Question about CTX PV 720 17" LCD Monitor

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Faulty monitor ctx pv720a. The screen has the

Faulty monitor ctx pv720a. The screen has the message "no signal input" when unplugged as you would expect, but when plugged into the video cable... nothing. Checked other monitors on the PC, fine. Checked this monitor on other PCs, same problem. Checked for bad caps, couldn't find any the all looked good, and the screen works with the no signal message, so somehow the data is not getting through... Any ideas anyone?? Thanks, David

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  • David Wedge Jan 09, 2011

    Thanks for that, I will look into it. Sign of the times I guess! but I just hate to throw out stuff that might just be fixable. I have fixed both my Meile washing machine and dishwasher,saved £1000 to replace both, by fitting new bits at PCB/soldering iron level. Thanks again.

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Try another cable, or check the plug for bent pins. If they are all good, check that the monitor is set for VGA input (if it supports VGA and DVI) as it may be looking for a different input. Then replace the monitor. It's not common, but video processing circuitry can sometimes fail, and yours may have. New 17-inch LCD monitors are quite inexpensive now, so it would probably be more economical to replace this one than to try repairing it.

Posted on Jan 01, 2011

  • David Wedge Jan 09, 2011

    Thanks for you suggestions, I have already tried all those, well apart from buying a new monitor! That is hardly a solution is it?
    Thing is... it can't be set up as it was working fine for a few years, then it just stopped.

  • Jan 09, 2011

    Yeah, I agree that replacing the monitor really isn't a "solution", but sometimes it's all that can be done. Manufacturers don't often make service information available for these kinds of products, or even design serviceability into them, as they expect people to replace rather than repair them if they go bad. It's frustrating, since any problem has a real solution. But that's the attitude now: make it cheap, sell it cheap, replace it when something goes bad. I have a large collection of electronic stuff because I know it's probably fixable, and sometimes I do eventually get it going. I enjoy the exercise of tracking down the real solution, but sometimes it just never happens. Electronic technicians can be a stubborn bunch, though. I did find one page http://warrantyvoidifremoved.com/tft-rep... where several people mention your same model as being fixed by the trick the author used on another model. If you have electronic service skills or know someone who does, it might be worth looking into trying on your monitor. It may not be what's wrong, but at least it's something to try. Unless I were to have your monitor here to work on, it's the best I can offer. Good luck!

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This is what inverter board looks like:
http://www.shopjimmy.com/catalogsearch/result/?q=CTX%20PV720

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Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply, blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
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