Question about KDS 17S 17" Monitor

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KDS Silver 17 inch monitor

I was not the person using the monitor when it failed by just going to black. I own the computer, it was used by another person when it failed. I'm a retired,
engineer,but know nothing about LCD monitors. When I first used it there was was a color test pattern when it was turned on.
Joe

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  • Anonymous Nov 07, 2008

    The screen comes on and goes out in 2 seconds and stays black.

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Several of these monitors I have repaired from green light "blinking" and also no light / black screen.
In many cases I found bad filter Caps after the switching regulator. The ratings seem insufficient to handle the convection cooling. I replaced C215, C209, C223, and C211 which are 25V 105C 470uF which are the primary filter for the switching regulator output I used , and I replaced C219 as well. When I replaced them I actually used a better rated 950uf capacitor laid on its side for space, since the C215, and C209 are in parallel as well as C209 and C223. All of these capacitors in both monitors were domed on inspection.

Posted on Dec 27, 2008

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Hi again,

Am not sure what happened but I lost you in the Chat/Live Session. For a while I saw you typing a message ... and then it would appear that for some reason, the session was ended.
KDS Silver 17 inch monitor - 8f39637.jpg
With your indulgence, I would post the additional steps:

  • If the LCD is receiving power, then probable faults could be the main board that processes the video and controls, the CCF (cold cathode lamps and/or inverter. This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings. Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional;
  • If you are considering a DIY, the unit has to be opened up and the fault determined. In most cases, it is the inverter. This could actually be verified by running the LCD monitor and let the PC boot even if not visible. You could try shining a lflashlight at an angle on the display and see if there is a semblance of your desktop except that it would be very dark. If yes then it is possibly the CCF lamps or most likely the inverter.
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 30, 2008

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1 Answer

Monitor comes on for an instant, then immediately goes black, any suggestions?


Yes, look for bad caps as shown in my pictures here:
http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VA702b_s/

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.
Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.

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