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#1
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My monitor has a reddish tinge on the lower screen when I boot. It
only appears on boot while showing the advertising for the motherboard. It does not show when the boot is finished and Windows is showing. In the last few weeks the reddish color has advanced upwards towards the center. Has anyone experienced this with their monitor? (It is an old monitor.) |
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#2
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In message , maury
writes: My monitor has a reddish tinge on the lower screen when I boot. It only appears on boot while showing the advertising for the motherboard. It does not show when the boot is finished and Windows is showing. In the last few weeks the reddish color has advanced upwards towards the center. Has anyone experienced this with their monitor? (It is an old monitor.) Is it a CRT? If so, maybe it needs degaussing. Some CRT devices (monitors and TVs) have power-on degaussing (sometimes detectable as an audible thump when turning on); this may have failed on yours. You used to be able to get degaussers - basically just a coil, fed with AC, that you moved _carefully_ around the tube - don't blame me if you borrow one and make it worse though! When you say it doesn't show when Windows is showing, are you sure - have you tried any of the numerous free monitor-testing utilities, that give you full-screen white, black, red, blue, green, horizontal lines, vertical lines? (I've just googled for you, and the one at https://www.majorgeeks.com/mg/getmir...utility,1.html seems to pack a lot into 392KB; just run it, click pattern test, and space through the patterns.) If it _isn't_ a CRT, it's puzzling: maybe some RAM in the video card, and/or the driver chips to it, is fading (still working except during the first few seconds). Do you see the same effect with another monitor connected to the same PC? The "advertising for the motherboard" can often be suppressed - look on it for text such as "press Fx to see boot information". Or there may be a BIOS setting to suppress it - often called a "splash screen". -- J. P. Gilliver. UMRA: 1960/1985 MB++G()AL-IS-Ch++(p)Ar@T+H+Sh0!:`)DNAf I don't see the requirement to upset people. ... There's enough to make fun of without offending. - Ronnie Corbett, in Radio Times 6-12 August 2011. |
#3
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On 08/07/2018 05:08 AM, maury wrote:
My monitor has a reddish tinge on the lower screen when I boot. It only appears on boot while showing the advertising for the motherboard. It does not show when the boot is finished and Windows is showing. In the last few weeks the reddish color has advanced upwards towards the center. Has anyone experienced this with their monitor? (It is an old monitor.) IIRC, a neighbor had that problem. Standard DE15 (15-pin VGA) connector has separate pins for red, green, and blue. The blue (or green) pin was bent and not making contact. -- Mark Lloyd http://notstupid.us/ "All religions are founded on the fear of the many and the cleverness of the few." -- Marie Henri Beyle (Stendhal) |
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maury wrote:
My monitor has a reddish tinge on the lower screen when I boot. It only appears on boot while showing the advertising for the motherboard. It does not show when the boot is finished and Windows is showing. In the last few weeks the reddish color has advanced upwards towards the center. Has anyone experienced this with their monitor? (It is an old monitor.) By "old" do you mean it is a CRT (cathode ray tube) type? Or is it an old LED monitor? Pretty easy to tell by depth and weight if it's a CRT. CRTs don't last forever. They begin to lose their intensity (not enough electrons coming off the heater), so users up the brightness but also lowers the contrast. A shop can overheat the heater to burn off the crud but that risks burning out the heater. Timings will drift over time with CRTs. http://wiki.diyfaq.org.uk/index.php/...discolouration Do you have only one video output from your computer? If not, like you have a video card and onboard video on the motherboard, you could try switching the monitor to the other video output. First check the BIOS to see if you need to switch which video output to use: some will auto-switch but some don't so you need to change the BIOS setting. Could be a video card or onboard controller going bad rather than the monitor. That the red tinge disappears after the POST screen disappears could be the defect only occurs at the lower video resolution during bootup. With CRTs, you had to adjust positioning and other controls at the different resolutions. Resolution at boot depends on what you BIOS uses. "Old" doesn't say how old is your computer. I thought VGA (640x480) was used at boot-time to display the POST and BIOS screens. After you load Windows, the video resolution changes to whatever you selected which is likely higher than VGA mode, so the tinging goes away. Either you can halt the boot at the POST screen and play with the monitor's controls to adjust timings at that time or you can go into Windows and change the video resolution down to 640x480 to see if the red tinging reappears. "Old" gives no clue WHAT you have. Give the brand and model of monitor, and computer (or the mobo if you built the PC), and video card is you're not using onboard video. |
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