Differences

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--- doc:appunti:hardware:kingelon_g9000 [2014/12/29 12:21] – [Camera] niccolo
+++ doc:appunti:hardware:kingelon_g9000 [2017/11/17 12:27] (current) – [The Android System Recovery menu] niccolo
@@ Line 14: / Line 14: @@
       * mmcblk0p7 2416640 blocks (**2.3 Gb**) mounted as **''/data''**
       * mmcblk0p8 4058112 blocks, (**3.9 Gb**) mounted as **''/storage/sdcard0''**
+  * Display: 1080 x 1920
   * Operating system: Android 4.4.2
   * Kernel: 3.4.67
@@ Line 134: / Line 135: @@
   - Power-off the phone and detach any USB cable.
-  - Keep pressed the **volume + button** while pressing the **power button**.
+  - Keep pressed the **Volume UP button** while pressing the **power button**.
   - Release the buttons, after the Welcome logo you get the broken Android icon.
   - Press the **power button once**, you get the menu.
 **WARNING!** **There is a bug** in the Recovery, buttons does not work as stated:
-  * To **navigate** the menu use only the **volume - button**
+  * To **navigate** the menu use only the **Volume Down button**
-  * To **select** the menu item use the **volume + button**
+  * To **select** the menu item use the **Volume Up button**
   * The power button does not work, it just hide/show the menu
@@ Line 460: / Line 461: @@
 The provided headset has a 3.5 mm jack with 4 poles (TRRS), but is has a **non-standard length**. I tried some other headsets, but they are not recognized: no "headset" icon in the status bar. Using a third party headset the **FM radio application does not work**, because it requires an headset plugged.
-The pinout seems to be iPhone-like: left, right, ground and mic (Tip, Ring, Ring, Sleeve), so I wired an adapter cable "4 to 3 poles" to get the audio into my car, but only the left channel is working. Someone reported that [[https://www.avforums.com/threads/star-g9000.1888308/#post-21505064|extending the length of the jack]] can solve the problem; it requires a small lathe to modify the jack.
+The pinout seems to be iPhone-like: left, right, ground and mic (Tip, Ring, Ring, Sleeve), so I wired an adapter cable "4 to 3 poles" to get the audio into my car, but only the left channel is working. To change the audio routing I used the [[https://play.google.com/store/apps/details?id=com.woodslink.android.wiredheadphoneroutingfix|SoundAbout]] app by David Woods.
+Someone reported that [[https://www.avforums.com/threads/star-g9000.1888308/#post-21505064|extending the length of the jack]] can solve the problem; it requires a small lathe to modify the jack.
 ===== Networking =====
@@ Line 496: / Line 499: @@
 .200.148.163 dev ccmni0  scope link
 </code>
+===== Charging problem: disassembling the G9000 =====
+After three months of use, the phone started suffering from **charging problem**.
+Sometimes **the orange LED did not light-up** when the power adapter was plugged; sometimes a crazy loop of messages //charger plugged// - //charger unplugged// begun, which can result in phone crash. Sometimes, when the phone was plugged for the nightly charge, the orange LED turned on, but the morning after the phone was completely discharged ad the LED was off. Sometimes applying a light force to the USB connector (blending it toward the back of the phone) seemed to help, but everything was extremly unreliable.
+It was not a cable or connector problem, it turned out that the power connector required a **soldering reflow**. Fortunately only a partial disassemble of the phone was required: just removing the **back frame** you can detach the **power board**.
+{{.:g9000:g9000_dis01_screws.jpg?direct&200|}}
+{{.:g9000:g9000_dis03_back-frame.jpg?direct&200|}}
+{{.:g9000:g9000_dis05_bottom-board-screw.jpg?direct&200|}}
+Remove the 10 screws which keep the back frame. Divaricate the metal-plated frame from the screen glass using your thumb's nails. Facing the screen: the glass comes toward you and the frames goes to the back. Beware of the volume and power buttons.
+The **power board** at the bottom is secured with a single **screw**. Before removing it, detach the **antenna cable** and pull the **vibrator** out from its seat, where is secured with some adhesive.
+{{.:g9000:g9000_dis02_frame.jpg?direct&200|}}
+{{.:g9000:g9000_dis04_button.jpg?direct&200|}}
+{{.:g9000:g9000_dis06_bottom-board.jpg?direct&200|}}
+Now you can rotate the power board and see the **flat connector**. The **white piece of plastic** keeps the connector locked-in: flip it, so the connector is released.
+{{.:g9000:g9000_dis07_lock-flip.jpg?direct&200|}}
+{{.:g9000:g9000_dis08_power-connector.jpg?direct&200|}}
+Now the power board is free and you can reflow the soldering. I put very little **soldering flux** over the contacts, a bit of **tin** (a good **silver-alloy**) on the soldering iron. I used a 2 mm soldering tip, larger than the contacts, so I used very few tin for a very short time. Clean the flux with a needle, **cotton swab and alcohol**; inspect closely to avoid short-circuits.
+After some days of use, it seems that **the charging problem is solved**.
 ===== Link =====
@@ Line 504: / Line 535: @@
   * [[http://www.chinaphonearena.com/forum/Thread-Tutorial-Backup-MTK6592-MTK6589-MTK6577-and-all-MTK-Phones|Backup MTK6592 MTK6589 MTK6577 and all MTK Phones]]
   * [[http://www.chinaphonearena.com/forum/Thread-How-To-Create-new-Touch-or-nonTouch-CWM-Recovery-on-MTK-Phones|Create new Touch or nonTouch CWM Recovery on MTK Phones]]
+----
+<php>echo '<a rel="me" href="https://profiles.google.com/100662196154811835450">Profilo Google+</a>' . "\n";</php>