[SOLVED] I'm looking for KIVI KC101 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my KIVI KC101. 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.

@Sedat

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 KIVI KC101 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://xdaforums.com/t/q-a-good-rom.981659/
Take a look at comment #1050
Also, this : https://www.ifixit.com/Answers/View/418811/Will+a+2012+Razer+Blade+Pro+LVDS+Cable+work+on+a+2015+model.
You can also check this video starting from minute 9:

The KIVI KC101 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 KIVI KC101 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 KIVI KC101 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 KIVI KC101 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/667482/Galaxy+S6+motherboard+replacement+of+G920A-W8

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

The causes of smartphone screen flickering can be broadly divided into software-related and hardware-related categories. Update Software: Ensure the operating system and all apps are up to date. Transfer Components (if applicable): Transfer the earpiece speaker, front camera, sensors, and any other components from the old display assembly to the newly bonded LCD/glass assembly. However, some state laws may still view any manipulation of device identifiers suspiciously, requiring robust documentation. Thin Plastic Cards (e.g., playing cards, credit card scraps): Useful for working under edges. iOS devices are generally more resistant to traditional malware due to Apple's strict sandboxing and app review process. If you suspect a motherboard issue, it is highly recommended to seek a professional repair service that specializes in micro-component repairs, as attempting it yourself without the proper tools and expertise can lead to irreparable damage. The method for accessing and replacing the camera filter varies significantly. A short on the anode line, especially, can indicate a faulty diode, coil, or even the driver IC. Damage Prevention: Proper mounting protects the motor from physical shock and prevents it from detaching during drops. Observe the chip for the characteristic "settling" motion as the solder melts and surface tension pulls the chip into perfect alignment. Capacitors are vital components in any electronic circuit, primarily serving to store electrical energy, filter noise, and stabilize voltage. Speakerphone only: If distortion is only on speakerphone, the main loudspeaker or its circuitry might be the culprit. Carefully position the new audio jack board/flex cable assembly into its designated spot. Front Camera (Face ID/Biometrics): If the front camera is involved in facial recognition (e.g., Apple's Face ID) or other biometric security, test this functionality. A magnetic mat or small containers are helpful for keeping track of tiny screws, which often vary in size and length. If the problem persists, try booting your phone into Safe Mode (the procedure varies by manufacturer, but usually involves holding down the power button and then tapping and holding "Power off" until the Safe Mode option appears). Research your phone's 5G bands: Check the manufacturer's specifications (official website, GSMArena, etc.) for the specific 5G NR bands (e.g., n1, n3, n78, n260, n261) supported by your phone model. Place one probe on a switch contact and the other on the corresponding pin of the FPC connector. If software troubleshooting fails, the problem is almost certainly hardware-related. This prevents accidental short circuits while working on the internals. With the tray fully inserted, run your finger gently across the phone's frame where the tray sits. Gently nudge the IC with tweezers to confirm it's seated properly and the solder has reflowed. Wi-Fi: Is the Wi-Fi router functioning correctly? Are other devices having issues with the same network? Reboot the router. You'll likely find a capacitor, an IC, or another component heating up. Gently disconnect the flex cable that connects the motor to the motherboard using a spudger. No Reversible Fix: Unfortunately, true burn-in (permanent image retention) is a hardware issue and cannot be reversed by software or simple fixes. Apply Clamps (for adhesive cure): Use phone clamps or rubber bands to apply gentle, even pressure around the edges for at least 3-4 hours (for adhesive strips) or 12-24 hours (for B-7000 glue) to allow the new adhesive to cure properly. If the lines DO appear in the screenshot: This points towards a software problem, a faulty GPU, or an issue with the data processing on the logic board. However, packing such power into a slim, fanless chassis presents significant thermal challenges.

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