[SOLVED] I'm looking for Xiaomi Mi 5c repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Xiaomi Mi 5c. 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.

@Holly

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 Xiaomi Mi 5c 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://xdaforums.com/t/need-some-assistance.3706622/
Take a look at comment #1210
Also, this : https://www.ifixit.com/Guide/How+to+Replace+the+Back+Panel+Adhesive+on+Your+Google+Pixel+4+XL/155237.
You can also check this video starting from minute 2:

The Xiaomi Mi 5c 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 Xiaomi Mi 5c 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 Xiaomi Mi 5c 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 Xiaomi Mi 5c 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://www.ifixit.com/Answers/View/384949/iPhone+5s+No+power+cpu+hot+after+water+damage

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

Correction: The OIS controller then activates tiny electromagnetic actuators (or sometimes piezoelectric motors) that physically shift the camera lens or sensor module in the opposite direction of the detected shake. If the "Update" option doesn't resolve the issue, or if you need a truly fresh OS install, you'll need to use the "Restore iPhone..." button. The power distribution system also includes various protection circuits. Faulty Apps: A recently installed or updated app might have a bug that causes conflicts with the system. Final Test: Power on the phone and perform a thorough test of the proximity sensor and all other functions. Reconnect the Battery: Once all internal components are transferred and secured, reconnect the battery flex cable. If call quality improves in Safe Mode, a recently installed or misbehaving app is likely the culprit. The causes of magnetic sensor anomalies can be broadly categorized into external interference, software calibration issues, and hardware failure. The primary adhesive seal is invariably broken or stretched beyond reuse. When your phone goes silent for these crucial functions, it can be incredibly disruptive. Intentional Entry: Sometimes, users intentionally put their device into EDL mode to perform deep-level repairs or bypass certain bootloader restrictions, and then fail to exit properly. Review and disable notifications for apps that don't require immediate alerts. Do not spray continuously, as this can force debris deeper or introduce moisture. Enhanced Safety (Marginally): The gel-like electrolyte is less prone to leakage and can be slightly more stable than liquid electrolytes in certain failure scenarios, though still susceptible to thermal runaway. If the problem persists after exhausting all software remedies, or if there are clear physical signs, the issue is almost certainly hardware-related, warranting professional attention.8. For other Android (non-Samsung): You'll typically use ADB and Fastboot tools. Clean the Area: With the old sensor removed, thoroughly clean the area beneath it. Ignoring ESD protection is akin to playing Russian roulette with your smartphone's internal health.9. Quick Settings/Control Center: First, try toggling the flashlight on/off using the dedicated shortcut in your phone's quick settings panel (Android) or Control Center (iOS). Thin Metal Pry Tool (e.g., iSesamo, metal spudger): For initial entry into the adhesive gap. Dry Thoroughly: Use compressed air or allow ample time for the IPA to evaporate completely before reassembling. If display appears externally: The phone's core functions are fine, and the issue is definitely with the phone's internal display assembly or its immediate connection. Wear Safety Gear: Put on safety glasses and gloves to protect your eyes and hands from glass shards. Battery Drain: If radios are constantly struggling to find or maintain a signal due to interference, they will consume more power, leading to rapid battery depletion. Magnification: A jeweler's loupe (10x-30x), a digital microscope, or a stereo microscope is crucial. The backlight circuit is usually located near the display connector on the motherboard. Always check seller ratings, read reviews, and be skeptical of exceptionally low prices. IR Blaster: (Less common now) For controlling TVs and other appliances. Locate and Access the Charging Port Assembly: Identify the flex cable or small PCB that houses the micro-USB port. Alignment: Carefully align the new adhesive gasket to the frame or component, ensuring it sits perfectly within the designated channel without overhangs or gaps.

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