[SOLVED] I'm looking for Blackview BV9500 Pro repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Blackview BV9500 Pro. 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.

@Jesse

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 Blackview BV9500 Pro 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/q-format-32gb-with-ext4.1188933/
Take a look at comment #385
Also, this : https://www.ifixit.com/Answers/View/233905/Where+is+drain+plug+located+on+transmission.
You can also check this video starting from minute 10:

The Blackview BV9500 Pro 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 Blackview BV9500 Pro 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 Blackview BV9500 Pro 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 Blackview BV9500 Pro 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/Guide/Motorola+Moto+Z2+Play+Screen+Replacement/103234

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

Replacement BMS flex cable (or a new battery cell if transferring the old BMS). The flux helps the solder flow only to the tinned pads, avoiding bridges. This poses a significant danger to waste collection workers, recycling facilities, and landfills, where such incidents are becoming increasingly common. Power on the device and immediately test the camera functionality extensively. Heat Gun or Hair Dryer: To soften adhesive holding the screen or back cover, and for any adhesive-backed shielding. Even a tiny speck of dust on the camera lens will show up in your photos. All these components are integrated onto a single silicon die, making the SoC a marvel of miniaturization. In many modern phones, the headphone jack is a modular component, often integrated into a flex cable assembly (sometimes combined with the charging port or other sensors). Consistent Offset: The defining characteristic is that the error is not random. When heat and pressure are applied, the particles form electrical connections between the traces on the flex and the corresponding pads on the glass, while the resin cures to provide insulation in other areas. Symptoms: Note the specific component that is non-functional (e.g., charging port not working, camera not detected). Sometimes, a gentle press on the board in the area of these contacts can confirm they are properly engaged. Using Incorrect Screw Lengths: Inserting a screw that is too long into a shallow post can push through the bottom, damaging the post and potentially components underneath (e.g., the motherboard). Good Lighting: A bright, directional light source (e.g., desk lamp) to illuminate the internal components. The goal is to gradually separate the entire surface area of the adhesive. If you are not experienced with micro-soldering, it is strongly recommended to seek professional assistance from a qualified technician to avoid permanent damage to your device. Does it click correctly? Does it activate the voice assistant consistently? Is there any "ghost" activation? If the button functions as expected, then proceed with the full reassembly, carefully reattaching all screws, shields, and finally the back cover or display. If a pad has lifted but the trace beneath it is still intact, you may attempt to carefully re-adhere it. There is no publicly available "reprogramming" tool for this outside of Apple's authorized service channel. Immerse the board (without the battery or any cameras/flex cables that can be removed) in the solution and run the cleaner for short cycles, typically 5-10 minutes. Remove Screws and Brackets: The audio jack board (or the larger flex assembly it's part of) is usually secured by several small screws and possibly a metal bracket. Overheating during Charging: The phone or a specific area around the charging IC gets excessively hot during charging. Update Software: Ensure the operating system and all apps are up to date. If enabled, ensure it's not the cause of perceived slowness during the day. For minor dents, very carefully use fine files (jewelers files) to reshape the metal, working slowly to avoid removing too much material. Tools: Precision screwdrivers, spudgers, prying tools, heat gun (to soften adhesive), suction cup, tweezers. Install All Internal Components into the New Frame: Now, reverse the process, carefully placing each component into its new home. A bug or defect in the controller's firmware or hardware can cause the entire chip to fail, regardless of the NAND cells' health. The Process of Rebuilding a Damaged Corner of a Smartphone Logic Board Voice Assistant: Try using your voice assistant (Siri, Google Assistant).

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