[SOLVED] I'm looking for AOC A17 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my AOC A17. 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.

@Seth

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 AOC A17 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/857672/Tidak+bisa+di+isi+daya+-+Cannot+be+charged
Take a look at comment #811
Also, this : https://www.ifixit.com/Answers/View/378319/Dash+lights+and+tall+lights+not+working.
You can also check this video starting from minute 4:

The AOC A17 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 AOC A17 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 AOC A17 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 AOC A17 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/help-camera-not-installed-on-kitkat.2542699/

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

Schematics and Board View Software: Crucial for identifying the DAC's location, orientation, and surrounding components. Go to your sound settings and test the vibration (e.g., by enabling vibration for touch feedback, or triggering a test notification). Soft-bristle brush: A clean, unused toothbrush (medium or soft bristles) or a specialized anti-static ESD brush. iCloud Photos: For photos and videos, enable iCloud Photos in `Settings > [Your Name] > iCloud > Photos`. Review each account and disable automatic sync for services you don't need constantly updated. In such cases, the "antenna band" might refer to a small daughterboard or a flex cable that connects to these frame elements. If the phone detects the new S Pen, your original S Pen might be faulty (though this is less common for detection issues related to the slot itself). "Accessory Not Supported" / "This accessory may not be supported" (iOS): This is a classic warning displayed on iPhones and iPads when a non-MFi certified or faulty Lightning cable is used. Razor Blade (EXTREME CAUTION): Use only as an absolute last resort, with a very shallow angle, and only on robust metal frames, never near flexible cables or delicate plastic. Gently heat the edges of the rear panel with a heat gun or hair dryer to soften the adhesive. Power off, disconnect battery, and carefully re-examine the sensor's alignment with its window on the display/frame. This can resolve deep-seated software corruption but comes with significant data loss (always back up first). Risk: Can easily glue the screw in place if not removed at the right time. Screen Assembly: If the display glass is shattered, or the LCD/OLED panel itself is damaged, the digitizer might be collateral damage, and the entire screen assembly would need replacement. No Backlight: The BLU circuit might be completely shorted or damaged, resulting in a display that shows content only if you shine a strong light through it. It might be lightly adhered to the frame; use a plastic spudger to gently pry it up. Before diving into specific shapes, understanding the underlying principles of tip selection is vital: For smartphone rework, a low-temperature leaded paste (e.g., Sn63/Pb37) is often preferred for easier reflow, or a lead-free paste if strict environmental compliance is required. Once software is ruled out, inspect the physical condition of the phone, focusing on the speakerphone area (often the main bottom-firing speaker). Replacing the primary communication modem IC, often referred to as the baseband IC or cellular modem, is one of the most challenging and intricate repairs on a smartphone motherboard. Extreme caution is advised: Always test on an inconspicuous area first, as some can damage specific plastics or coatings. A "software update failed" message on a smartphone can be incredibly frustrating. Bottom Microphone: This is usually the main microphone used for standard phone calls and sometimes for voice recording. Locate Battery Adhesive Tabs: iPhones typically use black adhesive pull tabs underneath the battery. When a charging port breaks, the phone may stop charging entirely, charge intermittently, or only at specific angles, severely limiting its usability. Motherboard: Once all screws and connectors are detached, gently lift the motherboard out of the old housing. Gather Tools: BGA rework station, stereo microscope, specialized eMMC/UFS chip-off reader/adapter (with appropriate sockets for the chip's package type), precision tweezers, vacuum pickup tool, fine-tip soldering iron, flux, solder wick, IPA, BGA stencils (if reballing). You can also use a new, dry, soft-bristled toothbrush or a wooden toothpick to very gently dislodge anything. For optimal adhesion and to restore some level of water/dust resistance, apply sustained pressure to the phone for several hours using specialized phone clamps or by placing it between heavy, flat objects. Disconnect any flex cables attached to the back cover (fingerprint sensor, wireless charging coil).

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