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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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PF775 blank screen
Hey Folks,
I have an Viewsonic PF775 CRT monitor on an older computer. This is my linux play box/secondary computer (ie, I don't want to spend a bunch of money on). Went to fire it up and the monitor came up blank, though the power light still comes on. I read SAM's repair FAQ at http://www.repairfaq.org/sam/crtfaq.htm as well as this brief article at http://www.pcsupportadvisor.com/Trou...lems_page2.htm. Though I'm pretty comfortable with microelectronics (when I have a schematic), I'm out of my league trying to debug a CRT cold. Couple of questions though. 1) I have a 2 yr old son that may have managed to find the contrast/ brightness controls in the setup menu. I imagine though that the setup menu would still be visible even if these controls were set way out. Can somebody confirm this for me? 2) I've done a pretty close inspection of the main PCB looking for cold solder joints or signs of overheating. Is there any other simple steps I could take before I send this for recycling? I'm debating trying to probe the transistors for shorts, but would kindof be going after the problem blind. Any suggestions where to start? The other clues I can provide a a) Monitor was working fine last time I used it. The PC/Videocard works fine with other monitors. b) There is some sounds when I turn the monitor on as it powers up. It may be the degaussing. I can try describe these better if they seem relevant. c) Sometimes when I turn it off, there is a flash of blue light in the middle of the top 3rd of the screen. Given that a 17" LCD is only $180, I don't think it would be worth the money to pay for a repair, but I may get a quote anyways. I love to both learn and tinker, so if I do get some insight I may really dig in. Certainly any opinions are appreciated Thanks in advance for any help. TMFS |
#2
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PF775 blank screen
On Sep 25, 12:25 am, wrote:
Hey Folks, I have an Viewsonic PF775 CRT monitor on an older computer. This is my linux play box/secondary computer (ie, I don't want to spend a bunch of money on). Went to fire it up and the monitor came up blank, though the power light still comes on. I read SAM's repair FAQ athttp://www.repairfaq.org/sam/crtfaq.htmas well as this brief article athttp://www.pcsupportadvisor.com/Troubleshooting_monitor_problems_page.... Though I'm pretty comfortable with microelectronics (when I have a schematic), I'm out of my league trying to debug a CRT cold. Couple of questions though. 1) I have a 2 yr old son that may have managed to find the contrast/ brightness controls in the setup menu. I imagine though that the setup menu would still be visible even if these controls were set way out. Can somebody confirm this for me? 2) I've done a pretty close inspection of the main PCB looking for cold solder joints or signs of overheating. Is there any other simple steps I could take before I send this for recycling? I'm debating trying to probe the transistors for shorts, but would kindof be going after the problem blind. Any suggestions where to start? The other clues I can provide a a) Monitor was working fine last time I used it. The PC/Videocard works fine with other monitors. b) There is some sounds when I turn the monitor on as it powers up. It may be the degaussing. I can try describe these better if they seem relevant. c) Sometimes when I turn it off, there is a flash of blue light in the middle of the top 3rd of the screen. Given that a 17" LCD is only $180, I don't think it would be worth the money to pay for a repair, but I may get a quote anyways. I love to both learn and tinker, so if I do get some insight I may really dig in. Certainly any opinions are appreciated Thanks in advance for any help. TMFS Just to make sure it is the monitor, and not the PC to which it is attached, try a second monitor before assuming it is the monitor that is at fault. Two-year-olds can do some wonderful things, maybe he/she can undo whatever they did G. H. R. (Bob) Hofmann |
#3
Posted to sci.electronics.repair
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PF775 blank screen
On Sep 25, 4:22 pm, "hr(bob) "
wrote: On Sep 25, 12:25 am, wrote: Hey Folks, I have an Viewsonic PF775 CRT monitor on an older computer. This is my linux play box/secondary computer (ie, I don't want to spend a bunch of money on). Went to fire it up and the monitor came up blank, though the power light still comes on. I read SAM's repair FAQ athttp://www.repairfaq.org/sam/crtfaq.htmaswell as this brief article athttp://www.pcsupportadvisor.com/Troubleshooting_monitor_problems_page.... Though I'm pretty comfortable with microelectronics (when I have a schematic), I'm out of my league trying to debug a CRT cold. Couple of questions though. 1) I have a 2 yr old son that may have managed to find the contrast/ brightness controls in the setup menu. I imagine though that the setup menu would still be visible even if these controls were set way out. Can somebody confirm this for me? 2) I've done a pretty close inspection of the main PCB looking for cold solder joints or signs of overheating. Is there any other simple steps I could take before I send this for recycling? I'm debating trying to probe the transistors for shorts, but would kindof be going after the problem blind. Any suggestions where to start? The other clues I can provide a a) Monitor was working fine last time I used it. The PC/Videocard works fine with other monitors. b) There is some sounds when I turn the monitor on as it powers up. It may be the degaussing. I can try describe these better if they seem relevant. c) Sometimes when I turn it off, there is a flash of blue light in the middle of the top 3rd of the screen. Given that a 17" LCD is only $180, I don't think it would be worth the money to pay for a repair, but I may get a quote anyways. I love to both learn and tinker, so if I do get some insight I may really dig in. Certainly any opinions are appreciated Thanks in advance for any help. TMFS Just to make sure it is the monitor, and not the PC to which it is attached, try a second monitor before assuming it is the monitor that is at fault. Two-year-olds can do some wonderful things, maybe he/she can undo whatever they did G. H. R. (Bob) Hofmann Sorry, should have noted that I have already tried a different monitor (which worked fine). I also hooked this monitor up to a known good PC just to be conclusively sure that it is the monitor. Darcy |
#4
Posted to sci.electronics.repair
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PF775 blank screen
On Sep 24, 11:25 pm, wrote:
Hey Folks, I have an Viewsonic PF775 CRT monitor on an older computer. This is my linux play box/secondary computer (ie, I don't want to spend a bunch of money on). Went to fire it up and the monitor came up blank, though the power light still comes on. I read SAM's repair FAQ athttp://www.repairfaq.org/sam/crtfaq.htmas well as this brief article athttp://www.pcsupportadvisor.com/Troubleshooting_monitor_problems_page.... Though I'm pretty comfortable with microelectronics (when I have a schematic), I'm out of my league trying to debug a CRT cold. Couple of questions though. 1) I have a 2 yr old son that may have managed to find the contrast/ brightness controls in the setup menu. I imagine though that the setup menu would still be visible even if these controls were set way out. Can somebody confirm this for me? 2) I've done a pretty close inspection of the main PCB looking for cold solder joints or signs of overheating. Is there any other simple steps I could take before I send this for recycling? I'm debating trying to probe the transistors for shorts, but would kindof be going after the problem blind. Any suggestions where to start? The other clues I can provide a a) Monitor was working fine last time I used it. The PC/Videocard works fine with other monitors. b) There is some sounds when I turn the monitor on as it powers up. It may be the degaussing. I can try describe these better if they seem relevant. c) Sometimes when I turn it off, there is a flash of blue light in the middle of the top 3rd of the screen. Given that a 17" LCD is only $180, I don't think it would be worth the money to pay for a repair, but I may get a quote anyways. I love to both learn and tinker, so if I do get some insight I may really dig in. Certainly any opinions are appreciated Thanks in advance for any help. TMFS Looks like the problem has resolved itself (at least temporarily). One of the things I did to try pinpoint the problem was to power up the monitor without a pc and look for the "input cable disconnected" warning. Initially the screen was blank, but I inadverdantly left it on overnight. Turns out it started to work of its own accord. Of coarse without a cable the monitor never went into sleep mode, so the monitor had warmed up to normal operating temp. I think this definitely points to a bad solder joint at this point. I suspect the problem will return shortly, so I'd still be happy to hear any thoughts on where to start with this problem. While it was operational, I answered my first question. Regardless of the brightness/contrast, the user setup menu is always visible (at least on this monitor). Thanks Again, Darcy |
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