• 无法连接到Wifi；
• 无法使用运营商的网络语音通话；

只能通过移动网络上网，怎么办？

补充的情况是：

• 摔之前是Android 7.x，恢复原厂n次无效；
• 用移动网络流量硬生生升级到Android 8.0，问题依旧；
• Wifi开启时，能找到预设的热点，状态就是重复连接然后重复不成功；

求大神指点，谢谢！

English Version

After falling, the shell and the screen were not hurt too much, but from then on:

• Can not connect to Wifi;
• Can not use the China Unicom network voice calls;

Can only be through the mobile network, how to do?

The supplement is:

• Before the fall is Android 7.x, restore the original n times invalid;
• With mobile network traffic abrupt upgrade to Android 8.0, the problem remains the same;
• Wifi open, you can find the default hot spots, the state is repeated and then repeat the unsuccessful;

Seek the guidance of the great guy. Thanks!

⟐ Commented 八月 20, 2024 at 21:38 GMT-7

已經重置手機，恢復原廠設定，依然如此

⟐ Answered 六月 08, 2024 at 0:07 GMT-7

⟐ Answered 五月 04, 2024 at 16:29 GMT-7

⟐ Answered 四月 09, 2023 at 22:55 GMT-7

https://imgur.com/a/TBINwJ1

It was comfortable and I liked it very much for a while, but from one time on, I couldn't hold the outer screen at all. Even if it was closed, the inside was always on, and even if the notification came, the inside screen was glowing even though it was closed.

It does not fall or submerge, and if you try to forcefully start the sub-display using a fold switcher, the power will drop.

I tried to take a lot of logs with adb, but apparently the sub-display itself was not physically loaded. In addition, the part that normally reads the opening and closing and gives the angle is not displayed well. So I opened the inside once and tried to put it in again, but the symptoms have not changed....

In this case, will it be cured if I replace the sub-display with a flex cable? Or is it due to the disconnection of the internal flexible cable? For the time being, the battery on the sub-display side has been read, so I wonder if there is any disconnection of the flexible cable on the hinge.

If anyone is familiar with it, please help.

⟐ Commented 七月 25, 2026 at 18:23 GMT-7

⟐ Commented 七月 24, 2026 at 1:34 GMT-7

⟐ Answer accepted 七月 23, 2026 at 5:54 GMT-7

Distinctly unhappy with device.

Problem started after several years of good service when I tried to load Firefox browser.

⟐ Edited 七月 23, 2026 at 1:16 GMT-7

However, I cannot seem to find a guide for glass replacement only. Is there a chance I can get the original glass off without pulling out the whole screen first?

⟐ Answered 七月 22, 2026 at 14:38 GMT-7

Just a little bit ago, my music froze abruptly, and I had a solid five seconds of "Ah dangit, the wifi's out" before my phone shut off entirely and would not turn on. We're still at that point. Bluetooth earbuds are not connecting, indicating there is nothing going on inside my phone at this point & time.

I've attempted plugging it into my computer, with no discernable response, and the phone will not turn back on no matter how long I hold the power button.

I got a new case + screen protector & added each roughly a week ago-- not to say that's the issue, but I'm throwing it out there in case it contributes.

Any ideas as to how to get my phone up again?

⟐ Commented 七月 22, 2026 at 9:30 GMT-7

⟐ Commented 七月 18, 2026 at 2:46 GMT-7

⟐ Commented 七月 17, 2026 at 9:14 GMT-7

I replaced display (I was replacing displays many times in my life, so I have experiences with it) and it didn't help, still couldn't turn it on, nothing black screen, it doesn't even vibrate when I plug it into charger. So I disassembled it completely to see if there is not something damaged on the motherboard, everything looks normal, so I thought maybe charging port was broken when it felt on the ground, so I bought USB-C charging port replacement part from ifixit, replaced it and again didn't help.

There are some photos of my disassembled Pixel 4a 5G, maybe you can see something, or you can show me what could I try or measure with multimeter.

I tried to press top side button (power button) when battery was connected and when battery was disconnected too, didn't start, so battery should not be reason, because it doesn't start even without battery connected (just plugged through USB-C port).

I tried to connect it to powerbank too and powerbank was blinking so there should be some power draw to smartphone, I tried to even measure using multimeter voltage old and brand new USB-C charging port and I got some weird values like 0.2V, but I got something, I tried even measure voltage at battery connector port and got similar values, so there is flowing some current through board when plugged to charger.

Now I don't know how to continue :/

New battery replacement:

⟐ Answered 七月 16, 2026 at 20:04 GMT-7

**Symptoms:**

• Stays completely stable in Fastboot mode.
• When booting into Android, it either loops at the Google logo or reaches the home screen for ~10 seconds before crashing and restarting.(sometimes stays longer but then gets stuck for 10sec before crashing)
• Crashing is triggered by launching apps or high-load tasks.
• The issue has progressed from rare/random to guaranteed every time the phone boots.
• **Crucially:** The crashing happens even when the phone is connected to a wall charger.
• The battery percentage drains gradually to 0% and does not "jump" or drop suddenly from 20% to 0%.

**Steps Taken:**

• I have already tried flashing the official firmware using ADB and the Google Official Tool. The flash was successful, but the bootlooping and crashing persisted.
• Tried multiple chargers and cables.

Is it possible for a 4-year-old battery to cause this "voltage sag" crash even when plugged in and without showing typical "percentage jumping" degradation? Or does this progression point to a motherboard/PMIC failure?

⟐ Commented 七月 14, 2026 at 9:32 GMT-7

When I try to setup the Fingerprint Unlock android feature, I immediately get the following error on the Touch and hold the fingerprint sensor screen:

Fingerprint setup timed out
Fingerprint enrollment didn't work. Try again or use a different finger.

Things I tried but didn't fix the issue:

1. Ran the official repair app on: https://pixelrepair.withgoogle.com/carri... (after successfully pairing with my phone, the app displays an error stating that the software on my phone is newer than that of the tool and is unable to scan it).
2. Factory reset.
3. Re-opened the phone and double-checked the screen-to-frame connector.
4. Doubled-checked the sensor-to-screen connector (came installed but I disconnected and connected it back).
5. Downloaded and installed the Android USB driver for windows on my PC https://developer.android.com/studio/run...
6. Successfully ran the Update and Software Repair Tool on https://pixelrepair.withgoogle.com/udfps

None worked, however after doing point 6, the error message takes more time to appear.

Before the new screen I remember my screen would turn very bright white on and around the fingerprint sensor, now it doesn't.

I have the fingerprint sensor from my old screen ready to install on the new screen but before risking damaging the new screen, I thought I asked here:

Is there any other way to troubleshoot the fingerprint reader via software to be sure it's not working?

⟐ Commented 七月 10, 2026 at 2:10 GMT-7

Thanks

⟐ Answer edited 七月 08, 2026 at 21:35 GMT-7

That's the background. Since everything else on the phone appeared to be working, I thought it worthwhile to attempt a screen replacement and ordered the kit. I very slowly, meticulously, and carefully followed the instructions. Unfortunately, upon removing the old screen, I noticed a small amount of what appears to be very minor corrosion on the logic board next to the screen pins (see pics), so I gently cleaned it as best I could with alcohol and a Q-tip, then brushed it gently with a nylon brush, waited for it to dry completely, then installed the new screen. Sadly, even the new screen is still entirely black and even the touch doesn't work, even after re-seating a couple times.

Is there anything I've missed or should try before requesting an RMA? I'd love to get it working, but I can't think of anything else to try and finding a logic board, aside from being far more difficult to replace, is difficult to find and would change the entire device ID anyway. In other words, all my data is lost, and there is no longer a point in trying to recover it at that point. Fortunately, I was able to backup my data in the brief moments when the damaged screen was working prior to the repair.

⟐ Answered 七月 06, 2026 at 0:38 GMT-7

⟐ Answered 七月 03, 2026 at 10:36 GMT-7