[SOLVED] I'm looking for Blackview BV5500 Pro repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Blackview BV5500 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.

@Lila

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 BV5500 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://www.ifixit.com/Guide/LG+G+Pad+8.3+Motherboard+Replacement/50831
Take a look at comment #777
Also, this : https://xdaforums.com/t/galaxy-note-hardbrick-by-flashing-kingdorid-rom-possible-emmc-bug-help-needed.1715796/.
You can also check this video starting from minute 6:

The Blackview BV5500 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 BV5500 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 BV5500 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 BV5500 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://xdaforums.com/t/cyanogenmod-13-nightly-4g-lte-doesnt-work-thor.3472987/

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

Carefully locate these connectors, which are often covered by metal shields secured by tiny screws. Examine for Liquid Damage or Physical Impact: Carefully inspect the backlight circuit area for any signs of liquid ingress (corrosion, discoloration) or physical damage (dents, cracked components). Tearing them is easy and often requires replacing the entire component. Its primary function is to detect the intensity of surrounding light and automatically adjust the screen's brightness accordingly. If the button feels normal but the phone doesn't respond, it's time to consider internal hardware issues. Verify Against Known Direction: After calibration, check the compass against a known true direction (e.g., using a physical magnetic compass, or by comparing it to a reliable map with a GPS lock, ensuring the map is oriented to true north). Adjustable Chair: A comfortable, ergonomic chair is vital for long repair sessions. This could include issues with the FPC connector on the board itself, power management ICs supplying power to the display, or even a damaged GPU/AP affecting video output signals. Connector Issues: The digitizer flex cable might be loose, dirty, or damaged where it connects to the logic board. Symptoms of a faulty NFC antenna module include the inability to activate NFC in the phone’s settings (the toggle might be grayed out or disappear), error messages when attempting contactless payments, failure to pair with NFC-enabled devices, or an inability to read NFC tags. However, be acutely aware of "pairing" or "serialization" issues, particularly with Apple devices, as these can prevent full functionality even with a perfectly installed replacement part. This is a more aggressive way to clear system-level cached data that might be corrupted. Samsung (Odin): If a Samsung phone can enter Download Mode, you might flash a stock firmware to fix boot loops or soft bricks. Cable Quality: A damaged, frayed, or cheap, non-certified charging cable can have higher resistance, leading to more heat generation and slower charging. Water Resistance: If the phone was water-resistant, ensure you use new, appropriate adhesive for re-sealing the device to restore some level of water protection. Observation: If the original SIM is NOT detected in another phone, the SIM itself is faulty. However, by following these detailed steps, employing the right tools, and exercising patience, you can successfully improve your phone's thermal performance, leading to a cooler, faster, and more reliable device. Prying them out incorrectly can puncture the battery, leading to dangerous thermal runaway, fire, or even explosion. Sharp Tools: Be cautious with drill bits, Dremel tools, and any sharp prying tools. It's a challenging but highly rewarding repair that can restore essential functionality to a smartphone, saving the cost and potential compatibility issues of a full flex replacement. If on the Back Glass: If the magnets are integrated directly into the back glass (common in many designs), you will need to carefully pry them off. Sometimes, a simple reboot can clear temporary errors and allow the phone to remount the SD card correctly. Factory Reset: As a last resort for software issues, a factory reset (after backing up data) will return the phone to a clean state, eliminating any software-related conflicts. Power off, disconnect battery, and carefully re-examine the sensor's alignment with its window on the display/frame. Reassemble Components: Reinstall all mid-frames, shields, and other components, ensuring all screws are in their correct places. If the symptoms disappear (e.g., the screen no longer turns off randomly), the case itself might be faulty (e.g., a magnet has come loose, or it's an incompatible case generating spurious fields). Other Cards: Ensure you don't have multiple NFC cards (e.g., transit cards, credit cards) in a wallet case, as they can sometimes create interference. Cracks/Shattering: Drops or impacts can crack or shatter the protector, leading to severe image degradation and exposing the actual camera lens to damage. Batteries should be stored in a cool, dry place, away from direct sunlight, heat sources, and extreme cold. Use Diagnostic Mode: Access your phone's hidden diagnostic menu (research the specific code for your model).

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