[SOLVED] I'm looking for Sony Xperia 1 J9110 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Sony Xperia 1 J9110. 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.

@Ivy

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 Sony Xperia 1 J9110 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/660728/freezer+and+fridge+are+not+cold,+but+the+fridge+is+still+running.
Take a look at comment #313
Also, this : https://xdaforums.com/t/wireless-charging.3067745/.
You can also check this video starting from minute 7:

The Sony Xperia 1 J9110 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 Sony Xperia 1 J9110 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 Sony Xperia 1 J9110 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 Sony Xperia 1 J9110 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-galaxy-tab2-5113-send-apps-to-ex-sd-card.2304804/

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

Effectiveness on Strong Adhesives: Heat is highly effective at softening even the strongest, most resilient adhesives, including those used in many waterproof and premium devices. Display Connector: A Flexible Printed Circuit (FPC) connector that carries the high voltage and current from the backlight driver to the LED array within the display assembly, along with display data lines. Factory Reset Protection (FRP): For Android devices running 5.1 Lollipop or later, FRP is a security feature. Software Issues: Corrupted system files, operating system bugs, app conflicts, or malware. To enable Developer Options, go to `Settings > About Phone`, then tap "Build Number" seven times until a message confirms developer options are enabled. Some anecdotal evidence suggests that very slight, localized temperature changes can sometimes "unstick" pixels. This step is usually reserved for professionals or experienced DIY repair enthusiasts. The goal is to apply just enough heat to weaken the adhesive, not to melt plastic or cook internal components. A solid understanding of communication protocols and component functions is essential for successful diagnosis and repair.How to inspect smartphone vibration motor mounts Advanced Troubleshooting (Requires Disassembly - Proceed with Caution): For instance, if you suspect a specific wireless module, try temporarily disabling Wi-Fi, Bluetooth, or NFC individually to see if the overall system stability improves. If the "Cellular Standby" or "Phone Idle" categories show unusually high consumption, it suggests a hardware issue related to RF. Rooted/Modified Devices: If your phone is rooted, has a custom recovery (like TWRP), or has been otherwise modified (e.g., custom ROMs, unlocked bootloader), official Over-The-Air (OTA) updates are highly likely to fail. Excessive heat: Applying too much heat during nearby soldering or desoldering operations can melt the plastic insulation or deform the cable. Carefully inspect the phone's back panel or screen for any bulging or separation from the frame. How: Place a small piece of a rubber band (or a finger from a latex glove) over the stripped screw head. They would also examine surrounding components like the PMIC and display driver IC for any visible signs of damage or overheating. Grainy/Noisy Images: Especially in good lighting conditions where noise should be minimal. Voltage Adjustments: For undervolting, decrease voltage in tiny steps. First Boot: The first boot after flashing new firmware can take a long time (5-15 minutes or more) as the system initializes. Replacing the microphone mesh requires precision and a delicate touch, as the microphone itself is very small and fragile. This is the only way to recover secure folder content after a logic board change or factory reset. Try making a call (earpiece/mic), playing music (loudspeaker), and recording voice (mic). This happens because the audio IC, like other major components, is part of the phone's power management sequence, and a fault can cause system instability. Check for continuity between the newly repaired pin and its intended connection point on the motherboard (e.g., the component it connects to). Create/Edit APN: Add a new APN or edit an existing one to match your carrier's specifications. This can happen with new SIM cards, transferred SIM cards, or even seemingly spontaneously on an existing, working SIM. Internal Disconnection: Once opened, immediately disconnect the battery connector to prevent accidental shorts. It demands unwavering caution, meticulous preparation, and strict adherence to safety protocols. Physical Condition: Check for scratches, dents, bent flex cables, uneven soldering, or poor fitment.

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