[SOLVED] I'm looking for Samsung SM-N960N Galaxy Note9 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Samsung SM-N960N Galaxy Note9. 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.

@Alejandra

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-N960N Galaxy Note9 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/xperia-t-increase-headset-volume.2629774/
Take a look at comment #96
Also, this : https://www.ifixit.com/Answers/View/828087/ECAM+22.110+with+barely+any+water+coming+through.
You can also check this video starting from minute 10:

The Samsung SM-N960N Galaxy Note9 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-N960N Galaxy Note9 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-N960N Galaxy Note9 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-N960N Galaxy Note9 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/s7-edge-big-problem.3446270/

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

Sometimes, only a portion of the screen might work, or colors might appear inverted or incorrect. Toggle Airplane Mode: Turn on Airplane Mode for about 30 seconds, then turn it off. Component Isolation: If possible, and if you have spare parts, try temporarily replacing the GPS antenna module (if it's a separate component) or the flex cable it's integrated into. Case or Screen Protector Interference: A poorly fitted phone case or screen protector can press against the button, making it appear stuck or unresponsive. If you factory reset the device without removing the associated Google account, the phone will ask for the credentials of that account after the reset. This can sometimes reveal app-specific issues rather than hardware ones. Symptoms: "OEM unlocking" option is grayed out in Developer Options, `fastboot oem unlock` command fails, or the device gets stuck during the unlock process. Corrosion: Look for any signs of liquid damage or corrosion on the motor or its connector. Adhesive: If adhesive is present, gently apply a small amount of heat to the external side of the frame where the sensor is located to soften it, then carefully push the sensor out from the inside with a spudger. Recent Trauma: Has the phone been dropped, bent, or subjected to any significant physical impact recently? A sudden appearance of Wi-Fi issues immediately after such an event strongly points to hardware damage, including antenna detachment. Perform a factory reset (after backing up data) to rule out all software-related drains. Open the Device & Disconnect Battery: Follow a reputable repair guide specific to your phone model. Charging IC/USB Controller IC: The integrated circuit responsible for managing USB communication and power delivery can fail. Move the hot air nozzle in a circular motion, ensuring even heat distribution. Lifting Pads (Soldered Modules): Too much force during desoldering or inadequate heat can rip pads off the board, making repair much harder. Other functions not working (e.g., charging port, microphone): Since the headphone jack is often part of a multi-component flex, if other functions fail, recheck all connections on the new flex cable. This step is very risky and should only be attempted if you are confident in your dexterity and understand the risk of permanent damage. Tweezers (ESD-safe, fine-tipped): For handling small screws and delicate flex cables. Remove the Case: If you're using a thick or poorly ventilated case, remove it and see if the temperature improves. The goal is a thin, uniform layer that covers the entire contact area of the IC. No Cellular Signal or Extremely Weak Signal: The most prominent symptom. Safety Precautions: UV light can be harmful to eyes and skin, and prolonged contact with uncured glue can cause skin irritation. Once the shields are removed, use a plastic spudger to carefully disconnect the display, digitizer, and any other flex cables connecting the screen assembly to the motherboard. Backup Data (if possible): If the phone occasionally boots normally, back up any crucial data to a cloud service or computer. Identify the Connector: Locate the press-fit connector on the logic board. Ventilation: Work in a well-ventilated area, as some solder masks may emit fumes during curing. Locate the GPS Antenna and its Connections: Use your repair guide to pinpoint the exact location. It functions as a dedicated, highly specialized processor, distinct from the phone's main Application Processor (CPU). Inspect the Wi-Fi antenna, its connectors, and the Wi-Fi module for physical damage or corrosion. Flex Cables: Inspect the flex cable that connects the camera module to the logic board.

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