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The normal crt monitor have a demo display when you unplug the vga cable to PC like this image below..
If the crt monitor green LED light steady and heater beam have light, the horinzontal and High Voltage supplied to tube is completely good. If you encountered this problem just focus on video section of crt monitor. But before you start... find the flyback transformer behind this they have two controls screen & focus. After you found it plugin the monitor use plastic precision or small screw philip driver for safety to high voltage at horizontal area choose screen control rotate it to clockwise direction follow this....
If the display responses or from dim to lighter 100% you have a problem to ABL find this at the bottom of horinzontal section near at flyback transformer pins trace the line of ABL for dried solder, open resistor if nothing happen find the Video IC at chroma section and replace it. follow this...
For LG & Redfox you found LM1269NA Visit this site for seaching semiconductor matches www.alldatasheet.com Good luck.
Right click on your destop, in the middle you should see what types of VGA Card you had.( for example Nvidia Display or ATI Display) Next to right double click to open. You should see a list of informations, look for rotation and click on it. The rest you know what to do... Have a nice day!
For Windows XP -- within the control panel, click on Display Icon and the following screen will appear. I have 2 monitors (Laptop and HP L1925 monitor).On the display properties screen, near the top of the screen, click on the “Settings” tab.When the “Settings” screen displays, select the “Advanced” button near the bottom of the screen.
The “Plug and Play Monitor …” screen will appear as shown below.From this screen, click on the “INTEL(R) Graphics Media Accelerator Driver for Mobile” tab near the top of the screen.Note: Tab stretches the full width of the screen.
The "Plug and Play Monitor ..." screen will change to show Intel Graphis Media Screen.From this screen click on the “Graphics Properties” button near the center of the screen.
The screen will change to show the graphics properties. Note, the screen actually comes up with “DISPLAY SETTING” selection (in dark Blue on the Left hand side of screen). To change Display settings click on the words “DISPLAY SETTINGS” (left side of screen) and the screen will switch to show Rotation options. On the top of the screen, select the “Monitor” you wish to change by clicking on “Monitor” button.Next make sure the “Enable Rotation” box is check on the right side of screen and then click on “90”.Your monitor should rotate at this point to portrait.A message will appear letting you confirm if you wish to keep this new setting.Specify yes to keep the new setting.
Go to your toolbars bottom R/H corner and look for the VGA settings icon ( nVidia or ATI). Right click on that...and look for rotation settings, from there just followed the settings... Have nice day!
Check with the manufacturer information that you have the refresh rates and maximum resolution set correctly. If in doubt, go to your display properties and try something basic to test if this is the problem. A basic setting may be as low as 1024x768 at 60 Hz.
(You can access your display settings by right-click the desktop anywhere and choose properties, then settings).
Leave the monitor at that setting for a while to see if the monitor changes the picture.
If the picture changes, it may be component failure in the monitor. If not, the problem is then related to the settings from your VGA card are too high or dense causing the monitor to fail after a time. Try something higher like 1280x1024 @ 60Hz and keep going till the picture fails. Compare the best functioning resolution with the manufacturer claims about the product in the product documentation.
Be sure there are no cable bunches and the power cables are not wrapped up with the VGA cable under the desk or there are not too many cables lying about, although unlikely, this has been known to distort the picture.
Type ctrl-alt then use the up, down, left, and right arrow keys until it's where it's supposed to be.
If that doesn't work, right click on the desktop, select graphics properties. Then there should be a display settings, there you'll see where you can change the rotation of the display.