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

Hi,

I'm hoping you can help me out with my YINGTAILONG Slide Fashion. 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.

@Jana

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 YINGTAILONG Slide Fashion 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/641068/No+modem+firmware+and+searching+always
Take a look at comment #1403
Also, this : https://xdaforums.com/t/move-all-system-apps-to-sd-ext-into-official-galaxy-ace-s5830-stock-gb-firmware.2133314/.
You can also check this video starting from minute 7:

The YINGTAILONG Slide Fashion 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 YINGTAILONG Slide Fashion 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 YINGTAILONG Slide Fashion 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 YINGTAILONG Slide Fashion 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/q-problem-with-rom-jedi-mind-trick-v9-please-help.1936064/

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

By understanding current signatures, setting appropriate limits, and combining this with schematic analysis and thermal imaging, technicians can systematically identify and repair even the most complex board-level power issues, turning seemingly unrepairable devices into functional ones. A fall can bend the frame, transferring stress to the motherboard and damaging internal connections. These carry signals and power and can act as antennas if damaged or improperly shielded. Clean them gently with isopropyl alcohol and a soft brush if necessary. Waterproofing Seals: Many modern phones have IP ratings for water resistance, achieved through intricate seals and adhesives. Avoid Overheating: Don't leave your phone charging in direct sunlight or on heat-retaining surfaces. If the screen is already damaged, take extra care to avoid further breakage or injury. The Taptic Engine is Apple's proprietary name for its advanced haptic feedback system, but the term is often used generally for the vibrator motor in any smartphone. Apply Kapton tape to any extremely sensitive components immediately surrounding the BGA chip to protect them from excessive heat, if necessary. Cool and Remove Stencil: Let it cool, then carefully remove the stencil. Test in Safe Mode: Boot the phone into Safe Mode (varies by manufacturer). Electrical Contact: It contains tiny gold-plated pins that make electrical contact with the metallic pads on the SIM/SD card, allowing the phone's logic board to read and write data to/from the card. Be extremely cautious not to get paste on other components, as some pastes can be mildly conductive. Corrosion: Green or white deposits often indicate liquid damage, which can eat away at ground traces or pads. Recalibrate Sensors (if available): Some Android phones offer a sensor calibration option in settings (often in developer options or specific diagnostic menus). If photos are distorted even after cleaning the lens, the internal camera module might be faulty, which is a different, more complex repair. They feature an electronic display that shows the measurement digitally, often with a resolution of 0.01mm (or 0.0005 inches). Exercise extreme caution when downloading firmware, ensuring it is for your exact model and region. Use Immersive Mode: For apps that support it, immersive mode hides the status and navigation bars, allowing content to take up the full screen. An error caused by a faulty barometric pressure sensor can lead to a range of perplexing issues that might not immediately point to this specific component, requiring systematic and advanced diagnostic techniques. Damaged Flex Cable: A new flex cable can be damaged during installation if bent too sharply or pulled too hard. Internal Knowledge Base: A repository for common issues, successful fixes, and lessons learned, helping train new technicians and improve consistency. Software Issues: Malicious apps, poorly optimized applications, or software bugs can cause the CPU to run at high loads in the background unnecessarily, leading to constant heat generation. Even without outright corrosion, a dull or tarnished appearance of the metal contacts can be a sign. Replace Brackets and Screws: Reinstall all metal brackets and small screws in their original positions. Screen Protection: If the foldable screen is still attached or partially attached, ensure it is completely shielded from any solvents or accidental contact with tools during the cleaning process. Slow and Steady Removal: Once the adhesive is weakened, continue to gently pry the battery. For phones with a removable back glass, the screen generally remains attached to the front frame. Damage to this IC (e.g., due to drops, liquid damage, or ESD) can cause the baseband to fail. Losing data from a non-functional smartphone is a stressful experience.

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