[SOLVED] I'm looking for CTRONIQ Snook C75s repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my CTRONIQ Snook C75s. 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.

@Laure

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 CTRONIQ Snook C75s 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/google-music-start-playlist-playback-activity.3184809/
Take a look at comment #666
Also, this : https://www.ifixit.com/Answers/View/179072/Value+of+D1041+on+power+supply+board+for+Panasonic+PV+D4744S+VCR.
You can also check this video starting from minute 1:

The CTRONIQ Snook C75s 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 CTRONIQ Snook C75s 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 CTRONIQ Snook C75s 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 CTRONIQ Snook C75s 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/Guide/HP+Pavilion+14-bk061st+Battery+Replacement/131765

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

Are they straight and uniformly spaced? Bent pins are a very common issue, often caused by improper reassembly, drops, or forceful connection of the battery flex cable. Use a Protective Case: A good case can absorb shock and protect your phone's internals. They may be labeled with "TP" followed by a number (e.g., TP101) or a descriptive name on schematics, though they are often unlabeled on the physical board. Muffled or Distorted Voice: Your voice sounds unclear, static-y, or very quiet to others. This module relies on external antennas (often thin flex cables or traces on the PCB) to transmit and receive signals. Heat gun or hair dryer: To soften adhesive holding the back cover or screen, if applicable. Precision Screwdriver Set: Including pentalobe, Phillips, and tri-point bits. Are pins bent, broken, or corroded? Is the plastic housing damaged? This helps determine the repair strategy. Always source screens from reputable suppliers that guarantee the advertised specifications. Broken Pin (on motherboard): The pad and the underlying copper trace on the motherboard are completely torn off or corroded away, leaving a void. Consumer Awareness: As repairability scores become more prominent, consumers are becoming more aware of device longevity and the environmental impact of their choices. Make sure the small internal button switch is correctly seated beneath the external button cap, allowing for proper tactile feedback. Dust and Debris: Accumulation of dirt, lint, makeup, or earwax in the earpiece grille or over the sensor's window can block the IR light, making the sensor think there's always an object nearby or fail to detect one. At this point, consulting a professional repair technician specializing in mainboard-level repairs is advisable. If the new battery also drains rapidly, the issue is with the phone itself. Demanding Unrealistic Timelines: Rushing complex repairs compromises quality and increases the risk of mistakes. Thermal Stress on Components: Prolonged heat exposure isn't just a risk for the screen; it can also stress other internal components near the edges of the display, such as flex cables, sensors, and even the battery, potentially reducing their lifespan or causing latent failures. When molten solder wets the metallic surfaces, atoms from the solder and the base metal diffuse into each other, forming a thin, strong metallurgical bond. Metal Clips: Small, spring-loaded metal pieces (often integrated into the frame or separate components) that apply pressure to hold parts together. Removing the screen assembly: (Common for iPhones) Heat the screen edges, use a suction cup and thin pry tool. Visual Inspection: Look for physical damage (frayed wires, bent prongs, scorch marks). UV Curing Solder Mask/Epoxy: After bridging, this liquid mask is applied over the repair and cured with a UV light. Regular Cleaning: Make it a habit to clean your workbench daily or after each major repair. Initial Power-Up and Test: Before fully sealing the phone, power it on. Water Damage: Corrosion on the flex cables or within the components can cause shorts or open circuits. Factory Reset (Last Resort for Software): Back up your data, then perform a factory reset. If comfortable and experienced, power on the device (with DC supply) and measure voltages around the backlight driver IC. It demands exceptional patience, a steady hand, meticulous attention to detail, and the right tools. As soon as the phone is open, locate and disconnect the battery connector from the logic board. Initial State: Before bonding, the adhesive is non-conductive, and the particles are too far apart to establish electrical contact.

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