[SOLVED] I'm looking for CONQUEST S10 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my CONQUEST S10. 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.

@Jérôme

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 CONQUEST S10 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-z1c-new-user.2843986/
Take a look at comment #1100
Also, this : https://www.ifixit.com/Answers/View/723365/My+keyboard+has+a+problem.
You can also check this video starting from minute 5:

The CONQUEST S10 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 CONQUEST S10 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 CONQUEST S10 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 CONQUEST S10 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-a-samsung-galaxy-quattro-win-gt-i8552-official-firmwares-for-different-regions.2908817/

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

Position New PMIC: Carefully place the reballed (or pre-balled) new PMIC onto the pads on the motherboard. Smartphones utilize a variety of internal antennas, often integrated into the device's frame, mid-frame, or as separate flex cables. Schematic and Boardview Analysis: Essential to identify the specific chip, its function, and pinouts to guide diagnosis and repair. Once the back cover or display is removed, you will typically see the battery, often secured by adhesive strips or a frame. Replacing the entire display is the most common, and often only, DIY solution. Faulty USB-C Port/Cable Detection Circuitry: Modern USB-C ports have complex detection circuits to determine cable orientation, power delivery, and data transfer. Mastery of this process elevates a technician's capabilities significantly.4. This bracket is often plastic or metal and might be secured by screws or adhesive. Method 1: Hot Air Rework Station (Recommended for Most Smartphone Shielding Cans) Battery Health: Modern smartphones have built-in battery health indicators in their settings. If it's safe to do so (i.e., no immediate shorting hazards), momentarily connect the battery and attempt a brief power-on. Identify Coil: The wireless charging coil is usually a large, flat, sometimes circular or square, black or grey sticker-like component. You should hear a continuous beep, indicating a low-resistance path to ground. Its primary role is to manage power delivery, authenticate chargers and accessories, handle data communication over USB, and regulate the charging process of the battery. Solder Joint Integrity: For phones that have been dropped, microscopic inspection of the solder joints under RF ICs and their surrounding components can reveal micro-cracks. It could be a simple software glitch, a blocked speaker grille, or a more involved hardware failure of the speaker module itself. Repair and Disassembly: Any repair that requires separating the SoC from its heatsink (e.g., motherboard removal, mid-frame replacement) necessitates cleaning off the old paste and applying fresh paste during reassembly. If multiple are tripped and there's clear corrosion, its accuracy is high. If a voltage is missing or incorrect, trace its path backward on the schematic to find the source (usually an IC) or a fault along its line. Using a soft, dry, clean toothbrush or a fine-tipped brush, gently brush away any visible debris. However, many blown fuses show no external signs of damage, requiring electrical testing. This software glitch or minor hardware malfunction often results in the phone's internal speakers being disabled, making it impossible to hear calls, media, or notifications unless headphones are actually connected. If both stock and third-party apps exhibit AF issues, the problem is likely deeper. Light bleed around the edges of the display is another common symptom, where the backlight escapes through the gap. Always consult a specific repair guide or video for your exact phone model, as disassembly procedures vary greatly. It requires meticulous attention to detail, a gentle touch, and an understanding of the specific vulnerabilities of these innovative but delicate designs. Schematics and Boardview Software: Invaluable for identifying components, test points, and tracing signal lines on the logic board. This advanced diagnostic process moves beyond simple visual inspections to explore the electronic pathways and control logic responsible for power delivery. You can use specialized phone repair clamps or, as a simpler alternative, stack a few heavy books on the phone while it lies flat. Hold it perfectly still, applying light pressure, and allow the glue to cure completely (this can take several minutes to hours depending on the glue).

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