[SOLVED] I'm looking for LAND ROVER P300 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my LAND ROVER P300. 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.

@Osvaldo

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 LAND ROVER P300 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/en-gb/Tools/iFixit_Exclusives
Take a look at comment #48
Also, this : https://www.ifixit.com/Answers/View/334728/Screen+is+dead.+Phone+is+on.
You can also check this video starting from minute 9:

The LAND ROVER P300 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 LAND ROVER P300 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 LAND ROVER P300 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 LAND ROVER P300 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/Answers/View/346491/My+laptop+didnot+save+date+and+time+after+shutdown

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

This points to an issue with the internal speaker(s), speaker grille, or the phone being "stuck" in headphone mode. In cases of severe logic board damage, professional micro-soldering repair might be required, which goes beyond simple oxidation removal. What it is: Oxidation is a chemical reaction that occurs when metals are exposed to oxygen, often accelerated by moisture. If you choose to proceed, carefully follow a reliable teardown guide for your specific smartphone model to gain access to the motherboard and camera modules. Full Reassembly: If tests are successful, proceed with full reassembly. Remove Mid-Frame Components/Shields: Unscrew any plates, brackets, or shields that cover the logic board and underlying flex cables. Once the initial panel is removed, you will likely encounter a metal shield or plastic mid-frame secured by numerous small screws. Search for the stock firmware (often a large .zip, .tar, .img, or .md5 file) that matches your model number and region. Bent or Damaged Pins: Especially relevant for older micro-USB or USB-A ports, but even USB-C ports can have damaged contacts. Slight variations can lead to poor fitment, uneven adhesive bonding, and compromised water resistance. Schematics/Boardview (Optional but helpful): To identify power lines and suspect areas. For older devices, a few stuck pixels might be an acceptable trade-off for a lower price, but their presence should always be noted. After wicking, clean the area thoroughly with IPA and a lint-free swab under the microscope. The SIM tray slot is typically located on one of the side edges of your smartphone, or sometimes on the top edge. Adjacent Components: Recheck capacitors, resistors, and filters around the Network IC. The method of accessing and replacing the bezel depends heavily on how your phone is designed to open (from the back or the front, by removing the screen). Flex Cable Damage: The proximity sensor is often part of a larger flex cable assembly that includes the front camera, earpiece, and ambient light sensor. Hot Air Rework Station: With precise temperature and airflow control, crucial for safely de-soldering and re-soldering BGA components. Once cooled, clean the area thoroughly with IPA to remove all flux residue. Compare the bent pins to the adjacent, correctly aligned pins to gauge the proper orientation and height. The causes of NFC communication faults can range from simple software glitches to significant hardware damage. Disconnect Connectors (if applicable): For some Fairphone models, the display module might have a flex cable connecting to the main board. Marketplaces (eBay, Amazon, Alibaba, AliExpress): These are high-risk platforms for parts. These powerful programs bridge the gap between user-reported issues and the intricate internal workings of a device, enabling technicians to diagnose problems with greater speed, precision, and confidence. Component Failure: Battery failure, power management IC (PMIC) failure, storage chip (eMMC/NAND) failure, CPU issues. Remove Screws/Clips: Some antenna modules might be secured with small screws or clips in addition to adhesive. Use the `CSC` file to factory reset, or `HOME_CSC` to retain data (if possible). This would require micro-soldering and detailed schematic diagnosis, which is generally rare after a screen replacement. The back of the phone, especially over the coil area, feels significantly hotter than expected during charging, or much hotter than when charging via cable. For years, 60Hz was the standard, meaning the screen updated 60 times per second.

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