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Why do some of the old CRT TVs have gray screens when turned off, rather than black?

I'd guess it has something to do with the contrast and viewability but I haven't seen anything online when researching this question. I have a CRT right now from 1985 with a light gray screen when it is off and I'm curious as to why this was sometimes used rather than a full black screen.

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  • Televison & ... Master
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The manufactures at that time determined the base color manufactured. The best TVs were coated black...to improve contrast. Usually Sony and Zenith. They were advertised as having the black matrix tube. These sets also ran very hot for that reason. GE and others used green...these sets ran cooler and had good color success. RCA found success using red....Sony occasionally used red as well. Green was the dominate base for most TVs. The gray you described is probably the black matrix tube, and your brightness may be set brighter, do its age. Thanks for asking, Matt of Martins TV.

Posted on Dec 31, 2018

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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simplemitch

Mitch

  • 752 Answers

SOURCE: Screen is half Black

The ribbon cable that controls the screen is damaged (or the liquid crystal has baked out... tis happens when the unit is exposed to high temps or long periods of direct sunlight). From my experience w/ these calculators they cannot be repaired.

Posted on Sep 11, 2007

Eduard P

  • 71 Answers

SOURCE: DLP TV: Left half normal, vertical 6" band center is gray, right half almost black. What's wrong?

No. The optical engine is OK. You need an adjustment in the light tunel. Call a tech to do it.

Posted on Dec 10, 2007

Anonymous

  • 188 Answers

SOURCE: L13V36 Dark Screen, picture can be seen in bright light.

If the backlight lights up for a second it's probably fine - It lay odds on the display inverter in the screen. Actually finding parts for anything made by gateway may be difficult, however. They do not sell spare parts. Considering the size of the LCD i bet it would almost exceed the replacement cost of the screen to repair it

Posted on Dec 31, 2007

sheridan1952

  • 26 Answers

SOURCE: 1/2 the screen is viewable

You would be wrong. Lamps do not do that. They either work or they don't, they do not cast shadows or give half an image.

What is going on is the light tunnel has failed. It is a small, 4-sided mirrored tunnel that focuses the light into the optical chamber. It is directly behind the color wheel. I've seen this probelm dozens of times.

Posted on Feb 28, 2008

Anonymous

  • 11 Answers

SOURCE: always seen brightness and contrast not exit

try turning it on and off, wait a few hours then turn it back on. it that dont work, turn it off then leave it till the next day then try. it should work.

Posted on Jul 28, 2009

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