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Huawei P9 Display Replacement Issues: Unresponsive Touch on Left-to-Right Movement

mst16222 4548 19
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Why does a Huawei P9 replacement display fail to register touch when swiping left-to-right in one-handed use, while the original screen works normally?

The replacement displays are most likely defective or incompatible, so they should be returned/claimed; the original screen works normally, while all the Chinese substitute panels showed the same touch problem, which points to the replacements rather than the phone [#17277461][#17317757][#17321847] One reply also noted that parts near the LCD connector on the motherboard can affect touch and can be damaged during disassembly, but the later tests with the original display and multiple replacement screens make the replacements the stronger suspect here [#17311317][#17317757] Another user reported the same kind of issue after replacement, including missing knuckle gestures, which reinforces that these aftermarket P9 assemblies can be problematic [#17321846]
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  • #1 17277430
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    I bought two displays from China factory assembled with frames.

    Both have the following problem: when the phone is held with one hand and tries to pan / scroll the screen to the left (i.e. left to right movement of the thumb pad), the touch does not respond at all, or it responds the tenth time - literally.

    When I hold the phone with both hands, the problem does not occur.

    It is definitely not the fault of the motherboard, because I checked on both phones and it is the same on both

    I recorded a video below:
    https://www.youtube.com/watch?v=sTe98LDtTsA&feature=youtu.be

    Is it my fault or the displays are clearly for complaint?
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    #2 17277461
    minek95
    Level 14  
    Posts: 112
    Help: 10
    Rate: 21
    Displays to be returned, do not buy those in frames because they come off later
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  • #3 17277475
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    Thanks

    Where would you suggest to buy? On the Allegro only Krzymark looks reasonable when it comes to the display for this model

    (others are 96% positive) ...
  • #4 17277644
    milosz998
    Level 10  
    Posts: 86
    Help: 1
    Rate: 3
    I have exactly the same thing, the screen started to peel off, it's a pity to talk.
  • #5 17277648
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    As I understand it, there will be no problem with the return since the fault is evident. On aliexpress they play heavily on the customer, so it should be ok with acknowledgment of the dispute I assumed. I added a description along with a video
  • #6 17277699
    minek95
    Level 14  
    Posts: 112
    Help: 10
    Rate: 21
    The problem begins when a dispute can no longer be opened ;) And so always either the seller will return or just the same
  • #7 17277703
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    But I have already opened a dispute :D
    If someone has a link to an auction where I could buy a functional display, I would be grateful
    Today Krzymark looks the best - a lot of positives with a relatively small number of negatives
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  • #8 17277770
    daro19862
    Level 25  
    Posts: 1728
    Help: 26
    Rate: 166
    I recommend the Krzymark company, there was never a problem with them.
  • #9 17297330
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    I got a reply from ali that I was to show the complete LCD installation on video. So far I have sent them with the motherboard and battery connected and it is not enough for them.

    Only now I have a problem - if I have to record the complete installation, I have to tear off the red protective tapes from the frame received from the seller. Can I have a problem with the return afterwards?

    They offered me a return to the seller at my expense (shipping price to China - PLN 70) - what side should I pay for the seller's error, which sends three pieces of left displays that do not meet the basic functions?

    https://www.youtube.com/watch?v=SXu5it3FnTU&feature=youtu.be

    I would be grateful for a suggestion on what to do about this. They gave me 3 days ...
  • #10 17297337
    minek95
    Level 14  
    Posts: 112
    Help: 10
    Rate: 21
    You can send back by registered priority mail, it will be about PLN 25 from what I remember. Record how you connect the other one you bought and then the one from them and that it does not work.
  • #11 17311083
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    I have the following problem:

    The displays from Krzymark work perfectly. However, there must be something wrong with the motherboard. I have two P9s:

    in one of them, the phone turns on after pressing power on and vibrates, but no image appears on the display.

    I thought it was a display problem, but I connected this LCD to a second one and the image is displayed very correctly.

    The part of the motherboard that I marked in red in the attachment becomes very warm after 5 seconds, and even hot after a minute. I cleaned the entire Cleanser motherboard with print (isopropanol), applied a new thermal grease and the symptom is the same - the phone turns on, but there is no picture.

    I also cleaned the contacts on the motherboard from the connector to which the IPA display plugs.

    What could it be ? Thanks in advance...
    Attachments:
    • Huawei P9 Display Replacement Issues: Unresponsive Touch on Left-to-Right Movement Bez tytułu.png (419.14 KB) You must be logged in to download this attachment.
  • #12 17311238
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    SECOND PROBLEM

    I am begging you for help what's going on .... This is a catastrophe and total hopelessness. First, I was taking Allegro displays from GSM_Parts and the problem was the same as in the first post. Then came the arts from aliexpress - the same.

    Eventually, for the third time, I took the LCD from Krzymark and the problem IS THE SAME.

    I don't understand it at all what this is about ? Do I have any crooked fingers / my skin has degenerated that such circuses are happening?

    When I hold the phone with my right hand and scroll from right to left (i.e. the display scrolls to the right) - no problem. When I scroll with the same right hand from left to right (ie I want the menu windows to move to the left - the display / touch does not respond, but when I change my hand to the LEFT hand, the problem is the opposite.

    MIRACLES ON KIEJ.

    What this is about?!?!?!?!!?! I feel like I'm banging my head against the wall, $$ are flying, and the problem is not solved ... I wasted a lot of time on it ....

    Video: :
    https://www.youtube.com/watch?v=4VyxQqf_8vQ&feature=youtu.be

    Please help me VERY MUCH - I lost two months of time and a lot of money trying to solve this .... three different salespeople and the same problem ... Whatt the fu .... ## ck ...?
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  • #13 17311317
    plustek
    Level 31  
    Posts: 1427
    Help: 176
    Rate: 200
    Look at the glue-drenched parts above the LCD connector, the extreme ones in the upper right corner are responsible for the touch. Watch it under a microscope, it can be easily damaged by improper disassembly.
  • #14 17311448
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    Are you talking about the motherboard?
  • #15 17311914
    plustek
    Level 31  
    Posts: 1427
    Help: 176
    Rate: 200
    Yes, there are elements responsible for e.g. for the touch.
  • #16 17311931
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    But there is immediately a large metal plate / cover above the display connector
    Ps. The problem is the same on the second motherboard ...
  • #17 17317757
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    Sorry plustek, but you're wrong. There is a metal casing above the LCD connector. It is very difficult to damage it, especially since I operate with spudgers and I do not force anything.

    The original compact display is like a dream. The problem was with Chinese substitutes. Three different sellers, yet each acted the same.

    The touch works great on the original ...
    https://www.youtube.com/watch?v=ZZcSBzkZ3qc

    Does anyone have a link to some display replacements for P9 what to avoid such circuses?
    Alternatively, how much does it cost to replace the glass in the original broken display?
  • #18 17321058
    arcodan1972
    Level 10  
    Posts: 7
    Rate: 1
    Hello. I have another problem. I replaced the display and colored stripes appear in the left corner, you cannot scroll from top to bottom.
    Best regards and thanks for all the info.
  • #19 17321846
    rafallos5
    Level 12  
    Posts: 55
    Help: 4
    Rate: 22
    I have the same problem in my P9 after replacement, I ordered a lcd from Bydgoszcz. It's maybe not as bothersome as u mst16222 , but apart from that, I noticed that the "knuckle" functions, such as screen after double-tapping, do not work.
  • #20 17321847
    mst16222
    Level 6  
    Posts: 48
    Rate: 6
    The original works perfectly

    Replacements as above.

    Apparently, there are no efficient replacements for this model
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Topic summary

✨ The discussion revolves around issues with Huawei P9 display replacements, specifically unresponsive touch functionality during left-to-right scrolling when held with one hand. Users report similar problems with multiple displays purchased from various sellers, indicating a potential defect in the replacement parts. Recommendations include returning the faulty displays and sourcing replacements from reputable sellers like Krzymark. Some users have successfully resolved issues with original displays, while others continue to experience problems, including display peeling and touch sensitivity failures. Concerns about the return process and shipping costs to China are also raised, alongside inquiries about the functionality of original versus replacement displays.
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FAQ

TL;DR: 2 replacement P9 screens failed to register left‑to‑right swipes; "Both have the following problem," especially one‑handed. With two hands, it works; across two phones, the fault persisted. [Elektroda, mst16222, post #17277430]

Why it matters: This FAQ is for Huawei P9 DIY repairers facing unresponsive touch after a display swap and needing clear fix/return guidance.

Quick Facts

Why does my Huawei P9 not register left-to-right swipes after a display swap?

This pattern points to a faulty replacement digitizer. Users saw left‑to‑right swipes fail one‑handed, yet two‑handed use worked. The same behavior across two phones ruled out the motherboard. Replace the panel with a vetted unit or test an OEM screen. [Elektroda, mst16222, post #17277430]

Is it the display or the motherboard causing the touch issue?

If an original P9 display works perfectly while multiple replacements fail, the display is at fault. One user confirmed flawless touch on OEM and repeat failure on substitutes from different sellers. That isolates the problem to the replacement panels. [Elektroda, mst16222, post #17317757]

Should I buy a P9 display "with frame"?

Avoid framed assemblies reported to peel later. As one expert put it, "Do not buy those in frames because they come off later." Choose quality glass+LCD without the pre‑glued frame, and use proper adhesive methods. [Elektroda, minek95, post #17277461]

Who is a reliable seller for P9 screens?

Several users vouch for Krzymark for this model. "I recommend the Krzymark company, there was never a problem." Always verify current feedback and return terms before ordering. [Elektroda, daro19862, post #17277770]

How do I document a faulty touch panel for an AliExpress dispute?

Support asked for a complete installation video; a board‑only test was rejected. Do this:
  1. Film the full LCD install, not just connectors on a bench.
  2. Power on and clearly show the failed left‑to‑right swipe.
  3. Submit the video within the dispute’s deadline. [Elektroda, mst16222, post #17297330]

Who pays for return shipping on a faulty AliExpress screen?

In the reported case, the platform offered a return to the seller at the buyer’s expense, quoted around PLN 70. Confirm costs and carrier options in your dispute before shipping. [Elektroda, mst16222, post #17297330]

What’s a cheaper way to return a faulty screen to China from Poland?

One user returned by registered priority mail for about PLN 25. Use tracked post, keep receipts, and upload tracking in the dispute. [Elektroda, minek95, post #17297337]

Does grip or hand orientation affect this touch bug?

Yes. One user saw right‑hand swipes left‑to‑right fail, yet the opposite failed when using the left hand. Two‑handed operation felt normal. That inconsistency signals a defective digitizer matrix, not software. [Elektroda, mst16222, post #17311238]

Which motherboard parts can kill touch on the P9?

A tech advised inspecting glue‑covered parts above the LCD connector. "The extreme ones in the upper right corner are responsible for the touch. Watch it under a microscope." Physical damage there can break touch. [Elektroda, plustek, post #17311317]

My P9 vibrates, warms near the LCD area, but no image appears. What does that indicate?

The same display showed image on another phone, so the panel is fine. Heating on the marked motherboard area with no image suggests a board‑level fault. Seek board diagnostics or component repair. [Elektroda, mst16222, post #17311083]

After replacement, the P9 "knuckle" gestures stopped working. Why?

A user reported that feature stopped after installing a non‑OEM screen. Some replacements do not support Huawei’s gesture firmware set. Test gestures during inspection and consider OEM panels. [Elektroda, rafallos5, post #17321846]

I see colored stripes in the corner and can’t scroll vertically after replacement. Is the panel bad?

Yes, those artifacts and lost vertical scroll indicate a defective or damaged replacement. Replace the display again under warranty or refund. [Elektroda, arcodan1972, post #17321058]

Are multiple faulty aftermarket P9 screens common?

One case documented 3 out of 3 replacements from different sellers with the same left‑to‑right swipe failure. That rate signals significant quality variance; source parts carefully. "For the third time, the problem is the same." [Elektroda, mst16222, post #17311238]

Can I test the screen without fully installing it?

A bench test with motherboard and battery connected was not accepted as proof. The platform requested a complete installation video to validate the defect. Plan to film a full fit if you intend to dispute. [Elektroda, mst16222, post #17297330]

Do OEM P9 screens avoid this touch issue?

Yes in the case reported. The original compact display "is like a dream," while substitutes from three sellers showed the fault. That supports choosing OEM or high‑grade refurb. [Elektroda, mst16222, post #17317757]
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