Question about Compaq V90 19" CRT Monitor

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Display is not stable.

I Have Compaq V90 19 inc monitor when i increases it's brightness and contrast its display is coming and going. when i decreases it's to loo then it becomes stable.

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  • Compaq Master
  • 5,568 Answers

There are a couple of possibilities and none of them lend themselves to DIY repair. It can come from arcing in a component trying to fail; you may be able to hear this (if present) by listening closely near the rear of the housing, preferably in a quiet room and near the cooling slits.
Another potential source is what is called a 'cold solder joint' that may look and even measure OK until a little more current is flowing through it.
Neither one is something most users should try to deal with unless you have some technical background since having a powered, open, circuit board can be very dangerous; there are voltages greater than 20,000 volts and several other innocent looking places with many hundreds of volts with sufficient current available to kill.
The only thing you should try on your own is cleaning the guts free of built-up dust that naturally accrues in any high voltage device. Pull the AC cord, ignore overnight, then remove the few screws you will find, often behind the bezel and perhaps a couple in the rear near power cord and video connections/cable.
I like to do this with the monitor laying face down on a soft surface so with most housing you can simply lift the housing free of the bezel and put it aside. With a vacuum cleaner and a clean paintbrush, clean all the areas you see that have obvious build-up of 'fur.'  Try not to disturb any parts in the process though, some are fragile. If the bottom of the circuit board is visible, clean that too and look for any dark brown areas caused by heat. These can become conductive if approaching black in color.
You will see a fairly fat cable leading from a black lump on the circuit board; this is a transformer responsible for producing the 20-25,000 volts. If the unit has been off overnight, you can clean enthusiastically around the rubber cap you see on the side or top of the picture tube; this is a good leakage point for high voltage.   
If you do this and it didn't help, you will have to find a surviving CRT monitor tech to take it from there.   

Posted on Sep 13, 2008

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1 Answer

HOW TO SET BRIGHTNESS OF THE SCREEN?


Hi,

Dear User...

You can adjust the brightness and contrast of your monitor to improve the readability of text and to make digital pictures appear more like they'll look when printed.

To improve the results when adjusting the brightness and contrast settings for your display, use Display Color Calibration. (Display Color Calibration helps you adjust these color settings and others.) For more information about calibrating your display color in Windows, see Calibrate your display.

The way you adjust brightness and contrast varies and depends on your specific display.

Brightness and contrast buttons on the front of the monitor. Some monitors have brightness and contrast controls on the front and use the standard symbols shown in the following image.


On-screen menu. You can change the brightness and contrast settings for some displays by using an on-screen menu, and then setting the brightness and contrast in the resulting menu. Many times, you can view the on-screen menu by pressing a button-possibly labeled Menu-on the front of the monitor.



Thanks....

Feb 07, 2013 | Computers & Internet

1 Answer

Unable to reduce brightness windows7 ultimate hp1670


laptop ot desktop monitor ?

Adjust your monitor's brightness and contrast

You can adjust the brightness and contrast of your monitor to improve the readability of text and to make digital pictures appear more like they'll look when printed.


To improve the results when adjusting the brightness and contrast settings for your display, use Display Color Calibration. (Display Color Calibration helps you adjust these color settings and others.)

The way you adjust brightness and contrast varies and depends on your specific display.

Brightness and contrast buttons on the front of the monitor.


Some monitors have brightness and contrast controls on the front and use the standard symbols shown in the following image.

Brightness and contrast symbols

On-screen menu. You can change the brightness and contrast settings for some displays by using an on-screen menu, and then setting the brightness and contrast in the resulting menu. Many times, you can view the on-screen menu by pressing a button-possibly labeled Menu-on the front of the monitor.


Laptop display. Laptop displays don't have brightness or contrast buttons on the front.

For a majority of laptops, there isn't a control for setting the contrast.


However, you can set the brightness of many laptops by pressing and holding the Fn key, and then pressing a function key to decrease brightness ( ) or increase brightness ( ).

http://windows.microsoft.com/en-US/windows7/Calibrate-your-display#

When using Display Color Calibration on a laptop, set the display to the maximum brightness setting.


Adjusting brightness automatically using adaptive brightness

Adaptive brightness is a feature in Windows that uses a light sensor to automatically adjust the display brightness to match the lighting conditions in your computer's surroundings.


To use adaptive brightness, you must have light sensors installed and enabled on your computer.


To determine if your laptop or computer monitor supports adaptive brightness, look for the Enable adaptive brightness setting in Power Options (mentioned in the following procedure) or check the information that came with your computer.


To turn adaptive brightness on or off

Open Power Options by clicking the Start button , clicking Control Panel, clicking System and Security, and then clicking Power Options.


Under any plan, click Change plan settings.

Click Change advanced power settings.

In the list, expand Display, and then expand Enable adaptive brightness.


To turn adaptive brightness on or off when your computer is running on battery power, click On battery, and then, in the list, click On or Off.

To turn adaptive brightness on or off when your computer is plugged into an outlet, click Plugged in, and then, in the list, click On or Off.

Click Apply. Click OK.


hope this helps

Jul 26, 2012 | HP...

1 Answer

Unable to adjust the settings for brightness and contrast .


To adjust the display settings:

1. Press the flywheel control. The main menu appears.

The current display settings appear across the top of the main menu.

2. Rotate the flywheel to highlight an option. The name of the
highlighted option appears in the center of the menu.

3. Press the flywheel control to select the highlighted option, then
rotate the flywheel to adjust it.

Some options can only be enabled or disabled. There are also some
options that contain additional menus.

4. Repeat Steps 2 and 3 until you have made all your changes.

5. Rotate the flywheel control until Exit is highlighted, then press
it to exit the OSD control system.


OSD OPTIONS:

Contrast increases or decreases display image contrast.

Brightness increases or decreases display image brightness.

Horizontal Size increases or decreases the width of the display image.

Horizontal Position moves display image to the left or right side of
the screen.

Vertical Size increases or decreases the height of the display image.

Vertical Position moves display image to the top or bottom of the
screen,

Pincushion curves the sides of the display image inward or outward.

Trapezoid increases or decreases the trapezoid distortion of the
display image.

Degauss removes magnetic discoloration from the display image.

Recall returns most options to the original factory default settings
if the monitor is currently using a preset video mode. (See the “Video
modes” section in this guide for information about the factory preset
modes.)

Advanced Option opens the Advanced Option menu. Color opens the Color
Manager menu.

Language changes the display language for the OSD control system.

User displays information about the monitor’s preset modes.

OSD Manager moves the OSD control window on the screen.

Exit closes OSD control system.

Jun 21, 2010 | Gateway EV 910 19" CRT Monitor

1 Answer

How do I adjust the brightness? It's too much?


Hi,
By following these steps u can adjust the brightness

Step 1
Press "Menu" on your LCD's display panel (usually below the screen). Various display options will be shown on the screen.
Step 2
Select brightness from the options. This is usually indicated by a sun. Use the "+" and "-" buttons on your display panel to increase or decrease brightness.
Step 3
Select contrast from the options. This is usually indicated by an oval half black and half white. Use the "+" and "-" buttons on your display panel to increase or decrease contrast.

Thank you

Mar 28, 2010 | Sceptre DCL 7A 17" Flat Panel LCD Monitor

1 Answer

My monitor stays white it wont show any display


Hi,
black-icon.gif This icon indicates the BRIGHTNESS control, more properly called BLACK LEVEL. It adds or subtracts an offset, or bias, into the red, green, and blue signals. This control should be adjusted so that black picture content displays as true black on your monitor. Misadjustment of this control is the most common problem of poor quality picture reproduction on computer monitors, video monitors, and television sets. Later in this document, I will explain how to set this control properly. The setting is somewhat dependent upon ambient light. Modern display equipment is sufficiently stable that frequent adjustment is unnecessary.


picture-icon.gif This icon indicates the CONTRAST control, preferably called PICTURE. It applies a scale factor (gain) to the red, green, and blue signals. It affects the luminance (proportional to intensity) that is reproduced for a full white input signal. Once BRIGHTNESS is set correctly, CONTRAST should be set for comfortable viewing brightness.

The gamma can be controlled through Video Card utility which can usually be accessed by going to display properties.

Depending on your video card software you may be able to right click your desktop, select properties, select settings tab and then choose advanced, towards the bottom. In there you may find a tab called Monitor and under that tab you may or may not (depending on your video card software) be able to adjust your color correction settings(gamma & brightness & contrast).

. Right click on the desktop and then select Properties

2. Click on the Settings tab and then click on the Advanced button.

3. Click on the Color Correction tab and you will see settings for Brightness, Contrast, and Gamma

Jan 29, 2010 | Computers & Internet

3 Answers

Contrast Ghost


This is common problem observed in many monitors compaq,HP,HCL,IBM this is happens mainly in rainy season due to moisture,by this moisture monitor button circuit get rust inside and button pad remain pressed. so it shows a strip at the middle of monitor like contrast or brightness. So this is minor problem just replace the monitor display control button sensor or circuit.Temporarily you can warm up the monitor by hanging a bulb of 60 watt nearer your monitor to takeoff the moisture.(Dont hang the bulb too near to the monitor). It definitely solves your problem.

Good Luck

Sep 02, 2009 | Computers & Internet

2 Answers

Desktop is continuing to display contrast as 100


Dear mahendra

Welcome to Fixya Customer support

This is common problem observed in many monitors compaq,HP,IBM this is happens mainly in rainy season due to moisture,by this moisture monitor botton circuit get rust inside and button pad remain pressed. so it shows a strip at the middle of monitor like contrast or brightness. So this is minor problem just replace the monitor display control button sensor or circuit.It deffinately solves your problem.

Good Luck


Fixya Customer Support
Chandrashekhar

Jul 22, 2009 | IBM E54 15" CRT Monitor

1 Answer

Laptop Screen distorted.


Your LCD ribbon cable that connects the panel to the motherboard might be damaged. I recommmend calling HP to get it serviced, or go to your local computer repair shop and have look at it. Hope this helps!

Jul 14, 2009 | Compaq Computers & Internet

2 Answers

Screen display


It's hard to find a Compaq manual their site, but they indicate you'll find this in the help files on your computer.
This is usually done with a combination of keys-look for the Fn key and a key that looks like a sun symbol. It may have an arrow pointing up or down. Use these keys together to change the brightness.

Oct 17, 2007 | HP (158800-001) for Compaq Presario 1246,...

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