Question about LG Flatron F700B 17" CRT Monitor

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I got a black and white signal (picture ) also it is very weak , i have to increase the brightness to be able to see the black and white screen , when i turn it on some times after 5 or 10 or30 minutes it works normal ((the screen LG F700B )) thanks for all the experts

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It usual problem with LG monitors. u can fix it just by soldering vedio board epecially vedio ic affixed on crt. bt do it gently becoz any bridging of solder may damage ur microcontroller.

Posted on Sep 07, 2010

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My Model TV # is 51swx20B. Two days ago the picture started having a lot of green in it and no blue. What is the repair needed.


Do adjustments on focus block. Will have to open front panel access door, focus block blue will be on left, green will be on top. Top screen bottom focus. Turn clockwise to increase, counter clockwise to decrease brightness. Turn the color all the way down on menu where it's pure black and white and make adjustments for perfect black and white picture, then when you adjust color, it will be perfect.

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Bootup your computer and display your Windows Desktop. Make sure yourmonitor stays on for at least half an hour before you begin, so that itis properly warmed up.


Seta pure black image on the monitor so you can adjust the brightness. Toget a pure black image, do the following: Choose Start, then ControlPanel, then Display. This will open the Display Properties dialog box.Click the down arrow next to the representation of the desktop color inthe Color field. Choose black from the color palette, then click OK.


Maximizethe Brightness control on your monitor, then slowly reduce it until theblack of the image perfectly matches the black at the edge of thephysical screen. This puts the brightness at the proper setting.


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Older 52 inch tv magnavox where screen is too bright or how to repair it


There two possible things based on your description.

Go to a channel that is in black and white and examine the picture--is it black and white or yellow?

These sets do have screen controls that can be adjusted but they rarely need it.

If the picture is yellow looking it could be interpreted as too bright.

If good black and white picture---stand back ten feet when you examine it---I can tell you how to adjust the sceen controls, not real easy but can be done with someone to watch screen.

I am here to help you and I have over 30 years experience with all kinds of TV sets.

Is black and white picture somewhat YELLOW LOOKING?

iF THIS INFORMATION TOLD YOU SOMETHING YOU DID NOT know rate this solution as very helpful as I do this here for free.

If you have more information or need help comment here to this solution.

REGARDS, SD TECH

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you need to check your picture menu to verify you contrast is at max and brightness level is at approx 55% . if good , call for service and have htem check the setting on the screen controls. sometime they drift with heat, cold and age. when this happens, they usually have to reset the grey scale (black and white content) of the picture. Beyond that could be a defective red crt drive pcb or red crt or small signal panel.

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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.
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Good Day, Techwanab;

Look for this to be your problem: CHECK FOR OPEN L2C50 PART #325C146030 ON THE SIGNAL PCB, OR BAD CONNECTIONS AND LEAKY CAPS IN THAT AREA.

Hope this was helpful and not too late.

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Color Problem after replaced Circut Board


When you replace the entire board in a Zenith TV, you must make the adjustments to align the new chassis with the old picture tube. You must adjust the CRT bias and drives as well as the horizontal and vertical parameters. On the older boards there were controls on the main and CRT boards but on the newer boards the adjustments are made with the remote control after entering the service mode. Tune in the shopping channel QVC, set the color and contrast to minimum and lower the brightness until the picture is just visible. Set the CRT bias settings for a pure black and white image, then increase the brightness and contrast to get a very bright picture and if necessary adjust the drive settings so that the bright picture is pure black and white. Return the video settings to normal and then adjust the vertical and horizontal settings so that the info boxes on QVC are centered top, left and bottom. If you are not sure that you can do that right then have a qualified tech handle it for you.

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