[SOLVED] I'm looking for SMILE Y1 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my SMILE Y1. 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.

@Lupita

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 SMILE Y1 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/756246/Strange+behavior+after+door+switch+replacement
Take a look at comment #226
Also, this : https://xdaforums.com/t/faster-4g-after-update.712922/.
You can also check this video starting from minute 5:

The SMILE Y1 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 SMILE Y1 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 SMILE Y1 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 SMILE Y1 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-need-help-switching-from-amon-recovery-to-clockwork-recovery.753027/

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

A precise diagnosis is key to efficiently resolving the problem and restoring full functionality. Without this knowledge, many complex "dead phone" or functional issues remain unsolvable. Conformal coating is a thin, polymeric film that "conforms" to the contours of a circuit board and its components. While not directly a "grounding issue," it's a common finding during ground checks. The process will involve opening your phone, which typically means removing the back cover or, less commonly, the screen. Proper Orientation: Ensure the SIM card is correctly oriented in the tray before insertion. Post-repair placement: After a repair, technicians might use generic tape. Optical Image Stabilization (OIS) Failure: If photos are consistently shaky, and the OIS mechanism is audible or visibly malfunctioning, the module may need replacement. For most users, seeking professional help from a reputable repair shop is often the safest and most reliable option.3. Once the super glue has been softened chemically, mechanical removal becomes safer and more effective. Torn traces: The microscopic copper pathways (traces) leading to the pads can be torn or scratched, effectively breaking the circuit. Re-register your fingerprints, ensuring you follow the on-screen prompts precisely, moving your finger slightly with each scan to capture a comprehensive image. Failed Software Update: Interruption during an official over-the-air (OTA) update, low battery during update, or corrupted update files. Is it bent, cracked, or missing pieces? Is the SIM card sitting correctly in the tray? Always power off your phone completely and disconnect the battery as the very first step once the device is open. Repair Documentation: Availability of official service manuals or schematics. For CSC, you usually have two options: "CSC" (which performs a factory reset) and "HOME_CSC" (which tries to retain user data, but usually fails to fix boot loops). Component Damage: Components under the shields or on the inner surfaces of the boards are highly susceptible to damage from heat or physical force. Ensure no other flex cables were accidentally disconnected or damaged. Improper repair, such as using a non-OEM back cover that lacks the integrated LDS antenna or not correctly reseating an FPC antenna, can also lead to significant performance drops. A smartphone "stuck in headphone mode" is a peculiar and highly disruptive issue where the device behaves as if headphones are constantly plugged into its audio jack, even when they are not. The impact of micro-cracks ranges from intermittent issues (e.g., phone randomly reboots, Wi-Fi drops out, certain functions fail sometimes) to complete device failure if a critical power or data line is severed. Speakers/Earpiece: Check that the loudspeaker module and earpiece speaker are seated correctly in their gaskets/housings. By understanding these distinctions, you can ensure that your smartphone repair results in a device that performs as close to its original glory as possible.## 3. Removing a smartphone battery that is stubbornly glued in place is one of the most common yet potentially dangerous tasks in smartphone repair. In the intricate world of smartphone repair, where components shrink to microscopic levels and voltage tolerances dwindle, one invisible adversary poses a constant threat: Electrostatic Discharge (ESD). Go to `Settings` -> `System` -> `Reset options` -> `Erase all data (factory reset)`. Factory Reset (Last Resort for Software): If all other software troubleshooting fails, a factory reset is often the most effective solution for deep-seated software issues. Ensure it's fully seated and the retaining clip (if any) is securely closed. Reassemble & Test: Reinstall the motherboard, reassemble the phone, and test charging, temperature monitoring, and overall stability.

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