[SOLVED] I'm looking for Allview P7 Pro repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Allview P7 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.

@Axel

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 Allview P7 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/charging-screen-functionality-disappeared.3702901/
Take a look at comment #1338
Also, this : https://xdaforums.com/t/q-about-note-5-n920f-or-n920t.3310411/.
You can also check this video starting from minute 2:

The Allview P7 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 Allview P7 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 Allview P7 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 Allview P7 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/mod-aosp-status-bar-for-aosp-toggles-jb-layout-volume-sliders-colour-changer.2609321/

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

While not directly part of IMEI programming, a proper repair might involve restoring other NVRAM components. The internal plastic display spacer, sometimes referred to as a midframe spacer or screen frame, is a less talked-about but vital component within many smartphones. They can help you identify if you're truly connecting to a 5G tower and the quality of that connection. When this decryption process fails, the phone becomes essentially an unusable brick until the issue is resolved. The proximity sensor prevents accidental touches and saves battery by turning off the screen when you're on a call and hold the phone to your ear. Similar to thermal paste, thermal pads can degrade over time or require replacement during repair: Once the display is safely open, immediately locate and disconnect the battery connector. Antenna Problems: Check if the internal antenna flex cable is loose, damaged, or disconnected. Gaining full access to the hinge often requires removing nearly all internal components from both halves of the device, including the logic boards. Clean the Area Thoroughly: This is the most critical step for pristine photos. Fortunately, replacing a defective loudspeaker is a relatively common and often straightforward DIY repair for those with some experience in smartphone disassembly. This often points to a software calibration issue or a bug in the BMS reporting. Irreversible Damage: One mistake (overheating, misaligning, lifting pads) can permanently destroy the irreplaceable original IC or damage the new flex. Preliminary Test: Before full reassembly, it's highly recommended to connect the battery and screen (if easily attachable) and perform a quick test to ensure the new microphone is working. You'll then need to uninstall recently installed apps one by one to identify the culprit. Logcat displays real-time system messages, including crash reports, errors, and warnings. The goal here is to remove the bulk without damaging the frame or the hinge. Carefully reconnect the flex cables of the new display assembly to the motherboard. Use a lens cleaning cloth or micro-fiber cloth to gently wipe the lens. If there's a short, the current draw will immediately spike to the set limit. This often causes the backlight driver IC to shut down or burn out components. Motherboard Replacement: If the Wi-Fi module is integrated into the SoC and confirmed faulty, or if the damage to the motherboard is too extensive (e.g., lifted pads under the SoC, severe liquid damage), motherboard replacement is typically the only viable solution. This is often the most common repair for true hardware-related discoloration. (Often, this comes integrated with the earpiece speaker or front camera flex cable). This array usually comprises several key components that enable essential functionalities: the proximity sensor, which turns off the screen when you hold the phone to your ear during a call; the ambient light sensor, which automatically adjusts screen brightness based on environmental light; and sometimes additional elements like an IR blaster or flood illuminator for facial recognition systems (e.g., Apple's Face ID). SIM Card Issues: A faulty or improperly seated SIM card can cause signal problems. Pogo-pin connectors, often overlooked yet crucial components in modern smartphones and their accessories, serve as vital interfaces for power, data, and sometimes audio signals. Modern smartphones, especially high-performance models, come equipped with quick-charge capabilities, allowing them to replenish their batteries rapidly. The causes for a phone getting stuck in headphone mode primarily fall into two categories: software glitches or physical issues with the headphone jack. The modem in a smartphone is a critical component responsible for all wireless communication, including cellular data (2G, 3G, 4G, 5G), calls, SMS, and sometimes Wi-Fi and Bluetooth.

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