[SOLVED] I'm looking for Samsung SM-N910U Galaxy Note repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Samsung SM-N910U Galaxy Note. 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.

@Gabriele

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 Samsung SM-N910U Galaxy Note 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/824772/What+type+of+battery+is+used+in+these+headphones
Take a look at comment #1394
Also, this : https://www.ifixit.com/Guide/Logitech+Harmony+Smart+Control+Hub+Light+Bulb+Replacement/51749.
You can also check this video starting from minute 3:

The Samsung SM-N910U Galaxy Note 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 Samsung SM-N910U Galaxy Note 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 Samsung SM-N910U Galaxy Note 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 Samsung SM-N910U Galaxy Note 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/boot-loader-seems-to-have-vanished-after-upgrade.218484/

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

EMI Shielding: Electronic components, especially high-frequency ones (Wi-Fi, Bluetooth, cellular modem, CPU), generate and are susceptible to electromagnetic interference. Is there dirt, grime, or a case interfering with their movement? Use a fine tool (like a toothpick) or compressed air to clean around the buttons. If the input voltage significantly exceeds this (e.g., above 5.5V-6V, depending on the design), the OVP circuit activates. In some Android phones, it might be integrated into a larger component assembly or located elsewhere. This method significantly mitigates the risks associated with traditional high-temperature desoldering, safeguarding the integrity of sensitive integrated circuits (ICs) and the surrounding components. Known Good Display Assembly: A shorted display can sometimes prevent boot-up. Usage: Connecting internal antenna cables (often thin, flexible coaxes) to the motherboard. Freezing spray can temporarily cool a suspect chip, sometimes allowing it to function normally for a brief period, confirming it as the culprit. Corrosion/Liquid Damage: Green or white residue on contacts or antenna elements indicates liquid damage, which can disrupt continuity. For technicians, mastering the intricacies of baseband repair represents the pinnacle of smartphone repair expertise, demanding precision, specialized tools, and a deep understanding of device architecture.6. Reduce Thermal Shock: Gradually brings the entire board (and all components) to a uniform temperature, minimizing stress and preventing damage (like warpage or component popcorning) from rapid heating. Start recording and slowly pan the phone horizontally, then vertically. Remove SIM/Factory Reset (for some brands): Some manufacturers (e.g., Xiaomi with its Mi Unlock tool) might require removing the SIM card or performing a factory reset before the unlock process can begin. The secure folder feature on smartphones, exemplified by Samsung's Secure Folder, provides a robust, encrypted space for sensitive applications and data, separate from the main user environment. "Bricked" Device: If your phone is already unbootable, data recovery becomes a much more complex and often expensive process, potentially involving specialized data recovery services that work directly with storage chips. This guide will clarify the diverse functions of internal plastic shielding, detail the necessary tools and precautions, and provide a comprehensive, step-by-step process for its proper replacement. Phase 2: Detailed Inspection of the Display Connector (Motherboard and Flex Side) Ensure the ultrasonic cleaner is properly grounded and follow all electrical safety guidelines. Third-party Repair Tools: Some advanced third-party tools can read component IDs and verify basic compatibility, but they are not as comprehensive as OEM tools. Gently disconnect the flex cable (if not already loose) by prying upwards with a plastic spudger. Connect the positive lead of the DC power supply to the shorted power rail (e.g., a test point or a capacitor on that rail). A damaged Power Management Integrated Circuit (PMIC), often referred to as the "charging IC" or "power IC," is a critical and complex hardware fault in a smartphone. This guide will walk you through the process of diagnosing and fixing a smartphone that displays a "software update failed" message. After the shield has cooled, clean the entire area thoroughly with isopropyl alcohol and a soft brush to remove all flux residue. Third-Party Touch Test Apps: Search app stores for "Touch Screen Test" or "Pressure Test" apps. The intricate world of smartphone micro-repair demands more than just steady hands and specialized tools; it necessitates the ability to see what the naked eye cannot. You might find options to make the display "cooler" (more blue) or "warmer" (more yellow/red). Use DCV mode to check these if the board is powered, or diode mode if unpowered, comparing to KGB. Perform the test with different USB cables and computer ports to rule out external factors. By following these steps, you can often successfully restore your smartphone's analog audio capabilities, saving you the cost of a new device or the inconvenience of adapters.## 6.

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