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

Hi,

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

@Hubert

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 Max 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/Answers/View/875678/Fan+Housing+Assembly+-+where+can+I+buy
Take a look at comment #108
Also, this : https://xdaforums.com/t/help-please.484711/.
You can also check this video starting from minute 2:

The LANDVO Max 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 Max 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 Max 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 Max 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/albinomans-rom-inconsistent-video-recording-playback.2257833/

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

Small, sealable, clear plastic containers or compartmentalized organizers will help keep parts sorted and protected from physical damage. If the baseband firmware is missing or all else fails, the issue is likely a serious baseband chip failure on the motherboard, which usually requires professional (and often costly) micro-soldering repair, or may simply mean it's time to consider a new device. Over time, or due to drops and vibrations, tiny internal screws can loosen or detach completely. Internal Component Failure: The flexible circuit board (flex cable) that houses the volume button switch can fail due to age, manufacturing defect, or damage during a previous repair. Water Resistance: Be aware that replacing the camera lens cover, especially if the phone originally had an IP water resistance rating, will likely compromise that rating. The proximity sensor reading should change (e.g., from "far" to "near" or a numerical value changing). For ICs, increased temperature can alter electrical characteristics, potentially causing it to draw more current or regulate voltage improperly. Go to Settings > System > Backup (or similar path, varies by device manufacturer). The symptoms of signal band switching issues are varied but generally revolve around unstable or poor network performance: Backup Data (if possible): If the phone is still accessible, back up any important data. A key reason for their enhanced capabilities, particularly in capturing sharp photos and smooth videos, lies in advanced stabilization technologies. Navigate using volume keys and select "Wipe cache partition" (do NOT select "Wipe data/factory reset" yet). Any visible bends, dents, or warping can create small gaps between the screen/back panel and the frame, compromising the adhesive seals. Audio IC (Codec) Malfunction: The Audio IC (or Codec chip) is the main processor for all audio signals (input from mics, output to speakers/headphones). Carefully remove the stencil, lifting it straight up to avoid smudging the paste. Reassemble & Test: Reassemble the phone and test charging, temperature monitoring (via diagnostic apps), and overall stability. Standard Repair Toolkit: Precision screwdrivers, spudgers, tweezers, suction cup, heat gun/plate. Screen Fit: Check that the screen sits flush with the frame, with no lifting or gaps. This reduces the risk of bubbles, uneven curing, and stress on components. Clean and Prepare: Ensure the sanded and polished area is perfectly clean and dry. Apply hot air in a slow, continuous, circular, or sweeping motion over the entire interposer seam. Erratic Touch Response: Touch input is delayed, inconsistent, or registers in the wrong location. Clean Workspace: Prevents contamination of internal components and helps you spot tiny parts. Oxidation: Exposure to moisture (even humidity) can cause the metal pins to corrode, forming green, white, or blue powdery residue. Preliminary Test: Before fully sealing the phone, it’s wise to perform a quick test. Anti-Static Precautions (ESD): Work on an anti-static mat and wear an anti-static wrist strap, connected to ground. Sound lacks depth, bass is almost non-existent, and overall clarity is reduced because sound waves are escaping or reflecting incorrectly within the phone. When a short circuit occurs, the voltage applied to that line drops to near zero, and a large current flows through the path of least resistance , which is usually the faulty component that has failed and become a direct path to ground. If a pad lifts, the repair becomes significantly more complex, requiring trace repair. Plastic Opening Tools (Spudgers): Useful for disconnecting any flex cables.

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