Question about JVC HD-61G787 61" Television

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My screen has shadow spots that look to be on the inside of the

Screen.Is this being projected on the screen or burnt there.Can i clean something or is it permanent.

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You may be able to clean the lenses but if that dosent work it usually means its there for good

Posted on Jan 02, 2009

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TOSHIBA 57LX177 SHADOW SPOT CENTER OF SCREEN


If my research is correct you recently replaced the lamp and then the "shadow spot center of screen" appeared.

Three possible reasons I can think of for this:

Something wrong with new lamp or on face of lamp--never touch the face of a lamp as oil from you hand can leave a residue and damage the lamp or cause a image issue.

Something inside on the optical lens or even the mirror causing this--not likely but possible.

A defect in the optical light engine in the set---usually if heat which comes from the lamp damages the engine it will be a color and not black---engine has a series of lens and baffles inside that heat can damage--causes minute separation inside of the lens etc.

If the old lamp works at all try putting it back to see if same issue--did you replace just the "bulb" in the housing or the whole cartridge?

If remove new lamp look at it and where it faces--usually a clear lens faces it and if some dirt on that..........

Jun 03, 2012 | Televison & Video

1 Answer

I have a 47" rear


This is usually due to a leaking CRT. Or picture tube oxidation in the cooling liquid. Definatly not a job to be performed in the home. The cooling liquid needs to be changed in all three picture tubes. Cleaned inside the jugs and replacement gaskets. Gennerally about 60 to 85 dollars each.
often, the fluid leaks onto the power supply or sweep module and causes other problems.

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1 Answer

I have a light red hot spot just right and above center, any idea how to repair?


You have to take front projection screen off of tv. When you have taken screen off, turn on tv and observe light coming from the three crts. Look into the face of each crt and you will notice some contamination inside face of one of the crts. Most crts are sealed, so youll have to replace the burnt crt causing spot on picture.

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1 Answer

DARKE SPOT IN THE MIDDLE OF THE TV. Looks like a shadow. You can see it really good on light blue and with colors.


Sounds like a burnt blue CRT phosphor.-- Can't reproduce blue at that spot. It would need a new CRT.

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Poor picture no color


OUCH! LARGE DARK SPOT IN CENTER IS NOT GOOD FOR PROJECTION TV. YOU BURNT THE TUBES. THE LOSS OF COLOR IS THE ROOT CAUSE SOUNDS LIKE A DEFLECTION CIRCUIT PROBLEM. THE TIMING FEEDBACK IS USED TO SYNC THE COLOR CIRCUIT. IF THE TUBES LIGHT WITHOUT DEFLECTION THEY BURN THE CENTER PHOSPHOR COATING INSIDE.

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Grey shadow appears in the centre of every picture.


probably not something is up have you ever had direct sunlight hit the lens maybe at the beach? Or lots of heat can damage the lens you. lens replacement is just the same as getting a new camera. hoped that helped.

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Uh Oh! Unless this is something simple like a loose piece inside the projection chamber shadowing the screen it would have to be the light engine ($$$) warping due to overheating of its plastic housing. Check inside the cabinet for loose objects in front of the lens, then clean all the fan filters, then call your warranty company.
Hope Ya Fix It!

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1 Answer

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Sound like you light engine is going bad. A major problem to fix! Especially if you are sure it is a dlp

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Is this a DLP or a conventional 3 tube projection tv?

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