[SOLVED] I'm looking for LANDVO V1 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my LANDVO V1. 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.

@Marcos

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 LANDVO V1 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/shared-rom-pixel-experience-aosp12l-star.4439379/
Take a look at comment #198
Also, this : https://www.ifixit.com/Answers/View/750764/Game+won't+load.
You can also check this video starting from minute 3:

The LANDVO V1 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 LANDVO V1 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 LANDVO V1 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 LANDVO V1 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/smashed-screen-backup-question.3520438/

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

The failure of a fuse or diode, while a problem in itself, often indicates a deeper issue , the protection circuit did its job, but something triggered it. In more severe cases, the camera app might crash, display an "camera error" message, or even refuse to open altogether, though this could also point to other camera module issues. Initial Test: Before completely resealing the phone, perform a quick test. Clean the Sensor: Physical debris, oil, moisture, or smudges can severely impair sensor performance. While manufacturers try to mitigate this with potting compounds or specific designs, it's not always entirely eliminated, and some components are simply more prone to it than others. Once disconnected, the screen assembly can often be fully removed and set aside. As a last resort on the software side, consider a factory reset, but be warned: this will erase all data on your phone, so a comprehensive backup is absolutely essential. A multimeter can be used to check continuity and resistance to ground, confirming if a pad is open (no connection) or shorted. Disconnect: Carefully use a plastic spudger to pry up the battery flex connector from its socket on the motherboard. Smartphone manufacturers typically ship devices with a "locked bootloader" as a security measure, preventing unauthorized software modifications. The causes behind audio IC failures are diverse, but certain scenarios are particularly prevalent. The quality depends on the donor phone's condition, and they may show signs of wear. A healthy inductor should show a very low resistance (near 0 Ohms) and beep, indicating continuity (it's essentially a wire coil). The diagnostic process typically begins by distinguishing between software and hardware problems. Using a flashing tool: Depending on your phone's brand, you'll use a specific tool (e.g., Samsung Odin, LG Flash Tool, Xiaomi MiFlash, or generic Fastboot commands). Physical Damage: Even without visible cracks, a drop or impact can damage the internal layers of the LCD or OLED panel, leading to color inconsistencies. Replacing this sensor is a moderately difficult repair, typically requiring access to the phone's front assembly. Before attempting any sensor adjustment, gather your tools and prepare the device: As storage fills up, the operating system has less contiguous space to write new files, leading to fragmentation and slower access times. Boot into Safe Mode: If the issue persists, boot your phone into safe mode (check your phone's model for specific instructions). This makes removal significantly more difficult, requiring higher temperatures and careful prying, increasing the risk of damaging the PCB. (This probe configuration is common practice for boardview software and provides consistent readings). Check for Physical Damage: Inspect the screen for cracks, deep scratches, or areas where the screen appears to be lifting. With a multimeter, measure the voltage directly at the battery's terminals (or on the battery connector on the logic board side while battery is connected). After performing any necessary repairs or cleaning, carefully reassemble the phone. A malfunctioning battery itself can also contribute to this problem, though it's less common for this exact symptom. Full Reassembly: If the charging works, carefully reassemble your phone in reverse order, ensuring all screws and shields are replaced correctly. Preheating PCBs: Used in conjunction with an under-board preheater to bring the entire PCB to an elevated temperature before applying hot air from the top, reducing thermal shock and improving solder flow. The primary challenge in removing a broken charging port connector lies in its typical construction. The phone might get stuck in a boot loop, display a manufacturer logo indefinitely, or boot directly into recovery mode.

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