Troubleshooting Laptop Video Problems With a Touch Screen

Troubleshooting Laptop Video Problems can be frustrating. It’s not a trivial task to open up a laptop to do anything beyond a memory upgrade or drive replacement.

If you feel daring and working with small electronic components doesn’t intimidate you, then there are videos that make the process simpler.

Even if you have done this on occasion it can be stressful working on a laptop.

There are services that will do this for a flat fee +parts.  If parts are too expensive, they may  charge you for the diagnostics and shipping. Shipping alone can be considerable.

Some places may waive the diagnostic charges if you are willing to part with the defective laptop. Plenty of usable parts for a shop that sells parts or uses them for diagnostics.

Scenario – Video Problems

Dell laptop Inspiron 3521 with  a Touch Screen was dropped. Thereafter the user complained that the video was dim and difficult to read. Otherwise, the laptop seemed ok.

Remote connections to the laptop worked fine.

Is it under warranty?12-month-warranty-shield-and-ribbon-300

We knew this laptop had been around for a while but it’s always wise to check if it’s under warranty.

Our 1st stop was Dell support. As expected it was not under warranty but they also had diagnostics and drivers that we could try.

Troubleshooting Laptop Video Problems3d-technician-repairing-Troubleshooting Laptop Video Problems

We decided to bring the laptop in for some troubleshooting.

No obvious damage was done to the case so we hoped that the issue was a cable was loose.

Troubleshooting Laptop Video – Finding out what’s wrong.

We knew the video was dim but wasn’t sure why.

When we viewed the video from a remote connection it became obvious that the colors were reversed.

Everything that should have been white was black, everything that should be blue was black.

It’s surprising how illegible the video was even when the BIOS screen was displayed.

colors-reversed-300

Colors Reversed – Top to Bottom

A Dell website was all but invisible since they use a lot of blue & white.

WHT=BLK

GRN=Purple

BRN=BLU

YEL=BLU

BLU=BLK

BLU=Red

Do we really want to open a laptop for troubleshooting?

As mentioned above, opening a laptop is not for the faint at heart.

Laptop with palm rest removed

Laptop with palm rest removed

It’s tedious work and requires considerable patience and time not to mention keeping track of all sorts of parts and screws.

We checked all over the Internet but no-one had posted anything about removing a touch screen. We did find our part though and Parts People confirmed that there were 2 parts involved:

The video below does a good job of detailing the process up to removing the bezel (3:26).

The trouble is that the bezel on our laptop is attached to the digitizer glass.

 

Our Laptop screen with digitizer

Our Laptop LCD screen with digitizer

We got it apart

It wasn’t easy but we managed to remove the digitizer glass using low heat on a heat gun and carefully inserting tools between digitizer and laptop case until we could unsnap all the clips.

Unfortunately, the cable was not our issue so we probably won’t investDigitizer-Glass-300 more time and money into this laptop.

What could be wrong?

The general consensus is that the LCD, video cable, system board could be at fault.

A shop that has all those parts could determine which were defective.

Conclusion

Troubleshooting Laptop Video Problems can take considerable time and still end in frustration.

Unless you have known good parts lying around, it probably is not worth the effort to repair a laptop that is around 3 years old.

One Comment

  • This turned out to be a bad LCD.

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