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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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Red stopped working on Dell monitor
I have a Dell Ultrascan VC8N 21 inch monitor which, because of its size, I
am reluctant to throw out. But the red has stopped working completely. Nothing comes through at all. This isn't a driver or windows issue: When I go to the screen settings on the XP desktop and try to check RED to adjust it, all I get is black. Not even a minimal amount of red, and obviously no red bleeding indicating that the tube itself is blowing Is this sort of thing usually caused by something being knocked off the back of the CRT like the red gun? Or is it likely to be more serious than that? Is this a "Gently pull the CRT neck board off of the CRT and replace it" problem? Or is it more likely an "if WHACK won't fix it (if only momentarily), nothing will" MFS |
#2
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Red stopped working on Dell monitor
"My father's son" wrote in message ... I have a Dell Ultrascan VC8N 21 inch monitor which, because of its size, I am reluctant to throw out. But the red has stopped working completely. Nothing comes through at all. This isn't a driver or windows issue: When I go to the screen settings on the XP desktop and try to check RED to adjust it, all I get is black. Not even a minimal amount of red, and obviously no red bleeding indicating that the tube itself is blowing Is this sort of thing usually caused by something being knocked off the back of the CRT like the red gun? Or is it likely to be more serious than that? Is this a "Gently pull the CRT neck board off of the CRT and replace it" problem? Or is it more likely an "if WHACK won't fix it (if only momentarily), nothing will" MFS The cause is very likely a solder joint or a bad drive transistor on the neck board, also don't rule out silly things like the cable or video card, a friend of mine was recently stumped working on his monitor and it turned out the green output of the video card had failed. Worst case you can take it to a shop and it'll likely be under $100 to fix. The tube is most certainly *not* the problem. |
#3
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Red stopped working on Dell monitor
This can be anything from a break in the leads in the cable for the red
channel through the video processing, or the bias supply to the circuits that drive the tube. The best way to check this is to follow the video path with a scope and check the DC volts with a DVM, and see where the signal stops. It is also possible that there is a problem in the circuit area that supplies the bias volts for the red gun in the tube. It is very rare that the red gun in the tube would fail completely all of a sudden. Your best solution would be to take the monitor to a service centre that specializes in monitors, and have them properly check it for you. This is not a repair you can do at home, unless it is something very simple and obvious. An after thought, did you try another monitor to rule out the display card. I have had a display card fail, causing a colour channel loss. -- Greetings, Jerry Greenberg GLG Technologies GLG ========================================= WebPage http://www.zoom-one.com Electronics http://www.zoom-one.com/electron.htm ========================================= "My father's son" wrote in message ... I have a Dell Ultrascan VC8N 21 inch monitor which, because of its size, I am reluctant to throw out. But the red has stopped working completely. Nothing comes through at all. This isn't a driver or windows issue: When I go to the screen settings on the XP desktop and try to check RED to adjust it, all I get is black. Not even a minimal amount of red, and obviously no red bleeding indicating that the tube itself is blowing Is this sort of thing usually caused by something being knocked off the back of the CRT like the red gun? Or is it likely to be more serious than that? Is this a "Gently pull the CRT neck board off of the CRT and replace it" problem? Or is it more likely an "if WHACK won't fix it (if only momentarily), nothing will" MFS |
#4
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Red stopped working on Dell monitor
Yes, I had that problem a few weeks ago and was amazed to find a completely
bent pin on the SVGA connector. I will plug my laptop into the SVGA cable and see what happens Sounds like too difficult to fix, after all if it were a bad solder joint a whack should have done at least something? "James Sweet" wrote in message newsxbtb.198157$HS4.1681506@attbi_s01... "My father's son" wrote in message ... I have a Dell Ultrascan VC8N 21 inch monitor which, because of its size, I am reluctant to throw out. But the red has stopped working completely. Nothing comes through at all. This isn't a driver or windows issue: When I go to the screen settings on the XP desktop and try to check RED to adjust it, all I get is black. Not even a minimal amount of red, and obviously no red bleeding indicating that the tube itself is blowing Is this sort of thing usually caused by something being knocked off the back of the CRT like the red gun? Or is it likely to be more serious than that? Is this a "Gently pull the CRT neck board off of the CRT and replace it" problem? Or is it more likely an "if WHACK won't fix it (if only momentarily), nothing will" MFS The cause is very likely a solder joint or a bad drive transistor on the neck board, also don't rule out silly things like the cable or video card, a friend of mine was recently stumped working on his monitor and it turned out the green output of the video card had failed. Worst case you can take it to a shop and it'll likely be under $100 to fix. The tube is most certainly *not* the problem. |
#5
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Red stopped working on Dell monitor
"My father's son" writes:
Yes, I had that problem a few weeks ago and was amazed to find a completely bent pin on the SVGA connector. I will plug my laptop into the SVGA cable and see what happens Sounds like too difficult to fix, after all if it were a bad solder joint a whack should have done at least something? Often but not always. Are you saying that if it is anything more than a bad solder joint, it isn't worth fixing? --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. |
#6
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Red stopped working on Dell monitor
Luckily what actually happened was that, on the unlikely suggestion, I tried
changing the SVGA wire which went from my Belkin monitor switch to the computer with an unused one and the red started working immediately! "Sam Goldwasser" wrote in message ... "My father's son" writes: Yes, I had that problem a few weeks ago and was amazed to find a completely bent pin on the SVGA connector. I will plug my laptop into the SVGA cable and see what happens Sounds like too difficult to fix, after all if it were a bad solder joint a whack should have done at least something? Often but not always. Are you saying that if it is anything more than a bad solder joint, it isn't worth fixing? --- sam | Sci.Electronics.Repair FAQ Home Page: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Site Info: http://www.repairfaq.org/REPAIR/F_mirror.html Important: The email address in this message header may no longer work. To contact me, please use the Feedback Form at repairfaq.org. Thanks. |
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