[SOLVED] I'm looking for Huawei Honor Play 20 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Huawei Honor Play 20. It's started acting up, and I'm looking for a detailed service manual with boardviews and schematics to properly diagnose and repair it. I need to take precise voltage measurements around the board, so having the right documentation would be very helpful.

Thanks in advance for your help.

Selected Answer

I actually found that service manual on a tech Discord server a while back. A really helpful member there shared a direct link to their blog and I've saved it. I'm happy to pass it along here. Hopefully, these boardviews and schematics help you fix your phone, just like they got me through my repair. Looks like we have the same model.

@Frans

Absolute legend! That's exactly the info I was searching for. This is going to save me so much time probing in the dark. Seriously, thanks a ton for sharing the link!

Hi there,

I also have the Huawei Honor Play 20 and just downloaded the manual you shared. I'm pretty new to board-level phone repair, and this is a bit intimidating with all the tiny test points and the schematics. Could you point me in the right direction on how to start troubleshooting this ? Any advice on the first few things I should check would be a massive help.

Thanks so much for your time

General advices: start by checking the voltage at the battery connector on the board. With a known-good battery connected, you should see a steady voltage between 3.7V and 4.2V. After that, a great next step is to check the main power management IC (PMIC) for shorts. Using your multimeter in diode mode, check for shorts on the large input capacitors surrounding the PMIC.

Here are a few useful references for troubleshooting your device:
https://www.ifixit.com/Answers/View/799296/What+problems+see+from+the+picture
Take a look at comment #1576
Also, this : https://www.ifixit.com/Answers/View/489426/I+shattered+the+screen+on+my+iPhone+7.+Can+I+replace+it+with+a+6s+scr.
You can also check this video starting from minute 10:

The Huawei Honor Play 20 service manual and boardviews from the link above were exactly what I've been searching for. I couldn't find a complete, free copy anywhere else. Seriously, thank you for sharing this you're a lifesaver!

Hi everyone, I'm working on a Huawei Honor Play 20 with a no power issue and need some guidance with my measurements.
I'm detecting 3.3V on the VREG_MAIN line (pin 1 of the PMIC), which looks good, but I'm getting 0V on the VDD_CPU line (pin 8) where the schematics indicate I should see about 0.9V.
Since this is a core voltage for the application processor, could this missing rail be why the device shows no signs of life?
What's the best procedure to diagnose this further? Should I check for shorts on the CPU rail first, or look at the PMIC's enable signals?
I've already verified the main 3.3V and 1.8V power rails are present and stable.

My Huawei Honor Play 20 was working perfectly until yesterday when it suddenly went completely dead. Now it won't respond to the power button, doesn't vibrate, and shows no signs of life even when connected to a charger. I'm worried there might be a serious issue.

I have a decent multimeter, a basic soldering iron, and a healthy dose of patience. While I've successfully replaced iPhone batteries and charging ports, this will be my first attempt at actual diagnosis. The sheer density of BGA chips and microscopic components is honestly a bit overwhelming.

I'm particularly curious about the alcohol trick I've seen online where you apply isopropyl to the board and look for evaporation hotspots to locate shorts. Is this actually a reliable method for beginners, or are there better approaches I should try first with just a multimeter?

I learned this lesson the hard way last month with mine, it was declared "dead" by two different shops. The phone showed absolutely no signs of life - no charging indicator, no vibration, nothing. Before diving into complex board work, I decided to try one more basic test: wireless charging.

To my complete surprise, it actually heated up on the charging pad! This single discovery completely changed my diagnostic path. It turned out the issue wasn't with the main board or processor, but with the notoriously fragile USB-C port that had failed completely. A $15 replacement part and some careful soldering brought it back to life.

The moral? Always exhaust every external testing method before opening the device. Test wireless charging if available, try different charging methods, and don't assume the worst case scenario. Sometimes the most "dead" devices have the simplest solutions hiding in plain sight.

I suspect my issue might be related to that cheap, third-party fast charger I used at the airport last week... Now the device gets extremely hot during charging, the screen flickers at low brightness, and sometimes it randomly shuts down at 30% battery. Could this have damaged the power management IC or battery calibration?

If your Huawei Honor Play 20 starts acting up, random reboots, fast battery drain, or connectivity issues, there are several diagnostic steps you can take before assuming the worst:

• Check your charging habits: Using poor-quality chargers or wireless pads can gradually damage your battery and charging circuit, leading to unpredictable behavior.
• Inspect the physical components: A slightly damaged charging port, worn battery, or even accumulated pocket lint can cause issues that seem like major hardware failures.
• Monitor temperature patterns: If your phone gets unusually hot during specific tasks (like camera use or gaming), it could point to a failing component rather than a software issue.
• Use diagnostic tools wisely: Ampere for battery health, phone diagnostic codes (*#0*# on many models), and a thermal camera can reveal problems without opening the device.
• Know when to stop: If you see liquid damage indicators tripped or smell burnt electronics, it's time to consult a professional before causing irreversible damage.

Also visit this link it may help : https://xdaforums.com/t/deleted.1830725/

Here's what I discovered on forums and technical databases:

Capillary Action: Understanding how molten solder is drawn into small gaps by capillary action is crucial for both soldering components and removing solder with braid. On Android, check for system updates that might include carrier-specific configurations. Use a Schematic/Boardview: For advanced diagnostics, a schematic diagram and boardview software are invaluable. IPA (Optional, with caution): If debris is sticky, a tiny amount of 99% Isopropyl Alcohol on a cotton swab (ensure no strands are left behind) can help, but avoid over-saturating. Use Quality Chargers: Always use the charger that came with your phone or a certified, high-quality third-party charger. Trace Lines: These are thin strips of copper etched onto the PCB, forming electrical pathways. Usage Patterns: Heavy gaming, constant GPS use, or running demanding apps will cause more charge cycles and more heat, leading to faster degradation. Visible Moisture/Corrosion: Check speaker grilles, charging port, and screen edges for any signs of water ingress. Carefully insert a thin plastic opening tool or a specialized suction cup tool into a seam. Their ability to scan and list files confirms that the card's underlying flash memory is still somewhat functional, even if the file system is broken. Aim for Splash Resistance: The goal of replacing seals in a DIY setting should be to restore a reasonable level of splash or light rain resistance, not to make the phone truly submersible. Professional Diagnosis: For persistent, rapid drain (especially after a factory reset and with a new battery), or sudden drain in an otherwise healthy phone, suspect a motherboard short or faulty component. Water damage/Impact damage: These can cause various internal component failures leading to boot loops. Liquid Damage: Corrosion creating partial shorts or keeping components active. Small Component Rework: Similar to conical but with a slightly better heat transfer due to its flat edge. Heat Edges (Very Cautiously): If the display/back cover is heavily adhered, you may need to apply very low heat. Connect the multimeter between the phone's battery connector's positive terminal and the battery's positive terminal. Data recovery from a liquid-damaged smartphone storage chip is a last-resort, high-risk, and high-cost endeavor. Its constant interaction with cables makes it highly susceptible to physical wear and tear, leading to a myriad of charging and data transfer issues. However, keep in mind that a dry external LDI does not guarantee the absence of internal moisture damage, as liquid can sometimes seep in through other crevices without activating the readily visible indicators. Understanding its symptoms, causes, and systematic detection methods is essential for both general users and repair technicians. It can reveal internal breaks in traces or vias without destroying the board. A factory reset (after backup) might resolve this, but it's often more indicative of hardware. Factory Reset (Last Resort for Software): This is the ultimate software troubleshooting step. An old, degraded battery might seem to drain quickly, but it's not a true leakage current issue. If it's damaged or its connection to the motherboard is loose, signal integrity will suffer, making authentication difficult or impossible. It can bridge electrical pathways, creating unintended short circuits that damage components by forcing excessive current through them. ESD Precautions: Always work in an ESD-safe environment to prevent further damage. Damaging the Cable: The coaxial cable itself is delicate; avoid bending or pinching it excessively. Repairing a malfunctioning smartphone power button, while requiring careful disassembly and meticulous attention to detail, is a highly effective DIY repair.

@Manuel, Not sure what you're trying to say but ok :)