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

Hi,

I'm hoping you can help me out with my INNJOO Leap. 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.

@Birgit

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 INNJOO Leap 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/180012/Coffee+ruined+keyboard,+works+with+external+keyboard.+Repair-replace
Take a look at comment #327
Also, this : https://www.ifixit.com/Answers/View/455443/please+identifying+logic+board+component.
You can also check this video starting from minute 1:

The INNJOO Leap 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 INNJOO Leap 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 INNJOO Leap 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 INNJOO Leap 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/q-missing-apps-in-go-launcher-ex.2635146/

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. Type: An elastic wrist band with a coiled cord and a built-in 1-Megaohm safety resistor. Once the bulk of the residue is gone, moisten a corner of your microfiber cloth with a small amount of isopropyl alcohol. Apple's ecosystem is more closed, so fewer third-party tools exist, and official ones are paramount. Factory Reset (Last Software Resort): If all else fails on the software side, perform a factory reset. This guide will focus primarily on troubleshooting the loudspeaker, as weak output from the earpiece is often a separate issue, though some diagnostic steps overlap. Symptoms of Being Stuck: The phone repeatedly boots directly into the Recovery Mode menu, or it might get stuck on a screen showing an Android logo with an exclamation mark (often requiring a specific button combination to enter the menu). Reinstall Shield: Place the metal shield back over the connectors and secure it with the correct Phillips and/or Tri-point screws. It should sit flush in its designated spot, neither protruding nor recessed abnormally. New Micro-Inductor: CRITICAL: Must be an exact match in inductance (nH or µH), current rating (Amps), and physical size. Removing it usually requires careful prying or heating, as it's often glued or bracketed to the back of the display. Android (Varies): Some Android phones open from the front (screen), others from the back. Apply the coating in even, sweeping passes, moving the can constantly to avoid concentrating the spray in one spot. By carefully following these diagnostic steps, most users can identify whether the problem lies with their charger, phone case, or the phone's internal wireless charging coil. Drops and Impacts: Physical shock can cause these brittle plastic clips to snap or become dislodged. Keep it Cool: Do not leave your phone in direct sunlight, in a hot car, or near heat sources. New Adhesive Strips: For re-sealing the display and maintaining water/dust resistance (if applicable). Losing Screws: A magnetic mat with labeled sections for different screw types/locations is invaluable. Less Risk of Thermal Stress: By avoiding high temperatures, there's no risk of thermal damage to flex cables, sensors, or other heat-sensitive internal components. Scratches/Dents: Inspect for any new scratches, scuffs, or dents introduced during the repair. Organized Workspace: Use a magnetic mat or screw organizer to keep track of tiny screws. Before embarking on this delicate journey, it's crucial to understand the high level of complexity involved and to acknowledge that improper execution can lead to irreparable damage to the motherboard, essentially bricking the device. Test in Safe Mode: If the "Process system isn't responding" error doesn't appear in Safe Mode, it strongly suggests a third-party app is the culprit. A rooted device, especially one with a tripped Knox counter or permanently unlocked bootloader, might have a lower resale value as it can deter potential buyers concerned about security, warranty, or the ability to receive official updates. By setting up a controlled environment, utilizing a range of test patterns, and systematically observing different color ranges and gradients, users can accurately assess their device's color fidelity. Android (general): Typically, press and hold the Power button for 10-30 seconds. Logic Board Installation: Carefully place the logic board onto its mounting posts in the new frame. Take identical photos (same subject, same lighting, same angle) with the suspect phone and a known good phone of the same model. Clean the Frame: Scrape off all remnants of the old adhesive from the phone's frame using a plastic pry tool and/or a cotton swab lightly dampened with IPA. These micro-fractures might not manifest immediately but can cause intermittent problems or complete failure later.

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