Question about Dell Computers & Internet
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: LCD causes self-test to fail
Looks like you have a shorted IC ot transistor on the LCD layer of the panel.
If you remove the screws from the back of the panel and look underneath, you will see the circuit the main board plugs into. Usually there are a few components on this pcb that can go bad. Replacing them is a little hit and miss. If you can identify the component, you might stand a chance. I had a unit do this, and when I looked at the lcd pcb there was a shorted smt transistor. It was burnt, but I was able to remove it without damaging the board.
I managed to replace it twice with two similar transistors, but the panel still caused the power circuit to cycle when I plugged it in. Although I couldn't find any other shorted parts, the small smt ICs on the board could have had internal shorts, or the transistors I used to substitute were completely wrong for the circuit. Since the original transistor was burned, I could not identify it in any way.
The only hope for your monitor is to identify and replace the bad smt component on the LCD board, or replace the lcd layer itself. I've done this a few times, but it requires another of the same panels, one with a bad backlight perhaps. If you are careful enough, you can remove the metal frame assembly from the panel (there are usually four screws, two on each side). You will have to "unsnap" the outer frame from the inner frame all the way around the outside.
Do this to both panels, and place them face up on a desk or bench. Carefully unwrap the ribbon cable and remove the entire lcd layer. Do this a second time, only place the working lcd layer over the working backlight assembly. Make sure the lcd layer seats snugly in the frame and wrap the ribbon cable over the top. Reinstall the outer frame. You have to make sure everything stays aligned as you snap the outer frame back into place. Reinstall the screws. Now you should have one perfectly good lcd panel. Keep an eye out for a panel with a bad backlight.
Posted on Mar 27, 2008
Five years is a long time for an LCD panel. You definetly got your money's worth.
But, if your trouble shooing has led you to this conclusion I can also only conclude that the power driver inside your panel just gave up the ghost.
However, try giving Dell a call, for what's thats worth and see what they have to say.
You might also want to ask this expert "Robotek" what he may think as he is a board troubleshooter and could give you an answer if one is there.
Type this or copy and paste into your browser's address bar:
And then click on the Ask Me button under his picture.
Posted on Jun 21, 2008
SOURCE: Monitor Problems
Borrow a DVI cable from some friend and test it, just in case.
If you want to use multiple monitors, ensure you are using the right settings. Go to control panel>> Display,
open the Display properties box, click the last tab at the top right hand corner, and chose advanced see here for XP, Vista is similar:
Windows XP: Learn how to expand your workspace with multiple monitors
Posted on Sep 09, 2008
SOURCE: samsung gh19ws (920nw) model lcd
Common problem is in the DC filter caps in the power supply circuits, that will be the first thing to look for first, please note that bad cap can look normal but can have high ESR.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), 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 SAMSUNG monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.
Posted on Sep 23, 2010
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