[SOLVED] I'm looking for REZONE A240 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my REZONE A240. 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.

@Thomas

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 REZONE A240 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/q-flashed-rom-s-still-have-same-issue.3096158/
Take a look at comment #681
Also, this : https://xdaforums.com/t/post-666.1594648/.
You can also check this video starting from minute 9:

The REZONE A240 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 REZONE A240 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 REZONE A240 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 REZONE A240 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/662990/The+guides+are+missing+the+part+where+you+put+back+the+back+cover

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

Apply Flux: Apply a thin, even layer of flux to the cleaned pads on the logic board. Look for signs of liquid damage (corrosion, white residue) on the PCB traces and components immediately surrounding the connector. Automatic Sync: Disable automatic syncing for accounts (email, cloud services) you don't need constantly updated. Check Headphone Jack (if applicable): Sometimes, a phone can get "stuck" in headphone mode even when headphones aren't plugged in. RF (Radio Frequency) Transceivers and Amplifiers: Components related to Wi-Fi, Bluetooth, cellular radios can generate significant heat. Consider discounting, bundling, or safely disposing of them to free up space and capital. Force Stop/Clear Cache: For persistent ALS issues, try clearing the cache of the "Adaptive Brightness" or "System UI" app, or even clearing the system cache partition (via recovery mode). By following the simple steps and appreciating the thoughtful design, anyone can successfully maintain and extend the life of these innovative devices.4. If replacing the charging port flex cable and battery doesn't resolve the "device not charging" message, the problem likely lies with components on the motherboard itself. Align the flex cable connector perfectly with its receptacle on the logic board or component. For BGA ICs: If using low-temp solder paste, apply a small bead around the edges of the IC. High Component Density: Components are packed tightly, increasing the chance of an ESD event propagating to multiple parts. In rare cases, the phone's internal thermal sensors might be faulty, providing incorrect temperature readings to the system, leading to inappropriate charging behavior (e.g., pausing charging too soon) or failing to trigger thermal throttling when actual overheating occurs. Removing a broken screw from a smartphone housing is often a test of patience, dexterity, and problem-solving. Look for any internal components that might be pressing against the back of the screen assembly. If the phone now functions normally off the charger, then the original battery is the culprit. Wear Wrist Strap: Put on the ESD wrist strap, ensuring it makes good contact with your skin. Poor Design: Some smartphone models inherently have less effective thermal management systems. Recognizing the signs of infection and knowing how to effectively remove malware is essential for maintaining the security, privacy, and performance of your smartphone. Under the microscope, inspect the pads for any damage, such as lifted, torn, or missing pads. Using your microscope, carefully place the new sensor onto the solder-pasted pads. However, they are slower to start and stop, less precise in their vibration patterns, and can sometimes feel "buzzier" rather than offering sharp, distinct feedback. A misaligned tray compromises the phone's ingress protection, making it more susceptible to dust and water damage, especially if the device is rated water-resistant. Remove Logic Board: Once all screws and flex cables are disconnected, gently lift the logic board out of the frame. Failures during this phase can range from minor glitches to complete bricking of the device, preventing users from accessing their new phone. Isopropyl Alcohol (IPA) (>90%) and cotton swabs (for cleaning, if needed) Go to Settings > System > System update to check for pending Android OS updates. Crucial Tip: Perform this step as quickly as possible and minimize air movement to prevent new dust from settling. Then, check continuity from the corresponding pad on the logic board to the first component in the RF signal path (e.g., a filter or switch). A camera flex cable is a thin, flexible printed circuit board (FPCB) that carries multiple traces (electrical pathways).

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