[SOLVED] I'm looking for CELPHY F9 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my CELPHY F9. 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.

@Maureen

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 CELPHY F9 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/need-help-in-porting-halium-project-to-sgs4-jfltexx.3745216/
Take a look at comment #202
Also, this : https://xdaforums.com/t/wallpaper-request.746262/.
You can also check this video starting from minute 4:

The CELPHY F9 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 CELPHY F9 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 CELPHY F9 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 CELPHY F9 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/sense-rom.3300069/

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

Diagnostic Tools: Some manufacturers or third-party apps offer diagnostic tools that can test camera and microphone functionality. Always proceed with caution and manage expectations regarding the level of water resistance achieved.## 10. Many display issues are due to a faulty display panel itself, not the connector or motherboard. Avoid touching the active display area with bare hands, as it will likely be warm and susceptible to fingerprints. The initial press of the power button typically causes a small spike in current, perhaps 20-50mA, as the PMIC receives the power-on signal and begins to enable primary power rails. If it's mismatched, the phone might display a warning or limit certain functionalities. Take your time to avoid stretching or deforming the adhesive strip, as this can create gaps or weak points in the seal. Adhesive Strips: If your phone's back cover or screen relies on adhesive for reassembly and water resistance. You will find several files, including `flash-all.bat` (Windows) or `flash-all.sh` (macOS/Linux), and various `.img` files. You can then restore your backed-up data during the setup process or later. Restart Phone: A simple restart can often resolve temporary software bugs affecting the camera. A higher negative dBm value (e.g., -100 dBm) indicates weaker signal, while a lower negative value (e.g., -70 dBm) indicates stronger signal. They offer the deepest level of hardware diagnostics, system-level calibration, and access to protected diagnostic modes. Water Damage: Look for signs of corrosion near sensor components, which can disrupt their electrical connections. Fine-Tipped Soldering Iron: For touch-ups, cleaning pads, or working with through-hole components. Next, you will need to open the phone, which usually involves removing screws from the bottom (often Pentalobe or Torx) and then carefully prying open the display assembly from the frame. If not, power off, disconnect the battery, and re-check all connections, especially the Qi coil flex cable. Specific Component Failure: If the inductor supplies power to a particular IC (e.g., Wi-Fi module, audio codec), that component will not function. Even if your phone appears dead, a deeply entrenched software issue could be preventing it from booting. Proper Reassembly: Ensure all cables are routed correctly, no components are pinched, and all shields and screws are reinstalled properly during reassembly. The most obvious sign is a significant increase in application loading times; apps that once launched instantly now take several seconds or more. Clean the Area: Use IPA and a cotton swab to clean any dirt, dust, or old flux residue from around the component. Disconnect Battery: ALWAYS disconnect the battery as soon as possible to prevent short circuits while working on the internals. Copy Files: Open "This PC" (Windows) or Finder (Mac), locate your phone, and browse to the "DCIM" (for photos/videos), "Pictures," "Downloads," and "Music" folders. Only move to hardware inspection and potential component replacement if software remedies fail. Sometimes, a slightly larger Phillips bit might grip a slightly stripped Phillips screw better if the outer edges are still intact. Removing Back Glass Panels: Many Android flagships (e.g., Samsung Galaxy, Google Pixel) open from the back. Intermittent smartphone failures are arguably the most frustrating issues a user or technician can encounter. Organize Screws: Use a magnetic mat or a compartmentalized tray to keep track of all screws, noting their sizes and original locations. An old, degraded battery might seem to drain quickly, but it's not a true leakage current issue.

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