[SOLVED] I'm looking for Tecno Mobile Camon 15 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Tecno Mobile Camon 15. 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.

@Sara

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 Tecno Mobile Camon 15 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-noob-how-to-root-prestigio-multipad-7-0hd-pmp3870c_duo-tablet.2603696/
Take a look at comment #1347
Also, this : https://www.ifixit.com/Wiki/Gateway_NE56R49u_Troubleshooting.
You can also check this video starting from minute 5:

The Tecno Mobile Camon 15 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 Tecno Mobile Camon 15 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 Tecno Mobile Camon 15 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 Tecno Mobile Camon 15 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/creaky-black-lumia-920.2134740/

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

Remove Jewelry: Take off rings, watches, and bracelets, as they can scratch components, conduct electricity, and generate static. Repairing a damaged RF shield can range from a relatively straightforward mechanical fix to an advanced micro-soldering challenge. New Charging Control IC: Ensure it's the correct model number for your device. RAM (Random Access Memory) is crucial for a smartphone's performance, as it temporarily stores data that the CPU needs to access quickly. If you replaced a major component like the display, temporarily try the old one to rule out a defective replacement. Visually inspect the connections to confirm they are seated correctly. The only solution is to transfer the original sensor IC or entire flex cable to the new assembly, which is a micro-soldering challenge and carries high risk. Repeat: As the brush becomes dirty, clean it or use a fresh part of the brush/cotton swab. Inspect Under Light: Hold your phone at various angles under bright light. LCD/OLED Panel: The actual display component that generates the image. When the screen isn't securely seated within the phone's frame, it creates unsightly gaps, exposes internal components to dust, moisture, and potential damage, and significantly increases the risk of the screen detaching completely or cracking further upon impact. Performing a factory reset from recovery mode is particularly useful when the phone is experiencing severe software problems that prevent it from booting normally or accessing the regular settings menu, such as boot loops, constant crashes, or an unresponsive touchscreen. These spontaneous incidents often suggest a deeper conflict at the operating system or driver level interacting poorly with a hardware component. If only the speakerphone is distorted and other audio is fine, it's less likely to be the main audio IC and more likely to be components specifically in the speaker's signal path or the speaker itself. Battery Health Monitoring Utilities: Apps like AccuBattery (Android) or desktop tools like iMazing (iOS) can provide detailed battery cycle counts, estimated health, charge/discharge rates, and temperature. Diagnosing mainboard issues typically requires specialized tools like a microscope, multimeter, and potentially a hot air rework station for micro-soldering. These names often begin with "PP_" (Power Positive) for positive voltage lines, "GND" for ground, or descriptive names like "VCC_MAIN" (main power supply voltage), "CPU_CORE" (CPU core voltage), or "MIPI_DATA0_P" (a data line for the MIPI display interface). Loose connection: Ensure the battery's flex cable is securely seated on the motherboard connector. Use a soft, lint-free microfiber cloth to thoroughly clean the area around the earpiece, front camera, and the top bezel of your phone. Trim Excess (If Any): If the wire is too long, use a very sharp scalpel or flush cutters to trim any excess, being careful not to damage other components or the newly made solder joint. Thermal Camera: A thermal imaging camera can precisely identify hot spots on the logic board during charging. Heat gun or heating pad: To soften the adhesive holding the screen or back panel. The pads must be clean, flat, and shiny for the new IC to seat properly. Start with external checks and basic software troubleshooting, then move to rigorous manual testing and the use of diagnostic apps. Power On/Off via Software: If the screen is on and the button isn't working for sleep/wake, try using assistive touch or software power options (usually found in accessibility settings or by long-pressing a virtual power button if available) to power off and on. Try making calls to different numbers, especially landlines, to rule out network interference. A fundamental diagnostic tool is "Safe Mode." Booting your smartphone into Safe Mode loads only the essential system applications and drivers, disabling all third-party applications. Connectors: Smartphone logic boards are populated with tiny, sensitive flex cable connectors. Solder Wire: Ultra-fine gauge (0.2mm to 0.4mm) leaded solder (e.g., 63/37 Sn/Pb). Third-Party Monitoring Apps: These apps are invaluable for objective, real-time temperature readings:

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