[SOLVED] I'm looking for CONCORD E97 repair guide or schematics (free) - Phones & Tablets Forum

Hi,

I'm hoping you can help me out with my CONCORD E97. 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.

@Evan

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 CONCORD E97 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/Guide/Pioneer+A1+XW-SMA1-K+Speaker+Replacement/122120
Take a look at comment #1619
Also, this : https://www.ifixit.com/Guide/Holmes+Blizzard+Electric+Fan+Adjustment+Knob+Replacement/185036.
You can also check this video starting from minute 6:

The CONCORD E97 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 CONCORD E97 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 CONCORD E97 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 CONCORD E97 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/469005/How+much+will+it+cost+to+clean+a+cockroach+ps4

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

They are typically protected by a thin layer of specialized glass (like sapphire or Gorilla Glass) and coated with multiple layers of chemical treatments. Carefully and evenly apply a continuous, thin bead of B-7000 (or equivalent) adhesive around the entire perimeter of the smartphone frame's bonding surface. Router Placement: Ensure the router is centrally located and not obstructed by dense materials. Re-enroll All Fingerprints: Even if previous fingerprints appeared to work, it's best practice to delete all old fingerprints and enroll them anew after a successful calibration to ensure optimal performance with the new display. Step-by-Step Replacement Process (General Guide - Device-Specific Variations): Removing Adhesive Residue: Stubborn adhesive left after removing batteries, screens, or covers can be softened and cleaned with IPA. Broken Plastic/Metal Tabs/Clips: Internal plastic clips or metal tabs designed to secure components can break off, leaving fragments to rattle, or allowing the component they were supposed to secure to move freely. If a new display still exhibits the same issues, the focus shifts to the motherboard and potentially the display driver IC. App Symptoms: Wi-Fi or Bluetooth won't turn on, constant searching for networks, inability to connect to known networks, weak signal strength despite proximity to router, GPS unable to get a location fix or showing inaccurate location (e.g., in Google Maps, Waze). Avoid: Storing parts in basements, bathrooms, or other naturally humid areas. Color shift: Colors can appear slightly different from various viewing angles compared to LCDs. Rogue Applications: Certain apps might interfere with network processes. If all software and external checks fail, the problem likely lies within the phone's hardware. Analyzing whether these factory compensations are still effective is part of the process. Look for the input voltage (battery voltage), enable signals from the PMIC/CPU, and importantly, the boosted output voltage during backlight operation. The goal is merely to confirm the presence and extent of a gap, not to widen it. For most technicians, replacing the entire display assembly is the most practical and effective solution when the fault lies within the screen. Remove SIM Card Tray and Case: Clear the device of any external accessories. This can sometimes be identified through localized heating (thermal camera or IPA method). It's crucial to differentiate between DFU mode and standard Recovery Mode, as they serve different purposes: Modern smartphones are designed to be sleek and sealed, meaning opening them requires a combination of heat and careful prying. Carefully reconnect all flex cables and secure all shields and screws. In conclusion, assessing smartphone battery percentage inaccuracies requires a methodical approach that starts with user-initiated battery recalibration. When certain pixels display a static image at high brightness for extended periods, those pixels wear out faster than their neighbors. Multimeter: Use a multimeter in continuity mode to check for shorts between power rails and ground on the logic board, guided by schematics and boardviews. Fixing it typically involves deep software restoration, but sometimes points to underlying hardware failure. Water Damage: Previous water damage can corrode motor contacts, weaken adhesives, or introduce debris, leading to alignment issues or complete failure. How to Handle Screen Replacement on Smartphones with Extreme Curves (Waterfall Displays) ALWAYS disconnect the battery flex cable from the logic board first before disconnecting any other component. Apply a small amount of liquid flux around the edges of the Audio Codec IC.

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