[SOLVED] I'm looking for VIDA I553 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my VIDA I553. 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.

@Nasir

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 VIDA I553 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/status-bar-being-blanked-out-on-home-screen-app-drawer.3621976/
Take a look at comment #1557
Also, this : https://xdaforums.com/t/hardware-keyboard-is-broken.549797/.
You can also check this video starting from minute 5:

The VIDA I553 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 VIDA I553 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 VIDA I553 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 VIDA I553 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/755818/Turn+on+after+being+off+for+long+time

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

Keep Your OS Updated: Operating system updates often include thermal optimizations, bug fixes, and improvements in power management. Durability: High-quality tempered glass protectors offer significant durability. Identify Camera Module(s): Locate the front and/or rear camera modules. If they continue to haggle aggressively or refuse to pay a fair rate, politely decline. Compressed Air: For blowing away loosened residue and ensuring thorough drying. Replacing the magnet assembly in a wireless charging smartphone is a meticulous process that demands patience and attention to detail. If the flex cable itself is torn or damaged, it will need to be replaced entirely. This is invaluable for finding shorts on power lines and evaluating the health of components. Note: Diagnosing and repairing motherboard-level SIM IC faults usually requires schematics and specialized equipment (multimeter for continuity/voltage checks, oscilloscope). Apps Sideloaded from Untrusted Sources: Avoid installing apps outside the App Store unless you fully understand the risks. Scrubbing: While submerged or after removing from the bath, use a soft-bristle brush (like a clean, dry toothbrush) to gently scrub all affected areas on the logic board, especially connectors, chips (ICs), and any areas with visible corrosion. While you're at it, take the opportunity to carefully clean any exposed flex cable connectors, the charging port, speaker grilles, and microphone holes that might have accumulated dust or debris during the repair process. Antenna Flex: Poor signal strength, no cellular service, weak Wi-Fi/Bluetooth. Perform a standard restart or a force restart (refer to your phone's manual for specific instructions, as it often involves holding down volume and power buttons). This combination can vary slightly by device, but commonly involves the Power and Volume buttons. If you choose to proceed, carefully follow a reliable teardown guide for your specific smartphone model to gain access to the motherboard and camera modules. Full Reassembly: If the test is successful, carefully reassemble the device. These connectors are often "press-fit" and just need to be gently lifted straight up. For phones supporting USB OTG (On-The-Go), you can connect a USB flash drive directly to your phone and transfer files to it. Check for Swelling: Visually inspect your phone for any signs of battery swelling. A healthy Baseband is paramount for a phone's most fundamental feature: its ability to act as a phone. Gently remove and reseat the camera module's flex cable connector on the logic board, ensuring it's properly aligned and fully seated. It allows you to simulate a battery, monitor current draw in real-time, and limit current to prevent further damage. Antenna System Evaluation: Carefully inspect the main and diversity antennas, their contact points, and the coaxial cables for any damage or loose connections. By following these steps carefully, you can restore your phone's appearance and functionality, proving that a shattered screen doesn't have to mean a shattered budget.10. Excessive heat generation in both the phone and the charging pad is a strong indicator of misalignment or inefficiency. Factory Reset (Last Resort for Software): Back up all data and perform a factory reset. SIM Tray: The physical carrier that holds the SIM card and inserts into the device. Microphone (sometimes): In some designs, a secondary microphone might also be part of this flex. Burnt Components: Discolored or visibly damaged ICs or resistors near the connector, which could indicate a faulty motor driver IC.

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