Laptop Horizontal Color Line Bar Problem Solved
Received one laptop in my workshop with the problem of – Horizontal line color Bar at bottom of the screen. Look at the photo below:
This laptop is HP Pavilion DV6 Series. This symptom indicates three possible faulty sections which cause this symptom.
1) Motherboard Graphic chip related.
2) LVDS Cable
3) Screen itself BAD.
First I have connected the laptop with my external monitor to check the symptom on the screen. And I found screen is clear there is no Color Bar Fault so this symptom will eliminate one suspect part that is Motherboard because it doesn’t show fault and screen works fine. Now two suspected parts left. It is either the LVDS cable or the Screen itself.
So I have dismantled the screen of the laptop by removing two screws at the front bottom edge of the screen. On visual inspection I did not found any physical damage or burnt mark.
So I have removed the LVDS Cable and checked for physical damage (You can do a continuity test because some time Cable can get cut from Hinge side) and for oxidation on pins but seem OK and clean. So for my confirmation I have cleaned the connector with IPA and reattached the cable to see the result but still the same problem.
So now it is time to check the next suspected item which was the Screen.
For testing of the screen you have to buy new screen. I have ordered a new screen. After arrival of new screen I have connected to the laptop and powered on the laptop and I found problem was resolved.
Applied paper Tape for Holding the Cable in the connector firmly so that it won’t get loose on jerk.
Now, laptop is ready and wait for the customer to collect it back.
One interesting thing I have found and looking for an answer-look at the photo below:
Anybody know why this magnet is used in Bezel? If you know I would love to hear from you in the comment section-thanks.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
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