[SOLVED] I'm looking for Zte nubia RedMagic 7 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Zte nubia RedMagic 7. 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.

@Muriel

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 Zte nubia RedMagic 7 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/Guide/Lenovo+Yoga+700-11ISK+LCD+Replacement/72382
Take a look at comment #751
Also, this : https://www.ifixit.com/Guide/Eufy+RoboVac+11S+Swivel+Wheel+Replacement/167174.
You can also check this video starting from minute 4:

The Zte nubia RedMagic 7 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 Zte nubia RedMagic 7 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 Zte nubia RedMagic 7 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 Zte nubia RedMagic 7 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/149849/Is+PS4+working+with+SATA+III+SSD

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

Avoid Physical Pressure: Don't put heavy objects on your phone, or press hard on the screen with sharp objects. Online Retailers: Amazon, eBay can be good for basic sets, but be wary of very cheap, low-quality tools. Damaged Microphone Flex Cable: This is perhaps the most frequent cause. Fully charged or fully discharged states are detrimental for long-term storage. Lines on the display: Often vertical or horizontal lines, especially near the bottom of the display where the COF flex connects. Solder Reinforcement (Optional): For fine-pitch connectors, it might be beneficial to carefully touch the individual pins with a fine-tipped soldering iron after the hot air reflow to ensure strong, isolated connections and to correct any minor bridges that might have formed. Insurance: Have comprehensive business insurance that covers customer property. Excessive wind noise: The foam might not be dense enough or not properly seated. Damage to Adjacent Components: Hot air can easily dislodge or damage small surface-mount components (resistors, capacitors) situated close to the shield. It ensures the new component functions optimally, guarantees customer satisfaction, and upholds the reputation of the repair technician. Corrosion: As the liquid dries, it leaves behind residues (minerals, sugars, chemicals) that become electrolytes. If you prefer not to remove it entirely, ensure you provide clear instructions or the passcode to the technician. Inspect the actual antenna element (often a small PCB, part of the frame, or a sticker antenna). Examine the Charging IC and PMIC (and components immediately surrounding them: coils, capacitors, resistors) for: A short circuit on a smartphone motherboard is one of the most serious and potentially destructive issues a device can face. They often have dedicated troubleshooting guides, firmware downloads, and tools for resolving update issues. Install New Battery: Install a new, high-quality replacement battery using fresh adhesive. While the immediate symptoms of a damaged shield might not always be apparent, its critical role in EMI/RFI suppression and potentially heat management makes its proper replacement essential for the long-term reliability and optimal performance of a smartphone. An "OL" (open loop) reading indicates a broken trace within the flex cable. Ensure no small surface-mount components (resistors, capacitors) were accidentally blown away by airflow or dislodged. Apply new adhesive if the replacement part doesn't come with pre-applied adhesive (B-7000 glue or specialized double-sided tape is often used). Magnifying Glass/Jeweler's Loupe: For inspecting tiny components for corrosion. Liquid damage is one of the most common and devastating ailments a smartphone can suffer. Opening a sealed smartphone without damage requires specific, non-marring tools. Integrated into Mid-frame/Housing: On many phones, the plastic antenna covers are integrated into the mid-frame (the internal plastic structure) or the main metal frame, often visible as strips on the top and bottom or sides. Damaging Other Flex Cables: The interior of a smartphone is packed with delicate flex cables. Computer Not Recognizing Phone: The phone might not be recognized by a computer when connected via USB, or it may constantly connect and disconnect. Technical Expertise: A thorough understanding of smartphone architecture, firmware flashing, and potentially command-line interfaces. Plastic Spudgers and Guitar Picks: For large, softened blobs, a thin, rigid plastic spudger or a guitar pick can be used to carefully lift and peel away the softened glue. They act as your phone's personal black box recorder, continuously monitoring various system parameters, capturing critical information in the moments leading up to a failure, and providing the digital breadcrumbs needed to trace the root cause.

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