[SOLVED] I'm looking for Samsung Galaxy A52 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Samsung Galaxy A52. 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.

@Onur

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 Samsung Galaxy A52 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/809159/What+does+this+ribbon+cable+do
Take a look at comment #1490
Also, this : https://xdaforums.com/t/q-rtl-script-fix.1169466/.
You can also check this video starting from minute 6:

The Samsung Galaxy A52 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 Samsung Galaxy A52 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 Samsung Galaxy A52 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 Samsung Galaxy A52 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/652552/Screen+doesn%E2%80%99t+work+proper:+no+backlight,+with+image

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

Choose Phone Cases Wisely: While protection is important, opt for cases with good ventilation or those made of heat-dissipating materials. Plastic Opening Tools (Spudgers): Essential for prying open the phone casing and disconnecting delicate connectors without causing shorts or damage. Avoid liquid exposure: Liquid damage is a primary culprit for board-level failures, including backlight circuits. Ensure it aligns correctly with any mounting points or adhesive areas. Repeat this process several times, using a fresh piece of putty each time, until the mesh appears clear. Buff with Microfiber Cloth: Immediately use the microfiber cloth to buff the screen dry. Most smartphones with under-display sensors utilize OLED panels which are sealed with strong adhesive. Inspect the charger and cable for any signs of physical damage (frayed wires, bent pins). Check for correct voltage output from power regulators if schematics are available. Hot Air Rework Station: Once perfectly aligned, use the hot air station to heat the new port and the surrounding pads. Use a suction cup on the screen (above the home button if present, or near the bottom edge). Software Indicators: Many Android phones have built-in battery health monitors in settings. Install a reputable antivirus/anti-malware app from the Play Store (e.g., Malwarebytes, Avast Mobile Security) and run a full scan. "Original" / "Service Pack": Often used by suppliers to imply genuine parts, sometimes in official packaging. Software Updates: Ensure your OS is up to date, as manufacturers often release thermal management optimizations. Repair Damage: Repair missing components, lifted pads, or broken traces as described above. A preheater under the motherboard is highly recommended to prevent warping and aid even heat distribution. B-7000 or T-7000 adhesive (a tiny amount, if the new button requires it) or specialized button adhesive. Power Management IC (PMIC) Circuits: Closely associated with the PMIC, these coils help step up or step down voltages to supply power efficiently to different parts of the phone. While opening the phone requires careful handling due to the glued-on back cover and potentially delicate fingerprint sensor cable, the camera module itself is usually a straightforward plug-and-play component. Take note of whether the whine changes pitch or volume with different loads, as this is a strong indicator of coil whine. Performance might be sluggish, and the device might occasionally freeze or crash due to resource contention. Use a fine-tip soldering iron and solder wick (or desoldering pump) to carefully clean all the solder pads. If software and network-side troubleshooting don't resolve the issue, the problem likely lies with the smartphone's Wi-Fi hardware. Ambient Light Sensor (ALS): Detects the intensity of light in the phone's environment. The DDI receives this compressed, high-bandwidth digital data, decompresses it, and then converts it into the precise analog voltages or digital signals that individual sub-pixels (red, green, blue) on the display panel understand. Replacing a smartphone loudspeaker is generally considered an intermediate-level repair, accessible to many DIY enthusiasts with the right tools and patience. Secure Location: Keep stored parts out of reach of children and pets to prevent accidental damage or ingestion of small components. Recognizing the signs and understanding the causes empowers users to take appropriate action, whether it's a cautious DIY repair or seeking professional assistance, to prevent minor cosmetic issues from escalating into costly functional failures.Analyzing smartphone RAM corruption symptoms is crucial for diagnosing a device's instability, performance degradation, and unexpected behavior. Does it show a charging animation or battery percentage? If so, the phone's basic power input is working, and the issue might be with the power button or the boot sequence itself.

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