[SOLVED] I'm looking for Asus ZenFone 2 Global repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Asus ZenFone 2 Global. 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.

@Jonas

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 Asus ZenFone 2 Global 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/is-there-any-way-to-enable-dynamic-refresh-rate-on-miui-hyperos.4654957/
Take a look at comment #125
Also, this : https://xdaforums.com/t/q-integrating-updates-into-the-system-rom.2727027/.
You can also check this video starting from minute 7:

The Asus ZenFone 2 Global 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 Asus ZenFone 2 Global 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 Asus ZenFone 2 Global 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 Asus ZenFone 2 Global 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/iPhone+12+Rear-Facing+Cameras+Replacement/140583

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

Latex gloves may not offer adequate protection for prolonged exposure. Screwdriver Set and Opening Tools (If internal inspection is planned): For safe disassembly. Rear Microphone: Can be on its own small flex, or part of the rear camera assembly. In conclusion, the safe and effective handling and storage of new smartphone batteries are paramount for safety, performance, and longevity. Once the fault is cleared and they cool down, their resistance drops, and they "reset." However, repeated trips can degrade them. Hide Navigation Bar/Status Bar: Some devices or launchers allow you to auto-hide the navigation bar or status bar to reduce static elements. Test touch functionality across the entire screen (drag an app icon around). In many modern smartphones, the "back cover frame" refers to the entire rear chassis assembly, which includes: Look for "Noise Reduction" or "Phone Noise Cancellation" settings in your phone's call settings and try disabling them. Plastic Spudger (Nylon or similar non-conductive material): This is your primary tool for disconnecting press-fit connectors. Proactive internal cleaning can significantly mitigate these risks, but it's a delicate operation requiring precision, the right tools, and an understanding of the risks involved. Use the appropriate screwdriver to remove the tiny screws securing these shields. Watch multiple high-quality teardown videos specific to your exact phone model (including the specific revision if applicable). This process requires specialized tools, a high level of skill, and an understanding of board-level electronics. Backup Data: Absolutely crucial, as full disassembly always carries a risk. If the touchscreen issue persists after a factory reset, it strongly indicates a hardware problem. Metal Spudger/Utility Knife/Razor Blade: For more stubborn residue (use with extreme caution to avoid scratching the frame or yourself). Leave enough slack for the component to sit properly, but not too much that it creates a loop. Objective testing provides quantifiable data, although it often requires specialized tools and expertise. Performance: If the phone frequently slows down, stutters, or shuts down unexpectedly, especially when the battery percentage is still high, a new battery will likely restore performance. A faulty PMIC can lead to incorrect power delivery, causing components to draw too much power or the battery to misreport its charge level. Download storage benchmarking apps (e.g., AndroBench, A1 SD Bench for Android). An unresponsive area on a touchscreen can be a perplexing problem, but by following a logical diagnostic path from software to hardware, starting with the simplest solutions and progressing to component replacement, you can effectively pinpoint and resolve the issue. No Charging: The phone doesn't detect the charger at all, even with known good cables and chargers. B-7000 or similar adhesive / Pre-cut adhesive strips (optional): For resealing the phone to maintain dust and water resistance. This is typically reserved for professional repair shops due to its complexity and risk. Disconnect the Battery: Once the screen assembly is partially lifted, you will likely see a metal shield or tape covering the battery connector on the logic board. Work Slowly and Methodically: Rushing can lead to irreversible damage. Use a preheater under the motherboard, if available, to bring the board up to a baseline temperature, reducing thermal stress and preventing warping. Damage to even a single critical via can disrupt entire circuits, leading to component failure, signal loss, shorts, or complete device malfunction.

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