Hello, I have a problem with the backlight of this monitor. The monitor is black. He recognizes the input of the PC and turns on the 5 V signal on pin 7 of the High voltage inverter, but no light. The power supply is ok and delivers his voltage to the inverter. Are there any schematics somewhere? Many thanks for your help. PS could not find the correct model in the list, but the monitir is a SDM S81R silver Marc.
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<P>It can be the power supply caps or the backlight inverter circuits, or worst case will be the lamp assemblies.</P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">If you are going to DIY and have proper tools and know safety precaution then please read on:<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">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: <A href="http://s807.photobucket.com/home/budm/allalbums">http://s807.photobucket.com/home/budm/allalbums</A><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Post back what you see inside so we can guide you further and it will help out other people in the future also.<o:p></o:p></SPAN></P><P style="tab-stops: 351.95pt"><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'"><A href="http://en.wikipedia.org/wiki/Capacitor_plague">http://en.wikipedia.org/wiki/Capacitor_plague</A><SPAN style="mso-tab-count: 1"> </SPAN><o:p></o:p></SPAN></P><P><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Capacitors kit: <SPAN style="mso-spacerun: yes"> </SPAN><A href="http://lcdalternatives.auctivacommerce.com/">http://lcdalternatives.auctivacommerce.com/</A><SPAN style="mso-spacerun: yes"> </SPAN>he can make you a set of caps for you.<o:p></o:p></SPAN></P><P> </P>
I had the problem sometimes, but then I connected a second computer to the analog input and found out, that the screen didnt turn black but switches between the inputs on an on.
I found out that the "input" button seems to be short or damaged, as the behaviour was invertable by pressing the button. I blew into the button some times (a very naive solution, yeah) but it worked, the switching stoppped.
When the screen turns black again take a flashlight and shine it in the bottom left hand corner where the Windows Start button is located. If you can see a faint image then your back light is failing. If that?s not the case the next step would be to attach another monitor to your computer to see if the problem disappears. If it does that points to the monitor, if it doesn?t then we need to take a look at the computer itself.
Let us know what you find out and please don?t forget to rate this posting.