[SOLVED] I'm looking for Sharp Android One S7 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my Sharp Android One S7. 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.

@Pierre

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 Sharp Android One S7 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/209568/I+want+to+change+the+screan+of+iPhone6+plus
Take a look at comment #1262
Also, this : https://www.ifixit.com/Answers/View/365553/blurred+print+on+copying.
You can also check this video starting from minute 7:

The Sharp Android One S7 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 Sharp Android One S7 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 Sharp Android One S7 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 Sharp Android One S7 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/excessive-pressure-required-to-slide-contacts-cdma-touch-pro.493733/

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

If the rattling sound significantly reduces or stops, it was likely the normal OIS. Visual Inspection (Microscope): Immediately inspect the re-soldered BGA component under a high-power microscope. Isopropyl Alcohol (IPA - 90%+ pure): Essential for cleaning old adhesive residue from frames and components, and for cleaning corrosion from water-damaged boards. Schottky Diodes: These are a type of rectifier diode known for their low forward voltage drop and fast switching speed. You'll need a way to display uniform, solid colors across the entire screen. The inverted noise essentially cancels out the actual noise in the primary signal, leaving a clearer voice track. If tripped (usually turn red), it confirms liquid exposure, making oxidation more likely. Next, focus on the smartphone's software configuration for dual-SIM management: Use a plastic spudger or your finger to ensure it makes full contact along its entire length. Antennas: Disconnect and remove any internal antenna modules or wires. Heat Gun or Heating Pad: Necessary if the screen or back panel is secured with adhesive. Gently press around the edges to secure it, possibly using new adhesive strips if the original ones were destroyed. Watch a Video Guide: Before you begin, search for a repair video specific to your phone model on platforms like YouTube or iFixit. Unusual Creaking or Rattling: When gently shaking or pressing on the phone, if you hear unusual creaking, popping, or rattling sounds, it might be the internal frame components shifting or broken pieces moving within the chassis. This will show you the exact opening procedure, screw locations, and how to access the speaker unit. If one or both still have issues, the SIM cards themselves are suspect. The risks associated with a liquid-damaged battery are far greater than a simply dead or old battery, making its safe removal an absolute priority for preventing further damage to the phone and ensuring personal safety. In conclusion, analyzing smartphone face unlock failures requires a comprehensive approach that systematically eliminates environmental, user-related, and software factors before pointing to a hardware issue. You must download the correct stock firmware for your phone's exact model number (e.g., SM-G998U, A205FN, etc.) and region/carrier. Never lift a component completely off the phone using only the suction cup without first disconnecting its flex cables. Ensure it matches your specific phone model precisely, as different regions or carriers sometimes use slightly different components. An interruption due to power loss during the reset process can potentially corrupt system files, leading to a soft brick. Thermal Pads/Areas: Components that generate significant heat (e.g., SoC, PMIC) often rely on thermal pads and the board itself for heat dissipation. By meticulously following these instructions, you can restore full functionality to your device, ensuring you maintain complete control over your smartphone's audio experience and essential button-driven features.## 10. Factory Reset/Firmware Flash: As a last resort, these can rule out severe software corruption. Beyond visual cues, functional assessment provides strong circumstantial evidence that oxidation might be the underlying problem: An intermittent fault is particularly frustrating because it doesn't manifest consistently, making diagnosis tricky. Swelling/Discoloration: Can indicate internal damage or heat exposure. No sound or distorted sound: Double-check the earpiece speaker's connection to the logic board or its flex cable. Install Drivers: If your device isn't recognized as "Qualcomm QDLoader 9008," install the drivers.

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