Compaq Presario 1510 (White) 15 in.CRT Conventional Monitor Logo

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Question about Compaq Presario 1510 (White) 15 in.CRT Conventional Monitor

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Have lost ability to control brightness.

We have had this monitor for years but just last week the brightness has become all screwed up. Even when booting so it should supposedly be a black creen with some DOS text our's is displaying a bright grey. overall it is very difficult to use, but before I dump it I thought there might be a fix available. thanks in advance.

Posted by Steve Kelly on


1 Answer

Larry Ng

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  • Compaq Master
  • 7,650 Answers

wow a CRT that even glows at all , and you wonder why its dem
the electron gun cathodes get weaker every day of its life.
all CRTs do that, not one or even TVs using CRT
the red gun always goes dim first so we crank it up in the OSD.

if it fails on all PCs, the monitor is bad, a 5 min test. and bingo
then if the monitor is known bad then what.
the OSD screen ever seen that, and the front panel key marked MENU/?
go there and play with brightness, and even the electron gun tuning, the page for that is RGB, Red Green blue.
adjust them so white looks OK.
but if all are dim, that is normal for old CRT,
we only get like 3 folks a year stuck in 1990s... or older.
the labor to fix it is 3 times a new LCD LED display.

land fill time. like the other billion made, and scrapped

Posted on Nov 20, 2017


5 Related Answers


SOURCE: Horizontal Bright White Line in Middle of Screen.... and thats it.

I am having a similar issue with my NEC multisync FP912SB monitor. In my case the problem is intermittent, the line remains at the same level of brightness, and the osd, when activated, is compressed in that horizontal line as well. The problem is occurring more and more frequently. Banging on the sides of the monitor sometimes brings the picture back temporarily. I came across this.

It states that the problem is called vertical collapse and is caused by the failure of a couple of I.C.s in the monitor.

Hope that helps.

Posted on Nov 13, 2007



  • 6966 Answers

SOURCE: Brightness


All CRT type monitors have an FBT that supplies the high voltage to the tube. Additionally, it also supplies the G2 voltage that is responsible for the screen voltage. Often the adjustment for the Screen/G2 requires a bit of tweaking after some time of usage. Incidentally, there is another adjustment in the same area for the Focus control. Of course, adjustment would have to be done on a "live set" and on the high voltage section, extreme caution must be exercised when performing this operation.

In some extreme cases, it could be a cold solder or loose connection in the squarish PCB at the very rear of the tube. Alternately, it is also possible for a capacitor that is nearing end of life (dried up).

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Sep 21, 2008


  • 65 Answers

SOURCE: COMPAQ 7500 monitor, MenuBar/Brightness Bar, Keys not working

replace Menu buttons (Microswitches) and check 5v path
check dry points.

Posted on Oct 15, 2008


pravin bhavsar

  • 348 Answers

SOURCE: monitor is control locked

you did not given details of model, company complet discreption of problem ok no problem you press the four keys on the monitor for five seconds simultaneusly or till it will show the massage "keys unlocked" then release

Posted on Nov 23, 2008


  • 77 Answers

SOURCE: The brightness adjustment bar appears on the screen all the time

Press the menu button on monitor select the brightness press the menuside button increases or decreases.after select exit oress the exit button on monitor.

Posted on Jul 13, 2009

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Related Questions:


Dim monitor issu. I want it bright always.

it could be age-related but there is also a power setting in the OS. Alternately you can check also the monitor OSD and see if there is a setting for adaptive brightness enabled

Brightness and contrast increases suddenly

Check following:
1- VGA chord; is it loose or faulty?
2- Power Supply section not regulating perfectly.
3- Supply line from SMPS/Regulator power supply to EHT.
4- Brightness lines and controls (Resitance may be dry soldered or burnt)
5-Pin connection on rounded board of CRT neck may be loosed, Check it if loose than fit properly.
6- Adjust the precet for accelearting and focusing anode externaly fixed with EHT if inbuilt in EHT than only solution is to replace the EHT only.

Will not display a picture

It would appear that some component has given out the ghost. The earlier symptoms were giving you warning that something was failing. If the monitor fails to display anything, even after increasing the brightness to the max, it's probable that it needs servicing, or replacing it altogether.
You don't specify how old your monitor is, nor whether it's a CRT or LCD, but in both cases, they're built to last several years, except for when they come with faulty components from manufacturing.
Good luck!

Sudden color distortion

this can happen if there is a poor connection of the VGA cable - tighten the screws on both ends, just in case one is loose

LG Studioworks 700E

It sounds like one of the capacitators inside the monitor is malfunctioning, these little things store a certain amount of necessary power and then discharge it when it is needed.  If it is malfunctioning, it could explain why it takes so long to charge, and why when you hit it, it suddenly comes on.  

The Contrast screen pops on all the time

It looks like your UP button contact is demaged.
SOLUTION is to insert a piece from your business card mostly above the button to adjust it down or up. It works fine.
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