[SOLVED] I'm looking for Infinix S5 APAC repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Infinix S5 APAC. 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.

@Hatem

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 Infinix S5 APAC 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/i9100g-died-because-of-re-partitioning.1992304/
Take a look at comment #1130
Also, this : https://www.ifixit.com/Answers/View/361527/Where+can+I+find+a+replacement+battery.
You can also check this video starting from minute 2:

The Infinix S5 APAC 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 Infinix S5 APAC 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 Infinix S5 APAC 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 Infinix S5 APAC 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/replacement-phone-feels-loose-in-case.1178195/

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

macOS/Linux: In the Terminal, type: `./flash-all.sh` (you might need to grant execute permissions first with `chmod +x flash-all.sh`). SIM Card Reader Module: In many smartphones, the SIM card reader is a separate module connected to the logic board via a flex cable or integrated directly onto a sub-board (like the charging port flex). The underlying problem is the interruption of electrical pathways, preventing signals from reaching their destination. Minute Components and Pads: Smartphone logic boards feature extremely small ICs, resistors, capacitors, and contact pads. The button combination usually involves holding Power + Volume Down simultaneously while starting the phone (release once you see the Fastboot screen or a similar prompt). Flex Cables: Disconnect all flex cables from the motherboard (cameras, charging port, buttons, display, etc.). Physical Damage: Bent pins on the display connector, cracked components (small black ICs, capacitors, resistors), signs of burning. Locate Display Connector: The display assembly connects to the motherboard via a flex cable, usually secured with a small metal bracket and screws. LCD Assembly: Some screens have the proximity sensor built into them, or a plastic guide that directs light. Power Amplifiers (PAs): These components boost the signal strength for transmission. Ensure the solution is warm (if the unit has a heater) but not excessively hot, as extreme heat can sometimes delaminate circuit boards or affect component integrity. Remove the Earpiece Speaker: Carefully remove any retaining screws or brackets. Ensure the conductive side of the tape makes firm contact with a ground point on the logic board or the metal frame of the phone. As always, back up your important data regularly, especially before attempting any factory resets or major system changes. New adhesive strips (optional but recommended): If you need to reseal the phone. If it works perfectly without the case, the case is the problem, not necessarily the coil alignment (though the case exacerbates any minor misalignment). A common failure for inductors is physical cracking or internal disconnection after a drop. Update Software: Ensure your phone's operating system is up to date, as updates often include bug fixes for connectivity. Fine-Tip Soldering Iron (Temperature Controlled): Essential for precision work. A stuck volume button can be an annoying impediment to your smartphone experience. Ensure all grounding contacts (e.g., spring contacts, screws, metal clips) are clean, corrosion-free, and making firm contact. If screen auto-rotation is unresponsive, it could be the accelerometer or gyroscope, or both. Systematically uninstall recently installed or suspicious apps to identify the problem. If possible, test it by connecting its flex cables to the motherboard without fully installing it, then reconnect the battery and power on the phone to check for display issues, touch response, and proper colors. Speakers (Earpiece and Loudspeaker): The tiny mesh grilles covering your speakers are designed to protect the delicate drivers inside while allowing sound to pass. If using pre-cut adhesive strips: Carefully peel and apply the new adhesive strips around the perimeter of the phone's frame, ensuring all edges are covered. Gently pull up while inserting a thin plastic prying tool or opening pick into the gap created. These indicators are crucial for manufacturers and repair technicians to assess warranty claims and diagnose water damage. RF (Radio Frequency) / Baseband: Deals with cellular, Wi-Fi, Bluetooth, GPS signals. However, this aesthetic choice comes with a significant fragility trade-off: a dropped phone frequently results in a shattered rear glass panel.

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