white horizontal lines on screen that recede to bottom within a minute

[bozzle73]

Hi again. I previously posted on this issue so there are images and a complete description from my post a few days ago. Briefly, when the laptop has been shut down or sleeping for more than a few hours there are white horizontal lines on the bottom part of the screen that slowly recede completely to the bottom. The lines do not show up on an external monitor running in duplicate mode. 

I have removed the screen twice now and checked/reseated the connections at the screen and under the keyboard. The problem persists.  I flashed the BIOS a few days ago and the problem persists. The webcam, mic, and WWAN/WLAN are all in perfect working condition and the computer works extremely well aside from this screen issue.

Before I drop any more money on this used laptop my only question at this point is does this sound like strictly a screen/display cable issue? If it was a motherboard problem would I be seeing other problems? If it's the graphics card going bad would I be seeing other problems? Like I said, the computer works perfectly once it's operating. 

Anybody have any helpful ideas?

[Amreen]

Hello

Try updating the chipset and the graphic drivers. If issue persist the repair is the only option

#hpexpertday

[AdvisorJyo · Accepted solution]

Hi There,

You may try connecting this unit to an external monitor to check if it is an issue with the mother board or the display

If the external display works fine, then there is no issue with the system board, Only the display panel needs replacement.

If the  issue persists in the external monitor, would suggest you to update the graphics drivers and see if the issue resolves

I hope this helps

#HPExpertDay

Regards;
Jyo
I am an HP employee
Please click the White Kudos star to say thanks for helping.
Please mark Accept As Solution if my help has solved your problem.

[bozzle73]

Thank you, Amreen! I had already updated both the chipset and graphics drivers and that didn't help, so I'm sure you're right.  I think it's probably the display cable and will replace that first. That's a fairly cheap part. If that doesn't work I'll probably just hook the laptop up to the external monitor permanently and treat it like a desktop.

[bozzle73]

Thank you, Jyo!

All drivers were updated to the latest releases from HP shortly after I bought the computer.

When the laptop is connected to an external monitor the lines do not show up on the external monitor, so I'm relieved to hear it's not the motherboard! I will probably change out the display cable to see if that fixes the issue. If not, I will just leave the laptop connected to the external monitor (an old HP I had saved :smileyvery-happy:) and treat it like a desktop. 

The fact that the lines slowly disappear to the bottom of the screen leads me to believe it's a loose connection that is making contact as the laptop heats up a little. If the computer is only shut off for an hour or two, the lines don't ever show up. When it's shut off long enough for everything to cool down, that's when I see them. 

Thanks again!

[AdvisorJyo]

Hi Bozzle73,

Thank you for your response.

For unit overheating issues, you may update latest BIOS from the support website and observe the unit.

Alternatively you may also try cleaning the fan and see if it helps 🙂

Regards;
Jyo
I am an HP employee
Please click the White Kudos star to say thanks for helping.
Please mark Accept As Solution if my help has solved your problem.