[SOLVED] I'm looking for Oppo A57s V2 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Oppo A57s V2. 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.

@Oum

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 Oppo A57s V2 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/578767/blue+ray+disc+player+come+on+when+tv+is+on.
Take a look at comment #275
Also, this : https://xdaforums.com/t/q-i-need-the-default-ringtone.1590845/.
You can also check this video starting from minute 2:

The Oppo A57s V2 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 Oppo A57s V2 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 Oppo A57s V2 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 Oppo A57s V2 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/about-google-now-launcher-always-on.3195756/

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

If a customer refuses their passcode, explain the limitations of testing and proceed with hardware diagnostics that do not require access to the operating system.## 7. As the solder balls melt, the IC will usually "snap" or "self-align" slightly due to surface tension, indicating a successful reflow. Uninstall Unused Apps: Remove any applications you don't actively use. With the motherboard roughly in place, visually confirm that all screw holes align with their corresponding posts in the chassis. Sufficient Storage Space: Ensure you have enough space in your cloud account or on your local computer/external drive for the backup. Guide to Replacing the Light Source/LED Array in a Smartphone Backlight Unit After replacing the flex cable, reassemble the phone and test thoroughly. For owners of these phones, a malfunctioning headphone jack can be a major inconvenience, rendering wired headphones useless. Diagnosing and fixing it requires a methodical approach, starting with the simplest solutions and progressing to more involved hardware repairs. If a rail is missing, unstable, or out of specification, it points to a problem with the PMIC itself, the specific buck/boost/LDO regulator responsible for that rail, or a short circuit on the rail's output that is preventing it from coming up. Weather Forecasting: Contributing to local weather predictions by detecting changes in atmospheric pressure. Faulty Replacement Part: It's possible the new wireless charging pad itself is faulty. Pad Cleaning: Clean the solder pads on the motherboard using a soldering iron and solder wick, then clean thoroughly with isopropyl alcohol. For most users, if the display assembly replacement does not resolve a touchscreen issue, seeking professional micro-soldering services or considering device replacement are the most practical options.8. No Prompt: When connecting the phone to a computer, the expected "Use USB for..." notification or pop-up does not appear in the notification shade. (Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings on iOS; Settings > System > Reset options > Reset Wi-Fi, mobile & Bluetooth on Android). Locked Phone: If your phone is locked to a different carrier, a SIM card from another provider will not provision. The digitizer flex circuit is a critical component responsible for transmitting touch input from the smartphone screen to the device's logic board. Safety Hazards: Overheating, battery fires, electrical shorts, chemical leakage, particularly with fake batteries. However, a successful replacement restores the structural integrity of your smartphone, ensuring its durability and proper fitment of components, which can prolong its lifespan significantly. Search for your exact device model and the error message you're seeing. Learning Curve: Requires significant practice to control temperature, airflow, and nozzle placement effectively. Does the phone vibrate at all? Is the vibration consistent or is there a noticeable rattling? Technicians must exercise extreme caution, utilize preheating plates, and apply precise temperature profiles with their rework stations. Locate the Fingerprint Sensor Flex Cable: The flex cable typically runs from the side of the phone, under the logic board, or along the frame, connecting to a ZIF (Zero Insertion Force) or snap-on connector on the main board. Position Chip: Carefully align the reballed BGA chip onto its pads on the logic board. Check its settings to ensure it's set as the default payment app if you have multiple. Toggle Bluetooth On/Off: Turn Bluetooth off, wait a few seconds, then turn it back on. This is the most significant hurdle for baseband IC replacement, particularly with iPhones: Chimera Tool: Highly versatile, supports many brands (Samsung, Huawei, LG, BlackBerry, HTC, etc.).

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