[SOLVED] I'm looking for ONYX Boox Go 10.3 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my ONYX Boox Go 10.3. 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.

@Jessie

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 ONYX Boox Go 10.3 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/486830/Why+won't+my+Asus+connect+to+the+internet
Take a look at comment #245
Also, this : https://www.ifixit.com/Guide/Aquasana+F-300R+300000+Gallon+Whole+House+Water+Filtration+System+20-Inch+Sediment+Pre-Filter+Replacement/153794.
You can also check this video starting from minute 2:

The ONYX Boox Go 10.3 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 ONYX Boox Go 10.3 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 ONYX Boox Go 10.3 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 ONYX Boox Go 10.3 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://www.ifixit.com/Answers/View/532333/I+just+replaced+my+battery,+how+do+I+condition+the+new+battery

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

These are often the first components to check, as they are common points of failure. Once aligned, press down firmly and evenly across the entire surface of the back panel, especially along the edges. Water Damage Repair: Cleaning corrosion with isopropyl alcohol, and potentially replacing affected components (can be complex). Use a heat gun or hair dryer on a low setting, moving it consistently around the perimeter for 30-60 seconds to soften the adhesive. Software (the operating system, camera app, and third-party flashlight apps) provides the interface and control logic. Position it precisely in the original location, ensuring the sensor cutouts on the flex align perfectly with the corresponding openings or windows on the phone's frame or display. Pay particular attention to functions affected by transferred components, such as wireless charging, NFC functionality, and the fingerprint sensor. Most commonly, this involves a path between a voltage line and ground. Correct Tools: Have the appropriate precision screwdrivers, thin plastic prying tools (spudgers), suction cups, and heat gun (if needed for adhesive). Their location varies by manufacturer but commonly found in the SIM card tray slot, charging port, headphone jack, or under the battery (if removable). If compressed air doesn't work, use a clean, soft-bristled brush (e.g., a toothbrush). Distinct from the main PMIC, a faulty Charging IC is a common cause of charging issues or even battery drain. Battery Disconnection: Once the display or back panel is partially opened, locate the battery connector. Despite their advantages, BGA chips are susceptible to specific failure modes that often necessitate rework: Antivirus/Firewall: Temporarily disable antivirus software or firewalls on your computer, as they can sometimes interfere with device detection. Fine-Tip (Angled): Useful for reaching components in tight spaces or gripping items from an angle. Locate the battery connector on the motherboard (often secured by a metal bracket) and gently pry it upwards with a plastic spudger to disconnect it. Flux residue, if left on the board, can become corrosive over time and attract moisture, leading to future problems. For many modern smartphones, this involves carefully heating the edges of the display to soften the adhesive that secures it to the frame. Proprietary Tools: Access to legitimate, updated service software is tightly controlled by manufacturers. The thermal paste would then be between the shield and the cooling element. IPA is excellent for dissolving corrosion and evaporates quickly without leaving residue. The primary suspect in this scenario is often the Power Management IC (PMIC) or a dedicated charging IC (sometimes referred to as Tristar/Hydra for Apple devices or similar charging controllers in Android). Do not attempt this without specialized equipment and training, as you risk destroying the entire logic board. Capacitors: Used for input and output filtering and smoothing the boosted voltage. They display real-time voltage (V), current (A or mA), and sometimes wattage (W) and accumulated charge (mAh). However, it is fraught with potential risks, and if not executed correctly or if manufacturer safeguards are triggered, it can lead to severe device malfunction or even render the phone unusable. Board Repair for Specific Issues: In certain cases, particularly with specific models or known vulnerabilities, a transplant might be employed to fix a persistent boot loop or a general non-booting state that has been diagnosed as a faulty CPU or memory component, especially if a new motherboard is unavailable or too costly. Continue holding the shield steady with tweezers until the solder cools and solidifies. If already damaged: Never try to "fix" a cable that is already torn, creased, or has visible nicks.

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