[SOLVED] I'm looking for JIVI Energy E12 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my JIVI Energy E12. 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.

@Hannah

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 JIVI Energy E12 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/Guide/How+to+disable+touchscreen+on+samsung+chromebook+plus/101905
Take a look at comment #723
Also, this : https://xdaforums.com/t/still-a-good-idea-buy-a-pixel-2xl.3810495/.
You can also check this video starting from minute 8:

The JIVI Energy E12 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 JIVI Energy E12 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 JIVI Energy E12 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 JIVI Energy E12 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/492178/Screen+bent+back+too+far

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

Case Removal: Always remove any phone case, especially thick or insulated ones, during testing. Splicing or repairing a damaged coaxial cable directly is extremely difficult due to the need to maintain precise impedance (usually 50 ohms) for optimal signal transmission. You might also hear the charging sound chime on and off, or feel the phone vibrate repeatedly as it attempts to connect and disconnect. Android: Settings > System > Reset options > Erase all data (factory reset). Correct: Replace faulty parts, re-seat connectors, or address the underlying issue. Reconnect any other flex cables (e.g., screen, front camera, vibrator). Look for shorts between adjacent pins, cold joints, or misaligned pins. Check for dust or fingerprints on the inside of the new camera lens cover. Conversely, some users might experience sound, but it is heavily distorted, crackling, or intermittently cutting out, regardless of the audio source or volume setting. Hydrophobic Coating (Optional): Many smartphone glasses come with an oleophobic (oil-repellent) coating that gets removed during polishing. The goal here is to remove the bulk without damaging the frame or the hinge. The reliance on advanced schematics and boardviews is paramount for successful repair at the component level.## 7. Professional Diagnosis: At this point, taking your phone to a reputable repair shop with micro-soldering capabilities is your best (and likely only) option. Extreme heat, cold, or moisture can damage batteries, adhesive, and electronics. Update Operating System (OS): Ensure your phone is running the latest version of its OS. Replacing a smartphone screen is one of the most common repairs, breathing new life into a cracked or unresponsive device. Universal tools exist, but model-specific ones offer the best precision. Precision Screwdriver Set: Essential for tiny screws (Phillips PH00/PH000, Pentalobe, Torx). For professional micro-repair, a stereo microscope is the undisputed king. If your phone has optical image stabilization (OIS), and it’s also failing, it might present similar symptoms, but a specific focus actuator issue will manifest primarily as an inability to acquire sharp focus. If using liquid adhesive, allow adequate curing time, typically 15-30 minutes before proceeding with reassembly, though full cure can take hours. A sudden surge of static electricity, even one too small for a human to feel (which is typically around 3,000 volts), can permanently damage the tiny, sensitive circuits within a smartphone. Slow and Steady: Soften the adhesive from the underside or edges, then carefully pry with plastic tools. After the adhesive has had sufficient time to cure (ideally 2-4 hours, or up to 24 hours for B7000 glue): Heat the chip gently with the hot air station until the solder paste reflows into perfect spheres (new solder balls). Disconnect the NFC flex cable connector from the logic board using a plastic spudger or tweezers. Force Restart: If the screen is too unresponsive to power off normally, perform a force restart. If the issue is universal, it's more indicative of a broader system software problem or a hardware malfunction. No Calibration (for independent repair): Just like Touch ID, there is no public "calibration" process that can re-establish the cryptographic pairing for a replaced Face ID component. Weak Jumper Wires: Jumper wires must be secure and properly insulated to prevent future failures.

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