Worked fine on external monitor………so I ordered replacement screen based on the Sharp LQ154M1LW1C which was in there….new one came (samsung one compatible according to the company with the Sharp) and this came on very slowly and showed some stripes and blue surfaces….so assumed is was a faulty one….so got another replacement send but same problem. I have a panasonic Cf-52 with a cracked screen.You could still see some of the desktop features, like a moving window and the colour changes during start up. In this case you’ll have to replace the screen.Īlso, you might be interested in the following posts: If the screen starts showing different colors, lines, or clears to normal when you squeeze the top part of the display panel, most likely this is screen failure. Try applying some reasonable pressure to the top part of the display assembly. In this case you’ll have to it with a new one. On the other hand, if moving the cable doesn’t affect image at all, most likely the cable is good and you have a failed screen. If moving the cable affects image on the screen in any way (it starts shown different colors, lines, or image clears to normal, etc…) most likely the cable is defective and has to be replaced. Wiggle the cable while the laptop is running. For this test it’s necessary to disassemble the display, so you can access the cable.Ī pinched or damaged wire inside the cable also can cause color distortion. The LCD cable runs inside the display panel, under the screen. If it’s not there, most likely you’ll find it somewhere under the keyboard. In most laptops the LCD cable connector located under the keyboard bezel (aka keyboard cover). Make sure the LCD cable connector plugged correctly. Try reseating the LCD cable connector and see if it fixes the problem. If the LCD cable not making good connection with the motherboard, it might cause image or color distortion on the screen. The screen receives data signal from the motherboard via LCD cable. TRY RESEATING LCD CABLE CONNECTOR ON MOTHERBOARD Let’s narrow down the problem one by one. This could be bad connection, bad LCD cable or bad LCD screen. If only the internal screen shows bad video but external image appears to be normal (as in my example), the problem is somewhere inside the laptop display. If both, the internal screen and external monitor (or TV) show strange or incorrect colors or any other image distortion, this is the graphics card failure. This combination varies for different brands, for example it’s Fn+F5 for Toshiba, Fn+F4 for HP, Fn+F8 for Dell, Fn+F7 Lenovo etc… In this case you’ll have to switch video between internal and external using the Fn key and one of the F* keys in the top row of the keyboard. Other models can detect the monitor but display image only on one screen (internal or external). Some laptops detect external monitor automatically and start showing image on both screens right from startup. Most models have a VGA connector, so it would be the most common way to connect. You can connect your laptop to an external monitor using VGA cable, DVI cable, HDMI cable or S-Video cable, it depends on a type of connector you have. The main troubleshooting step is testing the video output on an external monitor (or TV). You have to know how to disassemble your computer in order to use following troubleshooting techniques. In this post I explain some basic troubleshooting techniques in case if your screen started showing strange or incorrect colors.
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