<p>My Ender 3 LCD display was working ok, I went to turn it on recently but is not showing any signal of life anymore...</p>
<p>I have tried unplugging and plugging again, is there a way to test if the screen still works?</p>
<p>What is the issue? Or should I just buy and install a new LCD?</p>

[{'answer_id': 14472, 'author': 'TheLamestUsername', 'author_id': 23179, 'author_profile': 'https://3dprinting.stackexchange.com/users/23179', 'pm_score': 0, 'selected': False, 'text': '<p>The fact that the bumps were in the same spots on multiple occasions points to z-axis problems. Turn your printer off and manually turn the z-axis all the way from bottom to top. If there are any tight spots, there is some <em>z-axis binding</em>. If there are no tight spots, skip to the last paragraph.</p>\n<p>Try taking off the z-axis by removing the set screws (pictured below). Remember which side was pointing up for a later step.</p>\n<p><a href="https://i.stack.imgur.com/GnC4r.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/GnC4r.jpg" alt="enter image description here" /></a></p>\n<p>Once you do that, clean the screw thoroughly with a brush, cloth, solution, or a combination of those. Put the screw back in the opposite way this time.</p>\n<p>If you get no bumps, then it was indeed the z-axis</p>\n<p>If the bumps are still there, try lowering your temperature some more(200 is still a little high compared to what I do for PLA), and <a href="https://all3dp.com/2/extruder-calibration-6-easy-steps-2/" rel="nofollow noreferrer">calibrate your e-steps</a> if you haven\'t already.</p>\n'}, {'answer_id': 14588, 'author': 'Diesel', 'author_id': 5518, 'author_profile': 'https://3dprinting.stackexchange.com/users/5518', 'pm_score': 2, 'selected': False, 'text': "<p>There are a few issues that could cause this. Roughness in your z-axis lead screw as pointed out by @TheLamestUsername is a leading contender I would say. I'd also extended that answer to include checking the belts for your X and Y axes as well as making sure that the rods the gantry slide on are smooth since the fault appears to be in about the same X-Y location as well in the one image.</p>\n<p>However, there are a few alternatives as well. Check/confirm that the material that you're using doesn't have a lot of absorbed moisture in it. This can cause little bits of steam to 'pop' when they're extruded causing some bubbles</p>\n<p>Because of how the material is folding at the location in the &quot;updated&quot; image this looks to be an issue with the starting and stopping. All of the layer's problems appear to be happening when the gantry moves up to the next layer. Essentially more material is coming out of the nozzle there (I think) than is what should be. Confirming material diameter with some calipers can help if there's just an offset (not too unlikely I don't think).</p>\n<p>If the diameters are dead on I'd suggest reducing the nozzle temperature by a few degrees. The sensors used to measure the temperature aren't usually all that accurate, though their precision is often pretty good. While you may have it set at 200C that might not be the actual temperature. Calibration of the thermal sensors can drift over time, so while it might have been good on the last roll it may have drifted slightly. Or the material might be of slightly different composition. Try lowering the nozzle temp by 2-5 degrees and see if that has any effect.</p>\n<p>You may also have a retraction setting that can be modified. Pulling the material back ever so slightly when it finishes the one layer as it moves to the next could alos reduce some of the extra material that's coming out.</p>\n"}]
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