[SOLVED] I'm looking for OPSSON P6 PLUS repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my OPSSON P6 PLUS. 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.

@Darlene

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 OPSSON P6 PLUS 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/672395/What+to+do+with+a+punctured+phone+battery
Take a look at comment #253
Also, this : https://xdaforums.com/t/display-turning-off-after-5-seconds-after-notification-how-to-extend-the-display-going-back-to-sleep-too-soon.4298397/.
You can also check this video starting from minute 5:

The OPSSON P6 PLUS 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 OPSSON P6 PLUS 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 OPSSON P6 PLUS 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 OPSSON P6 PLUS 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-ruined-evo-4g-please-help.1354118/

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

It requires a steady hand, specialized tools, extensive practice, and a deep understanding of soldering techniques. If you are not confident in your abilities, it is strongly recommended to seek professional repair services or consider device replacement. If the RAM corruption symptoms persist under these conditions, it provides strong evidence of a hardware RAM fault. Inspect and Re-seat Display Flex Cables: Once the phone is open, locate the display and digitizer flex cables that connect the display assembly to the mainboard. With a schematic, you can probe these data lines (using an oscilloscope if available, to check for signal activity) to determine if the sensor is responding to the SoC's queries. Cover the top part of the phone (where the sensor is located) with your hand. Before replacing a blown fuse, it is paramount to identify and fix the underlying short circuit. This is particularly true for screws that hold down flex cable shields, which often sit directly over sensitive ICs or traces. Once the cutting is complete, gently lift the cracked glass away from the digitizer/LCD assembly. Component Shields: Remove any EMI shields covering the components on the outer surfaces of the boards that are easily accessible. Reflow Solder Balls: Use the hot air station (lower temp, e.g., 250-300°C, low airflow) to reflow the solder paste into perfectly spherical, uniform solder balls. These physical buttons or rotational inputs provide tactile feedback and direct control over device functions, from navigating menus to adjusting volume or powering on/off. Without access to this partition, the phone cannot load the operating system. Correct Fuse Rating: Always replace a fuse with one of the identical voltage and current rating. If a significant piece of the PCB corner was physically missing, the repaired area can be reinforced using a specialized epoxy or additional layers of UV-curable resin. Position the New Port: Using tweezers, carefully align the new USB-C port over the pads. Microscope: A stereo microscope (e.g., AmScope, Aven) is indispensable for detailed inspection and precise work on small components. It's almost impossible to fix without re-doing the entire separation and bonding process in a clean room environment. If the repair progresses to internal disassembly, it is crucial to disconnect the battery immediately after gaining access to prevent any short circuits or damage to the logic board. Heat source: A heat gun, hair dryer, or iOpener to soften adhesive (if the screen or back cover is glued). Be extremely cautious of delicate ribbon cables connecting the display. Be extremely cautious of flex cables that connect these panels to the main board; ripping them can cause further damage. Removal of Old Connector: A high-quality hot air station is used for this step. Perform a comprehensive test of all phone functions, especially the camera. Many antennas are integrated into a plastic frame or a flex cable that wraps around the phone's perimeter. Clean the Area: Thoroughly clean the area where the new grille will sit. While it demands careful disassembly, particularly with screen removal, it can restore crucial functionality to your smartphone. Avoid Extreme Temperatures: Both excessive heat and cold can degrade battery health and performance. Slow Performance/Lag: General sluggishness, slow animations, apps taking a long time to open. If there are issues, you may need to apply more flux and gently reheat the chip to reflow the balls, or even remove all balls and restart the reballing process.

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