[SOLVED] I'm looking for EXCEED EX8S1 Magna repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my EXCEED EX8S1 Magna. 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.

@Maria

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 EXCEED EX8S1 Magna 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/miuiwiz.1204181/
Take a look at comment #334
Also, this : https://www.ifixit.com/Answers/View/113753/Left+ear+bud+wont+play+music.+Where+can+I+fix+them.
You can also check this video starting from minute 8:

The EXCEED EX8S1 Magna 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 EXCEED EX8S1 Magna 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 EXCEED EX8S1 Magna 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 EXCEED EX8S1 Magna 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/Guide/IBM+ThinkPad+R40+Battery+Replacement/54601

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

Carefully reverse the disassembly steps, paying close attention to reconnecting all flex cables, replacing all screws, and re-securing any shielding. You can do this by holding an end in a blob of flux on your iron tip with some solder, letting the enamel burn off and the copper tin. While other issues can cause this, consistent, unpredictable freezes and reboots can point to RAM instability. Voltage Adjustments: For undervolting, decrease voltage in tiny steps. Now, use the plastic spudger, a plastic razor blade, or a fresh, IPA-dampened cotton swab to gently scrub and scrape the softened residue. As storage fills up, the operating system has less contiguous space to write new files, leading to fragmentation and slower access times. ESD Precautions: Electrostatic discharge can easily damage sensitive logic board components. The most critical step in restoring water resistance is the thorough removal of the old gasket and meticulous cleaning of the sealing surfaces. Carefully snap the antenna connector back into place, ensuring it's fully seated. A dirty or damaged connector can prevent proper signal transmission even if the flex itself is fine. A steady hand and good posture are also critical; even the best magnification tool won't compensate for a shaky hand. Battery drain will also be significantly accelerated, as the components work harder and less efficiently at higher temperatures. New Adhesive: Apply new adhesive strips to re-seal the display or back glass. This is a very advanced repair requiring micro-soldering skills and specialized diagnostic equipment. It's a high-reward repair when successful, restoring full functionality to an otherwise unusable device. Intermittent Responsiveness: The multi-touch functionality works sometimes but fails at other times, or in specific areas of the screen. This process not only restores clear audio quality but also helps in distinguishing between simple blockages and more complex internal hardware failures. Symptoms: Depending on the trace's function, symptoms can range from a non-functional camera, Wi-Fi, or charging port, to a completely dead phone. Watch through the microscope as the solder balls melt and "collapse" into place, forming solid connections. If initial checks don't work, the problem is almost certainly hardware-related. Background Activity Limits: Use Android's built-in battery optimization features. This gap allows the screen to vibrate against the frame or inner components, creating a buzzing sound. Screw Management: Keep track of all screws, as they often vary in size and length. Precision Tweezers (Fine-tip, Plastic or Metal): For prying and handling the ring. Zoom in on the photos to check for any anomalies like blurry spots, specks of dust, or glares that might indicate an issue with the installation or remaining debris. Disassembly: Carefully open the phone according to a specific repair guide for your model. Troubleshooting: Compare the observed current signature to known good ones. The phone's original frame might be slightly bent, warped, or twisted from a previous impact. These tiny specks, though seemingly minor, indicate a compromise in the phone's sealed display assembly or its structural integrity. Corrosion on Logic Board Components Adjacent to Screen Connectors: Water might have spread from the screen flex into the surrounding areas of the logic board.

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