[SOLVED] I'm looking for ORANGE P350X Sego 8 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my ORANGE P350X Sego 8. 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.

@Eliane

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 ORANGE P350X Sego 8 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/234693/contact+manager+has+stopped
Take a look at comment #1295
Also, this : https://xdaforums.com/t/backup-ta-partition.3849106/.
You can also check this video starting from minute 10:

The ORANGE P350X Sego 8 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 ORANGE P350X Sego 8 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 ORANGE P350X Sego 8 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 ORANGE P350X Sego 8 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/gyroscope-doesnt-work-in-in-pubg-mobile.3841450/

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

Remove SIM Tray: Use a SIM ejector tool to remove the external SIM card tray (and microSD tray if applicable). Debris: Check for lint, dust, pocket fluff, crumbs, or any foreign objects obstructing the port. Intermittent Issues: Loose connectors are prime suspects for intermittent problems. BGA Reballing Stencil: A thin metal mask with holes matching the BGA chip's pad layout. Place them evenly around the perimeter, ensuring not to overtighten and crack the screen. Application: Ideal for general cleaning of logic boards, flex cables, and connectors to remove light contamination, dust, and fingerprint oils. You might need to disconnect and remove the main rear camera module(s) to access the flash. Users might notice this even when the phone is simply sitting on a desk or in their pocket. Prying Too Deeply: Once a gap is created, inserting a pry tool too deeply can easily damage the LCD/OLED panel, backlight, or internal flex cables. Observe if light from the phone's backlight or an external light source (shone through the gap from the side) is visible through the crack. Loose Connection: Re-open and carefully check every single connector, especially the small antenna coaxial cables. Start by aligning one edge (often the top near the cameras or earpiece). No Current Draw: If there's no current draw and the phone doesn't boot, an open coil in a critical power path could be the culprit. Observing someone else perform the disassembly and button replacement will provide the best visual aid. If the screen is severely cracked, covering it with packing tape first can help maintain its integrity during removal. Clean the Sensor Area Externally: Before opening, thoroughly clean the top part of the screen where the sensor is located. Remove these screws, keeping them meticulously organized, and carefully pry off the shield to expose the internal components. As the solder melts, the connector should settle perfectly onto the pads. Inspect and replace door seals/gaskets as needed to maintain an airtight seal. EIS Settings: Ensure EIS is enabled in camera settings if your phone supports it. For heavily corroded boards, you might do multiple cycles, checking progress in between. Eccentric Rotating Mass (ERM) Motor: A small motor with an unbalanced weight that spins rapidly to create vibrations. Gentle Tightening: Tighten screws until snug, but avoid overtightening, which can strip threads or damage components. Reduced Signal Strength: Especially in areas with already weak signals, a compromised antenna cover might slightly hinder the antenna's performance, leading to weaker cellular, Wi-Fi, or GPS signals. Gentle Lift: Once the solder balls underneath the chip melt (indicated by a slight shimmer or movement), gently lift the chip using fine tweezers. Partial Reassembly for Test: After replacing the component, reconnect the battery and temporarily re-seat the screen/back cover. Check Capacitors/Resistors Around IC: Many capacitors around the Charging IC act as filters or voltage dividers. Charging Port: Phone doesn't charge with known good cables/chargers, or only charges at a specific angle. Grounding: Ensure all grounding points for the antenna are making good contact (e.g., metal spring pins contacting the antenna flex). For Android users, the ability to reinstall or "flash" the operating system is a powerful tool, providing a lifeline for bricked devices, a path to cleaner performance, or even a way to update an aging phone.

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