[SOLVED] I'm looking for KALIHO T103 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my KALIHO T103. 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.

@Victor

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 KALIHO T103 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/762841/Why+do+I+keep+blowing+the+ceramic+fuse
Take a look at comment #1521
Also, this : https://xdaforums.com/t/blu-studio-5-0-jellybean-infection.3258696/.
You can also check this video starting from minute 2:

The KALIHO T103 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 KALIHO T103 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 KALIHO T103 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 KALIHO T103 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/658036/No+image+showing+up,+but+everything+else+works,+what+problem+it+is

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

Manufacturing Defects: Poor quality PCB materials or inadequate design for stress distribution. High Refresh Rate: Phones with 90Hz, 120Hz, or higher refresh rates consume more power. Account Issues: Problems with your carrier account, such as an overdue bill, service suspension, or a data plan change, can sometimes manifest as a provisioning error. Aftermarket: Shorter battery life, rapid discharge, inconsistent charging, or early battery health degradation warnings. Apply a small amount of UV glue or epoxy around the base of the new U.FL connector (avoiding the actual solder points) to firmly secure it to the board, preventing future dislodgement. Always source screens from reputable suppliers that guarantee the advertised specifications. Establish a Warranty Process: Understand your supplier's warranty and return policy. The RF transceiver IC is usually a small, square-shaped chip, often shielded by a metal cover. This can be achieved using specialized phone clamps or by carefully placing the phone between heavy, flat objects (like books) for several hours, typically 2-4 hours, or even overnight. The Charging IC, sometimes referred to as the Tristar IC (on older iPhones, specifically for USB data and charging port management) or a dedicated Power Management IC (PMIC) sub-component, performs several vital functions: Near 0V / Short: A reading close to zero on a non-ground pin indicates a short circuit to ground. Replacement (if damaged): If an antenna flex cable is visibly damaged, replacing it can resolve the issue. Carefully heat the edges of the screen (using a heat gun or heating pad) to soften the adhesive. Test with Multiple NFC Tags/Readers: Try using your NFC with a different payment terminal, another NFC tag, or a different NFC-enabled device. Despite the attractive rewards, DIY smartphone screen repair is far from a trivial undertaking. Black Screen: The screen remains black, but the phone might vibrate, show an LED light, or respond to power button presses (soft brick). Connect the flex cable securely to its connector on the logic board, ensuring it's fully seated and any latches are closed. Test in Safe Mode (Android): Booting into safe mode temporarily disables third-party applications. If poor audio persists across all outputs (internal speakers, headphones, Bluetooth) even after a factory reset, and the problem is not network/file-specific, it might indicate a failure of the Audio IC (Integrated Circuit) chip on the phone's logic board. Echo during calls: You hear your own voice or the other person's voice echoing. Faulty Charging Port: (See Topic 1) Damaged pins or corrosion can cause intermittent or slow charging. Always ensure your phone is adequately charged (at least 50%) before attempting any software flashing procedures to prevent further complications. Carefully align the new connector precisely over the clean solder pads on the logic board. Live With It: For very minor, almost imperceptible bleeding, many users choose to live with it, especially since it's only truly noticeable in specific dark viewing conditions. Do not insert it deeply or use it to pry extensively, as it can scratch the frame or damage internal components. It can also be influenced by the quality of the components used in the power delivery system. In some cases, the camera module might be lightly adhered to the frame or motherboard with a small amount of double-sided tape; gently pry it up with a plastic tool. The power button is arguably one of the most fundamental physical controls on a smartphone. For very small parts like buttons, SIM trays, or screws, use small, labeled Ziploc bags. Flex Cable Integrity: If the microphone is on a flex cable (e.g., charging port flex for the primary mic, front sensor flex for a secondary mic), inspect the flex for any damage.

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