[SOLVED] I'm looking for REELLEX TAB-07B-01 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my REELLEX TAB-07B-01. 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.

@Evelyne

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 REELLEX TAB-07B-01 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-searching-videos.1283443/
Take a look at comment #251
Also, this : https://www.ifixit.com/Answers/View/642010/How+to+overcome+128GB+limit+on+6Gen+iPod.
You can also check this video starting from minute 5:

The REELLEX TAB-07B-01 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 REELLEX TAB-07B-01 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 REELLEX TAB-07B-01 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 REELLEX TAB-07B-01 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/230380/After+battery+replacement,+phone+keeps+rebooting

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

Verify that all internal screws are replaced in their precise, original locations; using a screw of incorrect length or type in the wrong hole can cause serious "long screw damage" to the underlying logic board. Apply Flux: Apply a fresh, very thin, and even layer of high-quality liquid flux to the clean pads on the logic board. Remove Old Solder: Once the board is cool, use a fine-tip soldering iron, fresh flux, and solder wick to clean up any remaining solder residue on the pads. Poor Wetting: Gold itself doesn't wet easily with solder without the aid of flux. iOS: iTunes/Finder automatically downloads the correct firmware during a restore. Thermal Camera Inspection: If you have access to a thermal camera, connect the board to a power supply and observe heat patterns. Before completely closing the phone, attempt to power it on using the new power button. You might use clamps or place heavy books on the phone for a few hours to ensure a strong seal. Full Reassembly: Complete the reassembly process, including sealing the screen or back cover with new adhesive if needed. A Comprehensive Guide to Smartphone Display Assembly Replacement (OLED vs. Further, more severe damage: Overcurrent can now flow unchecked, potentially frying the PMIC, CPU, or other critical components. Use a plastic spudger to gently pry up the ZIF (Zero Insertion Force) connectors. If using freezing spray, the frost will melt fastest on the hot component. Liquid Ingress: Water or corrosive liquids can short out the OIS coils, corrode the delicate contacts, or seize the moving parts. U.FL Connectors: These are tiny, circular connectors where a coaxial cable snaps onto a corresponding socket on the logic board. The key characteristic that often points towards flex damage rather than a single component failure is multiple, seemingly unrelated component failures occurring simultaneously or progressively. OLED displays often use Pulse Width Modulation (PWM) to control brightness at lower levels. Visual Inspection: Under the microscope, inspect the newly formed bond. Wait a few minutes for them to fully boot up and re-establish their connection before attempting to connect your phone again. Some devices might present a bootloader menu first (often called "Fastboot Mode" or "Download Mode"). Moisture/Condensation: Look for signs of moisture, haziness, or even fungal growth inside the lens. If you are using liquid adhesive (like B7000), apply a very thin, even bead along the perimeter of the opening where the glass sits. Evaluating smartphone touchscreen multi-touch errors is therefore a vital diagnostic step for identifying hardware malfunctions, software glitches, or calibration issues that undermine this core functionality. Condition: "New," "Used (Tested Good)," "Used (Untested)," "For Parts (Damaged)." Delete unnecessary apps, large media files, and clear app caches (`Settings > Apps > [App Name] > Storage > Clear Cache`). Load the firmware files into their respective slots in Odin (AP, BL, CP, CSC). Many Android OEMs provide desktop software designed to flash stock firmware onto their devices. Most camera glass covers are secured with a strong adhesive that requires heat to loosen. Good lighting, such as a bright desk lamp, is essential, and a jeweler's loupe or a magnifying lamp (10x or 20x magnification is ideal) will allow you to see the minute details of the connector pins clearly. If not, power off the phone, disconnect the battery, and re-check all connections for the camera module.

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