[SOLVED] I'm looking for NABI 2 Disney Edition repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my NABI 2 Disney Edition. 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.

@Ebrahim

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 NABI 2 Disney Edition 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/560781/Replace+display,+what+glue
Take a look at comment #1464
Also, this : https://xdaforums.com/t/temporary-solution-for-camera-crash-on-kitkat-roms-might-fix-other-issues.2579990/.
You can also check this video starting from minute 5:

The NABI 2 Disney Edition 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 NABI 2 Disney Edition 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 NABI 2 Disney Edition 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 NABI 2 Disney Edition 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/Guide/Samsung+Older+French+Door+Refrigerator+-+Freezer+Defrost+High+Limit+Thermostat+Test+and+Replacement/178089

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

Third-Party System Monitor Apps: Apps like GSam Battery Monitor (which also shows app memory usage) or basic system monitor apps can give you an overview of RAM utilization. The precise location and access method for the Taptic Engine can vary significantly between smartphone models. After flashing, try to enter recovery mode again to see if the menu now appears. Loudspeaker: Difficulty hearing the other party on speakerphone, or quiet/unclear ringtones and media playback. Research the Method: Search for known unlock methods for that specific device. Inspecting these shields is an important step in diagnosing certain smartphone issues and ensuring proper functionality after repairs. Keep track of all screws, noting their original positions as they can vary in size and type. For severe liquid damage or if manual cleaning fails, an ultrasonic cleaner is highly effective. Some smartphone OEMs include hidden diagnostic menus (e.g., dialer codes like #0# for Samsung) that can test various hardware components, including memory. Check Mobile Data: Test mobile data connectivity by browsing a webpage or sending a message. Knowing the typical locations of key components helps in narrowing down the source of heat: If not, power off, disconnect the battery, and recheck all connections. Only after exhausting these avenues should you suspect a hardware fault. Conflicting Applications: Third-party apps, especially those poorly coded or incompatible with the OS, can cause system instability, crashes, and performance issues. Test Charging: Before fully reassembling the phone, carefully place the logic board back into the frame, connect the battery, and plug in a charger. This can lead to a loose or rattling motor, muffled vibrations, or even the motor failing to vibrate altogether if its electrical contacts are compromised. Cleanliness: Keep your workspace clean and dust-free to prevent debris from getting into the phone's internals. Heat gun or hair dryer: To soften adhesive holding the back cover or screen, if applicable. Many replacement display assemblies come as a complete unit (screen, digitizer, and sometimes frame), but you often need to transfer small components from the old display to the new one. Energy Storage: Inductors store energy in a magnetic field when current flows through them. These are primarily used in display refurbishment, specifically for bonding the digitizer/top glass to the LCD or OLED panel. Repairing a damaged motherboard pad is one of the most challenging micro-soldering repairs. High Demand for Affordable Repairs: Consumers often seek the cheapest repair options, creating a market for low-cost, low-quality parts. If the new PMIC is not pre-balled, you will need to "reball" it using a BGA stencil, solder paste, and hot air to create new solder balls on its underside. Repeat for Each Button: Test the power, volume up, volume down, and any other buttons on that flex. Identify Tool & Firmware: Determine the correct flashing tool for your specific phone model and download the official stock firmware (ROM) package corresponding to your device's exact model number and region. Fortunately, recalibrating the digital compass is usually a straightforward software process that can restore accurate orientation. For very small components, a fine-tip soldering iron can also be used. Other causes include using incorrect firmware for the specific device model or region, corrupted firmware files, interruptions during the flashing process (e.g., power loss, disconnected cable), using unofficial or incompatible flashing tools, or attempting to rollback a highly customized firmware (e.g., custom ROM) without proper knowledge. Mastering the art of handling these fragile connectors is a hallmark of a skilled technician.

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