[SOLVED] I'm looking for Sony ericsson K810 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Sony ericsson K810. 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.

@Lily

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 ericsson K810 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/q-anyone-able-to-port-the-new-htc-weather-and-clock-apks-over-to-miui.1241124/
Take a look at comment #1268
Also, this : https://www.ifixit.com/Answers/View/884458/Replacing+power+and+audio+cable+and+reattaching+logo.
You can also check this video starting from minute 6:

The Sony ericsson K810 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 ericsson K810 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 ericsson K810 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 ericsson K810 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/510234/Touch+Screen+Not+Working,+not+touch+disease

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

Flex Cable Damage: The ambient light sensor is rarely a standalone component. Manufacturing Defects: Less common, but sometimes a faulty chip can be present from the factory. Far from being benign garbage, discarded smartphones and their components contain a cocktail of hazardous materials that pose severe risks to human health and the environment if not disposed of properly. Identifying these hidden drains is crucial for optimizing battery life and maintaining smartphone performance. If the resistor is burnt, damaged, or missing, the multimeter will likely show "OL" (Open Line/Infinite Resistance). As display technology continues to evolve, the push for flicker-free OLEDs remains an important consideration for manufacturers and consumers alike.The expectation for a modern smartphone is seamless, fluid operation. The flashlight system comprises several key components: the LED emitter(s) themselves, a dedicated LED driver IC (Integrated Circuit) that controls power delivery and brightness, and often a power management IC (PMIC) that orchestrates overall power distribution. Impact Damage: A drop can dislodge internal components within the camera module, damage the OIS/AF mechanism, or even break internal connections. Heat Gun or Hot Air Rework Station: Essential for heating adhesive on screen assemblies or for desoldering if the port is soldered. Connector Points: The points where the flex cable terminates into connectors (ZIF/Zero Insertion Force, FPC/Flexible Printed Circuit) are delicate and easily damaged by improper insertion or removal. By taking your time, using the correct tools, and exercising caution, you can successfully perform this repair yourself and avoid potentially costly professional repairs.## 4. Modern smartphones often integrate a Hall effect sensor to intelligently manage the screen's state in conjunction with magnetic flip covers. By carefully following the steps, using the right tools, and exercising patience, you can successfully restore your smartphone's vital expandable storage capabilities, making your device more versatile and user-friendly.## 10. If it's a separate module, gently peel it away from its adhered surface. Learning to read schematics is a significant investment of time, but it transforms smartphone repair from a component swapping lottery into a precise, diagnostic science. Hot Air Rework Station: Essential for desoldering and re-soldering soldered shields. Solder Bridges: Especially with fine-pitch ICs, solder can flow between adjacent pins, creating a short circuit. New Power Button Flex Cable (Less Common): If the power button is faulty. Research Your Specific Model: Search for a detailed teardown guide or video for your exact phone model (e.g., "iFixit iPhone 11 Power Button Replacement" or "Samsung Galaxy S20 Power Flex Replacement YouTube"). Misalignment can cause the screen to rotate incorrectly or step counts to be inaccurate. Android: Boot your phone into Safe Mode (procedure varies by device, usually involves holding volume down during boot). FPC (Flexible Printed Circuit) Connector Replacement: These small, plastic-bodied connectors are highly susceptible to melting or deformation under high heat. It manages the communication protocol, modulates and demodulates signals, processes data, and interfaces with the smartphone's main processor (SoC). It offers insights into deep sleep, current, temperature, and estimated capacity. Board Repair: If a short circuit on the PCB is the cause, it needs to be located and removed (e.g., replacing the shorted component, repairing a damaged trace). Ensure these are securely snapped into their connectors on the board and not pinched or frayed. The Process of Rebuilding a Damaged Corner of a Smartphone Logic Board The exact method for replacing a plastic volume button varies significantly based on the phone's design. Disconnect Connectors: If the flex cable has any ZIF connectors on the motherboard or a daughterboard, carefully flip up the retaining flap with a plastic spudger, then gently pull the flex cable out. These algorithms learn user habits and can slow down charging (e.g., overnight) or pause it at a certain percentage (e.g., 80%) to reduce battery degradation.

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