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惠普 Chromebook维修指南。

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Please Help! There's Annoying Teal Blotches on Certain Colors

I’m not sure what this problem is or if anyone else has had this since I can’t find any results when I try and google. To be exact, on many colors (Mainly Red/Pinks, Oranges/Yellows, and just pastels) there will be blobs of teal, pixel-y static. It’s very annoying and I’ve tried clearing my files in case my storage was the source of the problem, however there is no difference. Any advice is welcome and appreciated and I hope I’m able to fix this problem soon.

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Hi @karip ,

What is the model number of the laptop?

Post some images in your question to show what you see. Here's how to do it on Ifixit 在已经存在的问题里加入图片

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@jayeff The model number is 11a-na0035nr! I'm adding the photos soon! Thank you for commenting and I apologize for the late reply.

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It appears after removing my teal blotched I now see green blotches on certain yellow colours

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@Ha Yoii

If you have a monitor with a USB-C DisplayPort you can connect it to the USB-C port on the right side of the laptop and check what its display is like..

That is if your laptop is similar to the HP Chromebook model as stated above.

Check the user manual for your model to see if an external display can be connected to it or not.

If there are no blotches on it, it is not a software problem but a hardware problem with the laptop's screen.

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@jayeff Most people with lower end machines like this don't have the monitors to support USB-C :(. It's more commonplace now, but 95% of the time when someone has a Type C monitor, they're running someone else's old $1k+ HP/Dell/Lenovo business class notebook/an older mobile workstation bought used for a fraction of the price, bought it new or have a high end workstation (Precision/Z/P series).

Like I said then, HP was looking to sell adapters. THEY KNOW these users aren't equipped for these monitors.

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Looks like a screen issue, but before going and replacing the screen hook the Chromebook up to an external monitor and make sure it isn’t the same there. This laptop lacks internal HDMI, so you need an adapter. You can get a USB-C>DP adapter (or straight USB-C), but neither DP or straight USB-C is a "common" option on "consumer grade" monitors -- you usually only find it on high end monitors from Dell, HP, BenQ and ASUS (gaming or PROART). For compatibility, the best way to test is with a USB-C>HDMI adapter. Your average monitor from Acer/HP/Dell/low-end Asus WILL OFTEN LACK USB-C OR FULL-SIZED DP.
Testing tip: You can sometimes see if someone has a high end display you can hook it up to for a brief test with the right cable, but these people aren't using Chromebooks; we use high end business class notebooks from HP and Dell, or mobile workstations (HP Z/Precision). NOT ALL OF IT IS, but a lot of our equipment is so good, you can usually bet on having things like DP or USB-C PD with video output. If I scored one and someone asked to test with it onsite, I’d be fine with it, especially if I had a USB-C/DP equipped HP Z, IPS Ultrasharp or LG IPS monitor like that. BUT I'd forewarn them these things run their Chromebook over in terms of color output performance with DCI-P3 or Adobe sRGB (95%+ color gamut) so the Chromebook will look washed out.

If the screen is bad, a lot of these Chromebooks use the same parts but you also will run into a issue with part cost vs. whole unit replacement due to how cheap a used equivalent Chromebook often is with major parts like screens - batteries and power jacks are less of a problem but anything major totals most Chromebooks out and pushes them into "BER" cost ranges.
However, you can always buy an identical (or at least, very similar) parts units with issues like a enterprise lock that the previous owner refuses to remove for these major parts - these cost almost nothing since they’re brick. For the Chromebook you have (HP ARM MediaTek), these use an iDP LCD; not an LVDS like Intel HP Chromebooks. THESE PANELS CANNOT BE INTERCHANGED. That said, a Dell or Lenovo donor may work (confirm the screen type first!!!) but it will have a Dell DP/N or Lenovo FRU, not an HP Spare#. You won't know on the outside anyway, though.

If you can’t find a donor, it looks like HP FINALLY abandoned LVDS on these MediaTek Chromebooks :-). This is excellent since iDP isn’t a nightmare to work with to replace a bad LCD like LVDS. As an example of why I don't mind kicking LVDS out and letting the door hit it -- I can put a Lat 7400 LCD in a 840 G5/G6 too, with a tab transfer -- couldn't do that on a LVDS E7440/E6440. They’re both standard implementations, but the connectors vary on LVDS so often you have to do a lot more research on compatibility - whereas iDP tends to just work. Skip the Intel models as donors, as many of them are LVDS :-(. HP Part# is M15719-001.

Tip: See if you can find a bare IPS panel from LG, Innolux, or AUO (If you can find it, a used/new Samsung LTN LCD panel -- LG IPS is king; Samsung is nearly as good). I did it with a Samsung IPS LCD (LTN) on my 6300U 840 G3 to replace the awful Innolux SVA display. My Lat 7490 came with the FHD LG IPS panel out of the box, and it’s even better then the Samsung LTN panel in my 840 G3. Samsung no longer makes normal LCD panels, so whatever is left is what we have then we need to move to LG or Innolux.

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Hi @karip,

If it turns out that the LCD panel is the problem, here’s the maintenance and service guide for the laptop series i.e. 11a-na0000, taken from this webpage that may help.

Go to p.28 to view the necessary pre-requisite steps and then the procedure to remove the LCD panel.

On p.11 Item #3 you will find the spare part numbers for the panel. Part # M15719-001 corresponds to the part number for your model variant. Click on Advanced(Unique Product S/N) and scroll down to Display

Search online using the part number only to find suppliers that suit you best.

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I still think a donor will be cheaper then the bare part :/.

Also this doesn't have internal HDMI :-(. WHY HP? USB-C displays are still firmly within the realm of pro grade like the Z displays! OP needs an adapter (HDMI is most compatible for many, but DP is an option). DP still falls there, but it's more common on higher end displays now at least.

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I just had this problem and I fixed it. It's not a part issue, it's all software.

How I got the problem: I tried enabling Linux but the installation didn't work, twice.

How I fixed it: I reset the Chromebook to factory settings.

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