[SOLVED] I'm looking for F R570 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my F R570. 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.

@Lars

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 F R570 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/557579/Replaced+battery+-+icon+shows+black+now
Take a look at comment #1169
Also, this : https://www.ifixit.com/Answers/View/907623/Controller+has+two+white+lights+under+touch+pad+wont+connect.
You can also check this video starting from minute 1:

The F R570 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 F R570 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 F R570 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 F R570 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/Answers/View/297342/Where+can+I+buy+a+S7+edge+backplate

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

Unscrew the bracket, then use a plastic spudger to gently pry up and disconnect the battery flex cable. Dynamic Wallpapers/Screensavers: Avoid static wallpapers for long periods. Inspect for Damage: Carefully inspect the card reader slot for bent, broken, or corroded pins. Replacing an integrated SMD microphone is a testament to advanced micro-soldering capabilities. Patience and attention to detail are paramount to a successful outcome. The most common causes for a damaged audio jack are physical trauma (e.g., dropping the phone while headphones are plugged in, forcing an incompatible plug), liquid damage (causing corrosion), or simply wear and tear over time from repeated plugging and unplugging. The Bluetooth functionality is part of a BGA (Ball Grid Array) chip, often combined with Wi-Fi, that is soldered directly onto the main logic board. By being diligent in repair processes and using reliable diagnostic tools, smartphone owners can ensure their device's audio output remains clear, balanced, and free from the subtle yet detrimental effects of reversed speaker polarity, thereby preserving the intended audio experience for music, calls, and media consumption.Coil whine, often described as a high-pitched buzzing, whistling, or screeching sound, is an audible phenomenon that can sometimes plague electronic devices, including smartphones. If your device has an unlocked bootloader and you've installed a custom recovery like TWRP (Team Win Recovery Project), you have more granular control. A significantly older security patch level (e.g., several months or years older than current) confirms a successful or partial rollback to older firmware. If the screen itself has an internal defect (e.g., one of the backlight layers is misaligned from the factory), or if it's an aftermarket screen with slightly different tolerances or mounting points than the original. Quick Tinning of Pad: Bring the pre-tinned iron tip to the pad, and almost simultaneously, touch a tiny amount of fresh solder wire to the pad. Enable USB Debugging/OEM Unlocking: On your phone, go to `Settings > About Phone` and tap "Build number" multiple times to enable Developer Options. Action: Go to Settings > About phone, and tap "Build number" 7 times to enable Developer Options. However, achieving uniform heat across a larger BGA, especially on a multi-layered smartphone PCB, is challenging and highly dependent on technician skill. Damaged Wireless Charging Flex Cable: The flex cable connecting the receiver coil to the logic board can be torn, corroded, or disconnected. Inspecting for Damage: Removing a flex cable allows you to visually inspect the pins on both the cable and the receptacle for corrosion, bent pins, or other damage. Physical Stress/Pressure: Applying pressure to certain parts of the screen or frame might induce flickering if there's an underlying hairline crack, a loose component, or internal damage to the OLED layer. Physical Damage: Drops or impacts can damage the delicate infrared emitter/receiver, especially if the impact point is near the top of the phone where the sensor is usually located. The ambient light sensor (ALS) is a small but sophisticated component in smartphones that plays a crucial role in enhancing user experience and battery life. This repair is undeniably challenging, demanding extreme attention to detail and a methodical approach. Final Sealing: If all tests are successful, proceed to seal the device (e.g., re-adhere the screen or back cover), ensuring proper adhesive application for dust and water resistance. Excessive bubbling suggests poor application technique or a low-quality tape. Before fully sealing the phone, perform a preliminary test (see below). While a malfunctioning loudspeaker can dampen your smartphone experience, replacing it is often a manageable DIY repair that can restore crystal-clear audio, allowing you to fully enjoy your device's multimedia capabilities and essential functions. Observe Solder: Keep a close eye on the solder joints through the microscope. Apply Flux to Board: Apply a thin, even layer of fresh liquid or gel flux to the clean pads on the logic board where the new SIM reader will sit. Set your hot air station to the appropriate temperature (typically 280-350°C, depending on the solder type and component size) and a low, controlled airflow. The entire assembly is suspended by incredibly fine springs or gimbals, allowing for precise, minute adjustments. Always consult model-specific guides, prioritize safety precautions, and work with patience and precision to ensure a successful repair.5.

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