[SOLVED] I'm looking for SUPRA M622G repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my SUPRA M622G. 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.

@Fabio

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 SUPRA M622G 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/727609/I+keep+getting+error+about+dirt+on+anti+drop+sensor.
Take a look at comment #787
Also, this : https://xdaforums.com/t/help-with-installing-dynamic-s3-style-rom-on-xperia-u-sd-card-mount-problem-no-sd.2106444/.
You can also check this video starting from minute 1:

The SUPRA M622G 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 SUPRA M622G 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 SUPRA M622G 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 SUPRA M622G 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/usb-host-via-mhl.1456880/

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

Fuses blow for a reason (an overcurrent or short circuit elsewhere in the line). Debris Ingress: Dust, lint, or liquids can get into the switch mechanism, causing stickiness or malfunction. Symptoms typically include intermittent charging (the phone charges only at specific angles or stops charging if slightly nudged), a charging cable that doesn't feel secure, or the phone failing to charge altogether. These tools can initiate a "re-pairing" or "calibration" process that authenticates a new OEM-supplied fingerprint sensor with the Secure Enclave. Never use metal tools for prying a swollen battery, as they can easily puncture it. This voltage should be significantly higher than battery voltage (e.g., 15-30V) when the backlight is supposed to be on. The multimeter is arguably the most indispensable diagnostic tool for any electronics repair technician, and smartphone repair is no exception. ALS Module/Flex Cable: The ambient light sensor is often part of a larger flex cable assembly that includes the proximity sensor and sometimes the front camera or earpiece. Data Wipe: The unlocking process itself nearly always triggers a factory reset for security reasons, wiping all user data from the device. Corroded Pads/Springs: Look for green, white, or dark residue on both the spring contacts and the pads. A new ceramic back replacement part: Ensure it is of high quality and compatible with your specific smartphone model. Carefully align and re-seat the display assembly, ensuring all display flex cables are connected if you disconnected them. Safely removing this broken glass is a precision task that requires careful technique to prevent further damage to the camera module itself or to the phone's internal components. Replacement Micro-USB Port/Flex Cable: Ensure it's compatible with your specific phone model. Removing a stripped pentalobe screw is a frustrating but often necessary step in smartphone repair. Fine-tipped Soldering Iron: For cleaning pads, pre-tinning, and minor touch-ups. Before diving into hardware replacement, it's essential to rule out software issues, which are often the culprit. Immediately after gaining access to the phone's internals, locate the battery connector (usually a small flex cable clipped onto the logic board). Once connected and powered on, the first observation is the standby current. Advanced diagnostic software typically falls into several categories, each with its own strengths and use cases: Using a schematic and multimeter, check for the presence of all required voltages to the Baseband IC and Baseband PMIC. Light Mode: If you primarily use dark mode, some burn-in patterns might be less obvious. Reinstall Components: Systematically reinstall all the components you removed: logic board, battery, speakers, cameras, shields, screws, etc. Incorrect Component Transfer: Failing to transfer all necessary components can result in non-functional features (e.g., Face ID, auto-brightness). Apply Clamps (for adhesive cure): Use phone clamps or rubber bands to apply gentle, even pressure around the edges for at least 3-4 hours (for adhesive strips) or 12-24 hours (for B-7000 glue) to allow the new adhesive to cure properly. Many replacement display assemblies come as a complete unit (screen and digitizer, sometimes with a new frame). Bent, broken, or missing pins: Common if the flex cable was inserted incorrectly or forced. Dust, Dirt, Smudges: A layer of grime, dust, or even a persistent smudge on the screen directly over the ALS can block light. Even if used to "restore" a genuinely corrupted original IMEI, the legal status can be ambiguous and risky if not done via official channels. Schematics will show the fuse's location (component designator like F1001), value (e.g., 1A, 0.5A), and the lines it connects.

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