[SOLVED] I'm looking for SPC Gravity 2 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my SPC Gravity 2. 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.

@Monica

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 SPC Gravity 2 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/583786/How+do+I+replace+the+drive+belt+on+my+riding+mower
Take a look at comment #1135
Also, this : https://www.ifixit.com/Answers/View/717553/Issues+with+A+Series+Samsung+Screen+Replacements.
You can also check this video starting from minute 3:

The SPC Gravity 2 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 SPC Gravity 2 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 SPC Gravity 2 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 SPC Gravity 2 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/setting-up-a-new-sd-card-as-internal-storage-on-lineageos.3593403/

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

While in Safe Mode, go to `Settings > Apps` (or `Apps & notifications`). Baseband IC and associated components: Prone to failure in some models due to design or thermal stress. B-7000 or similar adhesive / Pre-cut adhesive strips (optional): For resealing the phone to maintain dust and water resistance. It might be directly attached to the display assembly’s flex cable, or it could be a small, separate component located near the front camera and sensors. Examine New Bezel: Inspect the new bezel for any defects or damage before starting. JTAG/SWD Debuggers: These are standard interfaces for low-level debugging and programming of microcontrollers. When to seek professional help: If oxidation is severe, if your cleaning attempts are unsuccessful or seem to worsen the situation, or if you suspect internal damage (e.g., the port is loose, or there's internal heat), it's best to consult a professional repair technician. Apply heat for 15-30 seconds, maintaining a distance of a few inches, ensuring the glass is hot to the touch but not excessively so. Lag / Delay in Response: There's a noticeable delay between touching the screen and the device reacting. The BMS is typically integrated onto a small flexible printed circuit (flex cable) that is attached directly to the battery cell and then connects to the phone's main logic board. For external grilles, use a soft, dry toothbrush to gently brush out debris. If you know you are sensitive to flickering lights (e.g., fluorescent lights, old CRT monitors), you are more likely to be sensitive to OLED PWM flicker. This could be a programmable NFC sticker, a smart business card, a loyalty card with an NFC chip, or a public transport card. Exceeding these limits can cause irreversible damage to the transistors and internal circuitry. Security Type: Ensure the router's security type (WPA2-PSK AES, WPA3, etc.) is compatible with your phone. If file system repair or cache wipe didn't work, the corruption might be deeper. For USB-C, internal damage or debris can affect digital audio output; cleaning is the first step. Observe the solder balls under the microscope as they melt and 'snap' into place. Be gentle: Excessive force can worsen the problem or damage other components. Broken Tray: Plastic trays can crack or snap, particularly if a cheap, ill-fitting SIM adapter is used, or if excessive force is applied. You might have to systematically check each major power line and then progressively narrow down the faulty branch. Logic Board (Motherboard): This is the main PCB, the brain of the phone. Container for Disposed Battery: A sand-filled bucket or a fire-resistant bag/container to safely transport the removed battery. Fine-Tip Soldering Iron (if replacing SMD mic): For fine-pitch soldering. Most modern smartphones either open from the back (by removing the back cover) or from the front (by carefully removing the display assembly). Always work away from delicate flex cables or exposed electronic components. A stereo microscope is not merely an accessory but a fundamental requirement for advanced smartphone board diagnostics and repair. Accurate diagnosis is paramount before attempting a jumper wire repair: Acrylic (AR): These are popular due to their ease of application, fast curing, and excellent moisture resistance. Back-Opening (Back Cover Removal): Similar to front-opening, but start prying the back cover.

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