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.

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6 Suggested 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

  • 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

  • 101 Answers

SOURCE: Compaq monitor 7540 brightness problem

Hi Kartik,

  • You did not mention your Operating System (OS) in the question.
  • But still you can do it by following the link.
  • From the page choose your troubleshoot manual depending on your OS
-rate the post if it helped.

Posted on Apr 07, 2010

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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.

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If you had not said you cannot change the contrast or brightness there would have been two most likely possibilities....either the monitor or the video card (even if built into the motherboard). Since you did and I assume you have unplugged both the power and data cable and replugged them in with the same result you have a bad monitor in all probability. The simplest way to verify this is to try it on another machine. If bad, which I strongly suspect it is, you have three choices.....if under warranty do the obvious, if not and it is less than 4 years old and you only use it for 3-4 hours per day it's probably worth the service charge if you can find a TV repair shop with reasonable diagnostic rates to take a peek inside. I had a capacitor blow on a 21 inch crt (not lcd) and for the price of a $30 I have been using the monitor for the last 5 years. But, be forewarned, your problem is with a non-obvious component, very probably a controller chip...and that could be a $100 bill or more depending on where you live. The last choice is treat yourself.....I have a 20 inch LCD wide screen and actually regret not getting the 22 inch. If the latter is your choice can give you some options. That is not a plug for the site by the way....they sell nothing but they do rank by price suppliers for a zillion items and non of the price search engines (for computer parts) can beat the prices there. Hope this helps.....

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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.

Dec 09, 2007 | ViewSonic VX910 19" LCD Monitor

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