[SOLVED] I'm looking for VIDO M80 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my VIDO M80. 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.

@Jalal

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 VIDO M80 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/my-htc-u11-translucent-black-arrived-today.3709206/
Take a look at comment #446
Also, this : https://xdaforums.com/t/cwm-recovery-requirement-root.3731303/.
You can also check this video starting from minute 2:

The VIDO M80 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 VIDO M80 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 VIDO M80 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 VIDO M80 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/450006/Phone+wont+charge+or+turn+on

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

Understanding the intricacies of USB-C port repair is therefore crucial for maintaining the functionality of contemporary devices. Look for water damage indicators (LCI) if you are comfortable opening the phone, or seek professional inspection. This involves disconnecting all other flex cables (charging port, cameras, antennae) and removing all motherboard screws. When a smartphone suffers from liquid damage, or exhibits intermittent faults due to contamination, traditional cleaning methods with brushes and isopropyl alcohol (IPA) often fall short. Locate Battery Adhesive Tabs: iPhones typically use black adhesive pull tabs underneath the battery. Debris: Using a magnifying glass, meticulously inspect the entire screen mounting lip and surrounding frame for any traces of old adhesive residue, glass fragments, dust, metal shavings, or foreign objects. Application: Excellent for heavily oxidized battery contacts, FPC connectors, charging port pins, switch contacts, and areas affected by mild corrosion. Pre-Tin Pads (Optional but Recommended): Apply a tiny amount of fresh solder to each signal pad on the logic board. If you can feel a distinct groove, the scratch is likely too deep for DIY repair. Ensure they no longer wobble excessively and produce the correct volume changes. All old adhesive residue, oil, and dust must be meticulously cleaned from both surfaces before applying new adhesive for a strong, reliable bond. Specialized Apps: Developers and audio professionals sometimes use specific apps designed to measure audio buffer sizes, sample rates, and reported latency values. Use fine-tipped tweezers or a plastic spudger to gently pry up and disconnect this flex cable from its socket. Launch Calibration Software: Open the manufacturer's calibration software on the PC. Excessive heat: The point of the short, or the power management components trying to feed power into the short, will get very hot very quickly. It's a challenging but highly rewarding repair that can restore essential functionality to a smartphone, saving the cost and potential compatibility issues of a full flex replacement. Muffled Sound: The caller's voice sounds indistinct, as if speaking through a cloth, even at high volume. The faulty, hot component will cause the liquid to evaporate much faster than other parts of the board, making it visible. This provides mechanical stability, insulates the wire, and prevents shorts. Quality USB Cable: Use the original or a high-quality USB 2.0/3.0 cable. Blocked microphone ports will inevitably lead to muffled or inaudible audio. For example, on many iPhones, the display cables are often on the right side, so prying deeply there is a major risk. To prevent power consumption anomalies, regularly update your apps and operating system. This guide focuses specifically on the crucial initial steps: how to assess water-damaged smartphone components to determine the extent of the damage and inform subsequent repair decisions. If not, re-check connections or consider if the replacement part is faulty, or if the issue is deeper (e.g., motherboard component failure). Wi-Fi Module/Antenna Failure: The Wi-Fi module itself (an integrated circuit on the motherboard) or its associated antenna could be faulty. `adb logcat`: Streams system logs in real-time, potentially revealing processes that are frequently active. Phone won't turn on at all: Disconnect the battery and recheck all connections. Used to create a vacuum seal on the display or back glass, allowing you to pull and create a gap for your opening picks. Disconnect the battery first! (Always disconnect the battery before working inside a smartphone).

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