, but there is no cheap method of repair for this unless it is in warranty.

This TV will require replacement of the LCD Prism unit.

This Prism blocks and allows colors so that the 3 LCD images may be mixed to produce the final image you see on the screen. When this becomes damaged or defective, it leaks colors (light). This Color Leakage apears as spots on the screens.

Where you see the spots is where the specific spot on the prism that is leaking light, the specific color that is leaking also.

This parts cost alone is normally $500 to $1000 dollars but is usually replaced under warranty.

Good luck.....


  • 157 Answers
  • Posted on Sep 24, 2009

SOURCE: Two color variant spots in the middle of my Sony KV-34HS420 34 in

your tv needs to be degaused or cant be a bad picture tube unless it was dropped.
you can call a local shop to degause it in your home.rather easy and inexpensive to fix.


  • 201 Answers
  • Posted on Jul 04, 2010

SOURCE: yellow spot

Sounds like the optical block (the projector part of TV is failing) The block cannot be repaired it has to be replaced. It can easily cost several hundred dollars to fix. Sony did extend the warranty on some models, you can try going on their website to see if your model is covered or not. good luck!


  • 51 Answers
  • Posted on Aug 29, 2010

SOURCE: I have a large yellow spot on my screen..... Will

Your set uses red, blue, and green lcd panels to produce your colors. The lamp provides the illumination. What has happened is the blue lcd panel has been damaged in the area you are seeing the yellow. The fix for this is to have the optical block (also known as the engine) replaced. This is a very expensive part,... you may want to move on to a flat panel tv.


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Yellow spot

the problem is in the light path starting with the blue input polarizer then the blue lcd hopefully its just the input polarizer. worst case you will have to replace the LCD block witch is expensive to do. the polarizer ia a speacialy tinted glass designed to help with the LCD's temp.

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This is a Blue LCD Polarizer that will have to be replaced if the spot shows yellow.

You will find that this will only get worse as time goes by.


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Hi there

I'm afraid this might be a faulty Mainboard.

Your lamp will never make the Projector show funny stuff on the image.

Must warn you that a new Mainbaord is quite expensive
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