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

Hi,

I'm hoping you can help me out with my MLS Way. 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.

@Janet

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 MLS Way 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/q-jellybam-rom-not-booting-in-nexus-s.2102103/
Take a look at comment #1356
Also, this : https://xdaforums.com/t/oneplus-6-qualcomm-crash-dump-even-after-msm-tool.4696809/.
You can also check this video starting from minute 5:

The MLS Way 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 MLS Way 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 MLS Way 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 MLS Way 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/q-purple-screen-everywhere-what-it-is.1930592/

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

Disable these enhancements temporarily to see if the audio clarity improves. Sometimes, the trace leading to the missing pad can be extended, or an adjacent via (a plated through-hole connecting layers of the PCB) can be utilized if the schematic confirms its connectivity. Residue Removal: All traces of old adhesive, dirt, and debris must be meticulously removed from both mating surfaces (frame and display/back cover). For instance, if one SIM is set to "LTE/CDMA auto" and the other to "GSM/WCDMA auto," ensure both are appropriate for the respective carriers. This clears temporary system files without deleting your personal data. For enthusiasts who venture into the world of custom ROMs, the ability to modify and control their smartphone's software environment is empowering. Essential for stubborn adhesive on back covers, displays, and some batteries. Divide the data into overlapping intervals of increasing length (`τ`, the averaging time). The frustration of a smartphone that refuses to charge when powered on, yet dutifully fills its battery when completely shut down, is a peculiar and surprisingly common issue. Cases: Some thick or metallic phone cases can interfere with GPS signals. For instance, a wider gap near a screw that seems flush, or a tight gap near a screw that appears misaligned, suggests tension or improper seating. But sustained, heavy workloads, such as graphically intensive gaming, generate continuous heat. Incompatible Parts: Aftermarket screens might have different transparencies for IR light (proximity sensor) or subtly altered cutouts. The most critical step in hardware diagnosis is testing with a known-good replacement display , this immediately tells you if the problem is the screen itself or something deeper on the motherboard. The camera lens itself is a delicate component and should not be touched directly. Around the perimeter of the back glass or back cover, bonding it to the mid-frame or chassis. Before performing a factory reset, ensure all your data is backed up, as this process will wipe everything from the device. This step is critical; any residue will prevent the new coating from bonding properly. Without a functioning OVP, a faulty charger or power anomaly could catastrophic damage the device. It involves removing all traces of old adhesive, debris, and inspecting for any physical deformities. Manufacturers often release updates that include sensor calibration improvements or bug fixes. A good motor should show a very low resistance reading (typically between 8 to 50 ohms for ERM, LRAs can vary). It's the critical interface between the phone's antenna and the baseband processor, responsible for amplifying, filtering, and switching RF signals for cellular communication (2G, 3G, 4G, 5G). Protective tape (Kapton or painter's tape): To shield surrounding areas. Beyond simply taking photos, consider using image editing software to annotate and label key areas in your images. For smartphone work, a typical digital storage oscilloscope (DSO) with a bandwidth of at least 100MHz is recommended, preferably with multiple channels to compare signals simultaneously. Accidental damage to these cables is often irreparable without specialized equipment and can necessitate an expensive screen replacement. Battery Degradation: An old or failing battery can generate excess heat during charging and discharging cycles. With careful attention to detail and a good specific guide for your phone, you can successfully perform this repair.5. Internal Dimension (Inner Jaws): For measuring the inside diameter of holes, cutouts, or the internal dimensions of housings where components fit.

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