[SOLVED] I'm looking for Asus Zenfone 3 Laser repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Asus Zenfone 3 Laser. 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.

@Mona

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 3 Laser 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/mod-volume-shutter-for-camera-by-freeza.1844740/
Take a look at comment #542
Also, this : https://www.ifixit.com/Answers/View/812893/Phone+not+turning+on+after+being+dropped+and+cracking+the+screen.
You can also check this video starting from minute 9:

The Asus Zenfone 3 Laser 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 3 Laser 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 3 Laser 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 3 Laser 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://xdaforums.com/t/q-how-to-create-new-thread-in-paid-software-forum-for-newbie.2909487/

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

Before you begin this intricate repair, several crucial preparatory steps and safety measures must be taken. Look for periods where the phone should be idle but is still consuming significant power. Start by aligning the top edge (earpiece, front camera, sensors) or the bottom edge (home button if present) first. SD cards have a limited lifespan and can degrade, especially cheap or counterfeit ones. Research Your Phone Model: Find a detailed repair guide or teardown video specific to your smartphone model (e.g., on iFixit, YouTube). Integrated Circuit (IC) / Chip (U): A rectangle, often with pin numbers and function labels. Observe the current reading on the multimeter when the phone is completely off. Uninterrupted Full Charge: Plug in the original charger (or a known-good, high-quality charger) and charge the phone to 100% in a single, uninterrupted session. If the new display works, the original display assembly is faulty and needs replacement. iPhone (Pentalobe Screws): Remove the two pentalobe screws at the bottom edge. After the smartphone is fully reassembled, apply gentle, even pressure around the edges of the screen for several hours to allow the new adhesive to properly bond and cure. By systematically diagnosing the problem and working through the solutions from least to most intrusive, you stand a good chance of rescuing your smartphone from its endless restart cycle. The success of the new gasket depends entirely on the cleanliness of the surfaces. Test in Different Locations: Move to an open area away from known sources of strong magnetic fields (see point 3). If a specific rail is missing or incorrect, it pinpoints the issue more precisely. The joint will now be primarily with the pre-tinned, gold-free surface. This often resolves temporary glitches in the router's firmware or network congestion. Wireless charging has become an indispensable feature for many smartphone users, offering convenience and reducing wear on physical charging ports. One of the most insidious forms of damage is the "micro-crack", a hairline fracture in a solder joint, a PCB trace, or even a component package that is often invisible to the naked eye or even under standard optical microscopes. This prevents accidental shorts or damage to components if the screen or internal flex cables are inadvertently touched. Experience: The more boards you examine and repair, the better you become at recognizing common ICs and passive component layouts. This allows you to confirm if your latest action resolved the problem before fully reassembling the device. This guide will clarify the different types of latch mechanisms, detail how to diagnose the specific point of failure, and provide a range of repair options from basic re-adhesion to more advanced structural restoration techniques, ensuring your phone's screen remains firmly and safely in place. NAND Programmer: A model-specific (e.g., JC P13, WL) or universal (e.g., EasyJTAG, UFI) NAND programmer with appropriate adapters for the chip's package. While challenging, successfully repairing a damaged multi-pin connector can save an otherwise defunct smartphone, highlighting the power of component-level repair.An unresponsive software navigation bar on a smartphone, where the on-screen back, home, and recent apps buttons fail to react to touch, is a common and often frustrating issue. While smartphones are designed with some level of protection against minor voltage variations, a significant power surge can overwhelm these safeguards, leading to irreversible damage to internal components. You must download the correct stock firmware for your phone's exact model number (e.g., SM-G998U, A205FN, etc.) and region/carrier. A healthy phone in standby should typically draw between 5mA and 20mA. Most ICs have an orientation mark (a dot, a line, or a chamfered corner) that must match the corresponding mark on the PCB. Cleanliness: A clean board and flux-free tools are essential for good solder joints.

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