[SOLVED] I'm looking for Asus X003 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Asus X003. 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.

@Seb

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 X003 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/Wiki/Lenovo_Thinkpad_E14_Gen_4_Keeps_Crashing
Take a look at comment #1619
Also, this : https://www.ifixit.com/Guide/Toshiba+Satellite+S75D-A7346+RAM+Replacement/75496.
You can also check this video starting from minute 2:

The Asus X003 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 X003 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 X003 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 X003 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-desire-hd-ics-status-what-works-or-doesnt.1825313/

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

Conflicts often arise if the intended data SIM isn't selected or if the phone automatically switches unexpectedly. Applying a thick, insulating coating can impede heat transfer, leading to overheating. In some cases, a small module attached to the screen's flex cable might be replaceable, but this is less common and usually involves specific alignment tools. This is often achieved through ESD protection diodes (TVS diodes) connected between signal lines and ground. Proximity Sensor: Screen does not turn off when holding the phone to your ear during a call, leading to accidental touches, muting, or hanging up. Key Applications: Briefly open a few commonly used apps (e.g., browser, social media) to ensure general software stability. Set the multimeter to the appropriate Ohm range (start high and go lower if needed). Flex Cable Locations: Where are the display, digitizer, home button, and other sensor flex cables located? Knowing this will tell you exactly where NOT to pry deeply. Ambient Light Sensor: In a well-lit room, ensure auto-brightness is on, then dim the lights or cover the sensor. Let the adhesive become slightly tacky, then use tweezers to precisely place the new foam filter. This helps the phone's battery management system (BMS) accurately gauge the new battery's capacity. Its primary function is to eliminate microscopic air gaps between these two surfaces. This is usually done through specific diagnostic menus or by factory resetting the phone. Reduced Electronic Waste: Less e-waste is generated as fewer functional components are discarded unnecessarily. Hydrophobic Coatings: Repel water, aiding in water resistance and preventing water droplets from sticking and distorting images. Review them for any blurriness, dark spots, or unusual artifacts that might suggest an obstruction. Use tweezers to place the new grille precisely, then apply gentle pressure until the adhesive sets. In conclusion, the ability to identify original smartphone parts marked with unique serial numbers is a critical skill in today's repair landscape. Component Integrity: Some pressure sensor ICs are located directly on the display flex cable. Ventilation: If using soldering fumes, flux, or cleaning agents, work in a well-ventilated area to avoid inhaling harmful fumes. Press the button: While holding the probes, press the external power button (or gently press the internal tactile switch). Often, this includes new buttons, antenna lines, and sometimes pre-installed small components like speaker meshes. If all external factors and software troubleshooting have failed, the problem likely lies within your smartphone's hardware. Address Obvious Shorts: Use a multimeter to check for any major short circuits (power to ground). Restart the Device: A simple reboot can often resolve temporary software glitches. It’s an irreversible process for the data on the device itself, hence the critical importance of proper preparation. Be incredibly careful not to scratch, puncture, or damage them while working on the screw. Rapid Battery Drain: Even when idle, the phone loses charge quickly due to improper power regulation. However, for efficient and consistent charging, precise alignment between these coils is critical. Disconnect the Battery: Once the phone is open, locate the battery connector on the motherboard.

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