[SOLVED] I'm looking for Itel P38 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Itel P38. 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.

@Jeff

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 Itel P38 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/621714/Touch+Not+Working+after+Digitizer+&+FPC+Connector+Replacement
Take a look at comment #681
Also, this : https://xdaforums.com/t/waze-xap.2850091/.
You can also check this video starting from minute 7:

The Itel P38 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 Itel P38 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 Itel P38 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 Itel P38 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/app-ultimate-pro-for-star-pro.3092350/

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

The "Package Installer" is a crucial system application on Android phones responsible for parsing and installing application packages (APKs). Bent/Deformed Metal Clips: If metal clips are integrated, they might be bent out of shape. Compatibility: While aftermarket parts aim for compatibility, subtle differences can lead to issues like software warnings, reduced functionality, or physical fitment problems. Smartphone microphones are essential for nearly all forms of communication and interaction with your device, from making calls and sending voice messages to using voice assistants and recording videos. The exact time will vary based on the phone model, adhesive strength, and heat gun power. Carefully align the new display assembly with the phone's frame, ensuring the top portion seats correctly first, then gently press down along all edges to secure the adhesive. The consequences of misusing a customer's passcode or violating their privacy are severe: Use a hot air rework station (refer to Topic 5: How to remove a soldered component with hot air) to heat and carefully remove the faulty component. Start by verifying the host phone's own cellular data connectivity and then systematically troubleshoot software, configuration, environmental factors, and connected devices. Their precise placement behind small, clear windows on the phone's glass is critical for their accurate operation. Voice Memos/Recorder App: Record a voice memo in a quiet environment, then in a noisy environment. Use isopropyl alcohol and a lint-free cloth or cotton swab to remove any old adhesive residue, dust, or grime. Swelling: Any sign of swelling warrants immediate replacement due to safety risks. Modern smartphones boast impressive levels of water and dust resistance, typically indicated by an IP (Ingress Protection) rating like IP67 or IP68. Pros: Best possible pricing, direct control over specifications, potential for custom orders. Liquid Damage/Corrosion: Look for any signs of liquid ingress, corrosion (greenish or whitish residue), or debris on or around the Hall sensor and its connections. Ensure all display flex cables (LCD and digitizer) are securely connected to the motherboard. Restart at Specific Percentages: Does the phone tend to restart when the battery reaches a certain low percentage (e.g., 20-30%)? This is a classic sign of a degraded battery struggling to deliver enough voltage. Factory Reset: If all else fails on the software side, a factory reset (after backing up data) can rule out deep-seated software corruption. The cold plate method (often involving a specialized freezer separation machine or simply placing the phone in a very cold environment, like a deep freezer with specific preparations) aims to achieve the opposite effect. Crucial Precaution: Always power off your phone and disconnect the battery before attempting any internal inspection or repair to prevent short circuits and electrical damage. Repeat for Durability: Many kits recommend applying 2-3 coats for better durability and effectiveness. Magnifying Lamp/Task Light: Even with a microscope, a flexible magnifying lamp with bright, flicker-free LED lighting is useful for general inspection and smaller component work. Test in Different Locations: Move to an open area, outdoors, or near a window. Conversely, it might shut down due to perceived "underheating" in extreme cases, though less common. If your phone has a non-removable battery, it's advisable to discharge it below 25% for safety. Manufacturers often release updates that include sensor calibration improvements or bug fixes. Hot Air Rework Station (if soldered): Essential for safely desoldering and soldering surface-mount components to the motherboard. Heat Management: Practice on scrap boards to get a feel for your hot air station's settings. The impact of flickering extends beyond mere aesthetics; it can cause eye strain, headaches, and significantly reduce productivity or enjoyment when interacting with the device.

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