[SOLVED] I'm looking for Huawei Honor 5X LTE repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Huawei Honor 5X LTE. 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.

@Ayse

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 5X LTE 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/q-cm9-vs-cm7.1412336/
Take a look at comment #1063
Also, this : https://www.ifixit.com/Guide/Epson+Powerlite+410W+Lens+Replacement/148367.
You can also check this video starting from minute 7:

The Huawei Honor 5X LTE 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 5X LTE 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 5X LTE 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 5X LTE 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/gauges.2117999/

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

Within these firmware packages, the kernel (often named `boot.img`) and various driver libraries are embedded. Screw Extraction Kit (Micro-Size): Specialized kits with tiny drill bits that can reverse-thread into a stripped screw. Once sufficiently heated, carefully insert the molybdenum wire between the cracked outer glass and the display panel. Transfer Components (if necessary): Depending on your replacement screen assembly, you may need to transfer some components from the old screen to the new one. Once a faulty IC (e.g., PMIC, charging IC, specific capacitor) or a shorted component is precisely identified, it needs to be replaced. Then, solder the other side, applying a tiny bit more solder if needed to ensure a good joint. Intermittent Functionality: Often a loose connection or minor damage to the flex cable. OIS (Optical Image Stabilization) Failure: If images are consistently blurry despite good lighting and steady hands, the OIS mechanism within the camera might be broken. Lines or Distortions: Incorrect pixel addressing or signal interference. Diagnosing inconsistent battery percentage readings requires patience and a methodical approach. Manage Expectations: Be transparent with customers about the limitations of Touch ID/Face ID repair outside of authorized service centers. Forgetting to Remove Protective Films: The pads won't work if the films aren't removed. This is generally beyond DIY repair and would necessitate professional board-level repair. Remove Old TIM: Gently scrape off old thermal paste with a plastic tool, then clean the area thoroughly with IPA and a lint-free cloth. This indicates a permanently closed switch or a short circuit on the flex. Board Holder/Jig: To securely hold the logic board in place, preventing movement during soldering. Attached to the Battery: Some older models integrated it into the battery sticker itself. Gray (around 50% brightness), light blue, or light green are excellent choices because they provide a neutral canvas where faint afterimages are most easily discernible. Depending on how the contacts are integrated, you might need a replacement antenna flex cable, a specific sub-board, or even a section of the mid-frame that includes the contacts. Store flat or gently coiled to avoid sharp bends or kinks, which can damage internal traces. If the repair was successful, the display should now show a clear, correct image. If you are not comfortable with intricate electronics repair, it is highly recommended to seek professional assistance. Carefully slide the tool around the perimeter, gradually separating the screen from the mid-frame. Look for distributors with certifications (e.g., ISO, RoHS compliance for parts). IPA helps dissolve some types of adhesive, especially when combined with heat. Audio Artifacts During Specific Operations: Distortion or glitches appear only when performing certain actions (e.g., during calls, while recording, or using specific apps). Temperature-Controlled Soldering Iron: With a very fine tip (e.g., chisel tip 0.5mm, conical 0.3mm) for soldering the individual pins. Test the button after cleaning to see if its responsiveness or stability has improved. Place the tip of the spudger underneath the circular connector and gently pry it straight up. Slide and Pry: Once a small gap is created, insert a plastic pick to hold it open.

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