[SOLVED] I'm looking for ALLDOCUBE Tablet 2 Pro repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my ALLDOCUBE Tablet 2 Pro. 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.

@Vittorio

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 ALLDOCUBE Tablet 2 Pro 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/612052/Which+SSD+upgrade+should+I+go+for
Take a look at comment #1414
Also, this : https://xdaforums.com/t/q-any-free-root-file-explorer-cant-buy-apps-here.798182/.
You can also check this video starting from minute 4:

The ALLDOCUBE Tablet 2 Pro 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 ALLDOCUBE Tablet 2 Pro 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 ALLDOCUBE Tablet 2 Pro 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 ALLDOCUBE Tablet 2 Pro 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/468025/How+to+recover+my+Sony+Experia+L+from+turning+off+and+on+repeatedly...

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

Liquid Damage: Using incorrect cleaning solutions or excessive liquid can lead to corrosion. Replacement Parts: New back covers, screen bezels, buttons, or full housing assemblies (if available and cost-effective). This can give you a clue about which internal component (e.g., near the CPU/PMIC, display driver, camera module) is likely causing it. Replacing this small, yet vital component is a common repair, requiring precision, the right tools, and an understanding of smartphone architecture. Traces: The fine conductive lines on the PCB can be corroded, causing open circuits. The consequences of SIM tray misalignment extend beyond mere aesthetics. While carefully applying new adhesive can significantly improve a phone's resistance to splashes and dust, it is exceedingly difficult to restore the device to its original, factory-calibrated IP rating without specialized equipment (such as pressure testing chambers) and OEM-level components. Customer Signature: The customer should sign a repair authorization form acknowledging the device's condition, the proposed repair, estimated cost, and the shop's terms and conditions, including data privacy and liability waivers. If you are comfortable opening your phone, carefully check the LCI stickers, usually found near the charging port, SIM tray, and under the battery. Some professional repair facilities use specialized pressure testing equipment to check for air leaks, but this is a rare and expensive setup. Aftermarket screens, especially cheaper ones, might have slightly different color profiles or brightness characteristics than the original. Ensure precise alignment, especially if there are specific cutouts or windows for the sensors. If the screen is severely cracked, covering it with packing tape first can help maintain its integrity during removal. Missing screws, especially conductive ones, can break critical ground connections. Replacing the charging port assembly (often a modular part) is a common fix. For Apple devices, a specialized "Tristar tester" can detect a faulty Tristar IC. If you suspect a specific trace, find a known good test point on either side of the suspected break using schematics. Mastering the art of glue and adhesive removal is a fundamental skill for any smartphone repair technician. Check Phone Placement: Experiment with placing the phone in different positions on the charging pad to find the "sweet spot." A burnt-out backlight IC often smells acrid and may have visible discoloration or a small hole. Professional-grade handheld cameras provide higher resolution, better sensitivity, and more advanced analytical features. Test with Different Callers: If distortion occurs with only one specific caller, the issue might be on their end (their phone, network, or microphone). Restart Phone: A simple reboot often resolves temporary software glitches. Before you even think about opening the phone, ensure these safety measures are in place: As a last resort for software-based issues, a factory reset (after backing up all data) can rule out deep software corruption. Provides magnified views for inspecting tiny components, reading markings, and performing micro-soldering with precision. Identifying genuine replacement parts for a specific smartphone model. You might need to remove a few small screws that secure any protective plates or brackets over the earpiece speaker module. Battery Connector: Ensure the battery FPC (flexible printed circuit) connector is firmly seated on the logic board. Some come in two parts (for the display and rear glass), so ensure you have the correct ones.

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