[SOLVED] I'm looking for DOEASY V108 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my DOEASY V108. 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.

@Isaac

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 DOEASY V108 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/Guide/iPad+3+4G+Left+Cellular+Data+Antenna+Replacement/8744
Take a look at comment #80
Also, this : https://xdaforums.com/t/athena-camera-problem.422503/.
You can also check this video starting from minute 3:

The DOEASY V108 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 DOEASY V108 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 DOEASY V108 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 DOEASY V108 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/452679/Xbox+360+E+.Red+Light+ring+in+console

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

Booting into Safe Mode loads only essential system apps, disabling all user-installed applications. A working sensor should show a noticeable temperature increase under heavy load, then a gradual decrease once the load is removed and the phone cools down. As IPA evaporates quickly, the shorted component will heat up and cause the IPA directly on it to evaporate first, indicating its location. Another crucial diagnostic step is to differentiate between an issue with the microphone hardware and an issue with the cellular network or the recipient's phone. Apply Kapton tape to protect very nearby components if using hot air, although a fine-tip iron is often sufficient for these small components. Connect to Computer: Connect your iPhone to your computer using a USB cable. Many online developer communities and forums will have information regarding anti-rollback status for specific phone models and firmware versions. New Display Works Perfectly: The original display assembly (digitizer layer or its integrated controller) was faulty. Apply new adhesive for the screen or back cover if needed, and carefully seal the device. Check if the camera bump appears uneven, more prominent on one side, or if the lens itself looks misaligned within its cutout. Professional Repair: Given the complexity and importance of the internal frame, if you've identified a crack, it's often best to seek professional repair. Safety Glasses: Protect your eyes from debris, chemicals, and solder splatter. Liquid Damage: Certain liquids (especially water with impurities, sugary drinks, or solvents) can dissolve, degrade, or weaken adhesive bonds, compromising seals. Once a component suspected of ESD damage is identified, the repair process begins. This is an advanced BGA repair, involving de-soldering, reballing, and re-soldering the baseband IC. Incorrect screw length can either fail to secure a component or, worse, pierce the logic board or battery if too long. Reassemble & Test: Reinstall the motherboard, reassemble the phone, and test charging, temperature monitoring, and overall stability. Replacement Camera Module (Front or Rear, depending on which is failing): Ensure it's specific to your phone model. Modern fast-charging algorithms also adjust based on battery age and health to preserve its lifespan. Test both photo and video modes, checking for clarity, focus, and the absence of blur/shake that was present before. If it fails: If the bond breaks, you'll have a glue-filled screw head, making other methods harder. Apps Crashing/Slow: Apps installed on the SD card crash frequently, take a long time to load, or behave erratically. Graphical Glitches: While more commonly associated with GPU issues, severe RAM corruption can sometimes manifest as visual artifacts, distorted graphics, or screen flickering, especially during demanding graphical tasks. If not, you may need to apply a tiny amount of fresh solder to each pin with your iron, using flux. If the earpiece speaker was part of a flex cable with other sensors (like the proximity sensor), test those as well (e.g., during a call, does the screen turn off when held to your ear?). Apply Flux: Apply a small amount of liquid flux around the edges of the ISP. Flat Region (slope of 0): Indicates Bias Instability, the minimum point on the curve often corresponds to the optimal averaging time for minimizing bias error. Stuck pixels are sometimes fixable as the underlying hardware is still functional, just not responding correctly. This can sometimes reveal large, hidden folders or corrupt file structures. 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.

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