Wednesday, November 30, 2016

Yamaha HTR-2064 – Firmware update procedure – Initialization – Self diagnostics – Protection modes and causes

UPDATING FIRMWARE
Confirmation of firmware version and checksum
Before and after updating the firmware, check the firmware version and checksum by using the self-diagnostic function menu.
Start up the self-diagnostic function and select “25. ROM VER/SUM/PORT” menu.
Using the sub-menu, have the firmware version and checksum displayed, and note them down.
When the firmware version is different from written one after updating, perform the updating procedure from the beginning again
Initializing the back-up IC (EEPROM: IC222 on DIGITAL P.C.B.)
After updating the firmware, the back-up IC MUST be initialized by the following procedure to store the setting information (soundfield parameters, system memory and tuner presetting, etc.) properly.
Start up the self-diagnostic function and select “24. FACTORY PRESET” menu. (For details, refer to “SELF-DIAGNOSTIC FUNCTION”) 
Select “24. PRESET RSRV”, press the “ ” (Power) key to turn off the power once and turn on the power again. Then the back-up IC is initialized. 
Connection
Connect a CD/DVD/BD player to this unit as shown below.

Operation Procedures
1. While pressing the “INFO” key, connect the power cable to the AC outlet.
The FIRMWARE UPDATE mode is activated and “CDDA Upgrader” is displayed.
2. Play the firmware CD on the CD/DVD/BD player. Writing of the firmware starts automatically.
3. When writing of the firmware is completed, “Update Success”, “Please...” and “Power off!!” are displayed repeatedly.
If the display remains unchanged for more than 10 seconds after starting the firmware CD play procedure, perform the firmware CD play procedure again from the beginning.
If “FILE CORRUPTED” is displayed after “Address:XXXXXX”, make sure that the data written to the firmware CD is not corrupted and perform Steps 1 to 3 of “Operation Procedures” again.
If “Upgrade Failed” is displayed, perform “operation procedures” from the beginning again.
4. Press the (Power) key to turn off the power.
5. Eject the firmware CD from the CD/DVD/BD player.
6. Start up the self-diagnostic function and check that the firmware version and checksum are the same as written ones. 
Starting Self-Diagnostic Function
While pressing the “TONE CONTROL” and “STRAIGHT” keys, press the “ ” (Power) key to turn on the power.
The self-diagnostic function mode is activated.
Starting Self-Diagnostic Function in the protection cancel mode
If the protection function works and causes hindrance to troubleshooting, cancel the protection function by the procedure below, and it will be possible to enter the self-diagnostic function mode.
(The protection functions other than the excess current detect function will be disabled.)
While pressing the “TONE CONTROL” and “STRAIGHT” keys, press the (Power) key to turn on the power and keep pressing those 2 keys and the “ ” (Power) key for 3 seconds or longer.
The self-diagnostic function mode is activated with the protection functions disabled.
In this mode, the “SLEEP” segment of the FL display flashes to indicate that the mode is self-diagnostic function mode with the protection functions disabled.
Canceling Self-Diagnostic Function
1. Before canceling self-diagnostic function, execute setting for FACTORY PRESET of main menu No.24. (Memory initialization inhibited or Memory initialized).
In order to keep the user memory preserved, be sure to select PRESET INHIBITED (Memory initialization inhibited).
2. Press the (Power) key to turn off the power.
Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation when the power to this unit is turned off.
1. When the power is turned off by usual operation:
“NO PROTECT” is displayed. Then “1. ANALOG BYPAS” is displayed in a few seconds.
2. When the protection function worked to turn off the power:
The information of protection function which worked at that time is displayed. Then “1.ANALOG BYPAS” is displayed in a few seconds.
Note: At that time if you restart the self-diagnostic function after turning off the power once, “NO PROTECT” will be displayed. That is because that situation is equal to “1. When the power is turned off by usual operation:”.
When the protection function worked due to excess current.
Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power amplifier is detected, the abnormal channel can be identified by checking the current detect transistor.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.
When the protection function worked due to a short between speaker terminals.
Cause: The line between speaker terminals is shorted.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted speaker terminal and the connected speaker can be identified.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.
When the protection function worked due to abnormal DC output.
Cause: DC output of the power amplifier is abnormal.
Supplementary information: The protection function worked due to a DC voltage appearing at the speaker terminal. A cause could be a defect in the amplifier.
Turning on the power without correcting the abnormality will cause the protection function to work in 3 seconds and the power supply will be shut off.
When the protection function worked due to abnormal voltage in the power supply section.
Cause: The voltage in the power supply section is abnormal.
Supplementary information: The protection function worked due to a defect or overload in the power supply.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 seconds and the power supply will be shut off.
When the protection function worked due to excessive heatsink temperature.
Cause: The temperature of the heatsink is excessive.
Supplementary information: The protection function worked due to the temperature limit being exceeded.
Causes could be poor ventilation or a defect related to the thermal sensor.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 seconds and the power supply will be shut off.
For detection of each protection function, refer to main menu described later.

One for all OARH02B - 2-Device Universal Remote – Code List for television – How to program the Remote


Auto Code Search
The Auto Code Search goes automatically through all the codes for the device you’re trying to control. When you find the one that operates your device, you can stop the search and store that code.
1. Manually turn on the component you want to program the remote to operate.
2. Press and hold the CODE SEARCH key until the indicator light turns on.
3. Press the component key you want to program-TV or SAT·CBL·DTC. The indicator light blinks once and remains lit.
Important: Find the ENTER key on your remote (don’t press it yet). You will need to press this key quickly in step 5 below
4. Point the remote directly at the front panel of the device you want to control. Press the POWER key and wait for the indicator light to blink. Each time the indicator light blinks, the remote is testing a code with the device. Make sure you keep the remote pointed at the device you want to operate.
5. As soon as the component turns off, press the ENTER key within 4 seconds.
Note: If you wait longer than 4 seconds to press ENTER, the remote goes to the next code you will need to start the code search from step 1 again.
The indicator light flashes 8 times and turns off when the remote has searched all the codes. If this happens, try one of the other programming methods.
6. Test the remote with your component to make sure you can control most of the device’s functions. If some features don’t work, try the Direct Code Entry method.
Direct Code Entry
Direct Code Entry lets you enter a code from the code list at the end of this manual for your brand of device. It’s not as easy as the other methods, but it’s potentially the fastest method.
1. Manually turn on the component you want to program the remote to operate.
2. Find the four-digit code for your brand of TV, satellite receiver, cable box, or digital TV converter in the code list at the end of this manual.
3. Press and hold the CODE SEARCH key until the indicator light turns on.
4. Press the component key you want to program TV or SAT·CBL·DTC. The indicator light blinks and then remains lit.
Note: “DTC” stands for Digital TV Converter.
5. Enter the four-digit code, using the numeric keypad. After the code is entered, the indicator light turns off.
Note: If the indicator light blinks multiple times, you’ve entered an invalid code. Start from step 2 again.
6. Aim the remote at the component and press the POWER key. If the component turns off: The remote is programmed to operate this component.
If the component does NOT turn off: Try the next code for your brand.
Note: If no codes work, or if your brand is not listed, try the Auto Code Search or Manual Code Search.
Manual Code Search
The Manual Code Search lets you go one-by-one through all the codes for the device you’re trying to control. When you find the one that operates your device, you can stop the search and store that code.
1. Manually turn on the component you want to program the remote to operate.
2. Press and hold the CODE SEARCH key until the indicator light turns on.
3. Press the component key you want to program TV or SAT·CBL·DTC. The indicator light blinks once and remains lit.
Important: Find the ENTER key on your remote (don’t press it yet). You will need to press this key quickly in step 5 below.
5. As soon as the component turns off, press the
ENTER key within 4 seconds.
Note: If you wait longer than 4 seconds to press ENTER, the remote goes to the next code you will need to start the code search from step 1 again.
4. Point the remote directly at the front panel of the device you want to control. Press the POWER key once every 2-3 seconds until your component turns off.
Note: Since this remote has hundreds of codes, you may have to press the POWER key many (perhaps hundreds of) times using this method.
The indicator light flashes 8 times and turns off when the remote has searched all the codes. If this happens, try one of the other programming methods.
6. Test the remote with your component to make sure you can control most of the device’s functions. If some features don’t work, try the Direct Code Entry method.
Code List for Television
A
Admiral  0093, 0463
Advent  0761
Akai  0812, 1675, 0702, 1935
AOC  1365, 1589, 2014, 2087, 2479
Apex Digital  0748, 0765, 1217, 2397
Audiovox  0451, 0802, 1766,1769, 1868, 2121
Aventura  0171
B
Broksonic  0463, 1935
C
Carver  0054
Celebrity  0001
Celera 0765
Changhong  0765
Citizen  0060, 1935
Coby  1634, 2306, 2315, 2344, 2345, 2348
Commercial Solutions  1447, 0000
Crosley  0001, 0054
Curtis 2352, 2466
Curtis Mathes  0000, 0054, 0451, 0093,0060, 0702, 0145, 1661
D
Daewoo  0451, 1661
Dell  1264
Denon  0145
Dumont  0017
Durabrand  0463, 0178, 0171
Dynex  1463, 2049, 2184
E
Electroband  0001
Electrograph  1755
Electrohome  0463, 1670
Element  1687, 1886, 2183
Emerson  1864, 0451, 0463, 0178,0171, 1661, 1394, 1665, 1963
Emprex  1422
Envision  1365, 1589, 2014, 2087
ESA  0812, 0171, 1963
F
Funai  0001, 0171, 1963
G
Gateway  1755
GE  1547, 1447, 0000, 0051, 0451, 0178
GFM  0171, 1665, 1963, 2167
Gibralter  0017
GoldStar  0178
H
Haier  1748, 1749, 2309
Hallmark  0178
Hannspree  1348
Harman/Kardon  0054
Havermy  0093
Hello Kitty  0451
Hisense  0748, 1660, 2098, 2355
Hitachi  1643, 0145
I
iLo  1394, 1665, 1684
Infi nity  0054
Insignia  1423, 1564, 0463, 0171,1660, 1710, 1892, 1963, 2049
Inteq  0017
J
JBL  0054
JCB  0001
Jensen  0761
JVC  0463, 0053, 1253, 1601, 1774, 2264
K
KDS  1498, 1687
KLH  0765
L
LG  1423, 1447, 0017, 0178, 2358, 2424
LXI  0000, 0054, 0156, 0178
M
MAG 1498, 1687
Magnavox 1454, 1866, 1755, 0054, 0051, 0171, 0802, 1365, 1856, 1963, 2372
Marantz  1454, 0054
Matsushita  0250
Maxent  1755
MB Quart 1868
Megatron  0178, 0145
Memorex  0463, 0150, 0178, 1670, 1892
MGA 0150, 0178
Midland  0000, 0017, 0051
Mitsubishi  1250, 0093, 0150, 0178
Motorola  0093
MTC  0060
N
NAD  0156, 0178
NEC  1797
NetTV  1755
Nexus Electronics  2183
Nikko  0178
Norcent  0748, 1365, 1589
O
Olevia  1610, 1240, 1331
Optimus  0250
Optoma  1348
Optonica  0093
Orion  0463, 1463
P
Panasonic  1480, 0250, 1457,0051, 1291, 2264
PARK 2104, 2194
Penney  0000, 0156, 0051, 0060, 0178
Petters 1523
Philco  0054, 0171, 1394, 1665, 1963
Philips 1454, 1866, 0054, 1744,1856, 2372, 2374
Pioneer  1457
Polaroid  1523, 0765, 1276, 1498,1687, 1766, 1769, 2121
Portland 0451, 1661
Prima 0761
Prism  0051
Proscan  1447, 0000, 2256
Proton  0178
Proview  1498, 1687
Pulsar  0017
Q
Quasar  0250, 0051
R
RadioShack  0000, 0178
RCA  1547, 1447, 0000, 0051, 0093,1661, 1781, 2187, 2247, 2434
Realistic  0178
Runco  0017
S
Sampo  1755
Samsung  0812, 0060, 0702,0178, 1060, 2051
Sansui  0463, 0171, 1670, 1892, 1935
Sanyo  0054, 1142
Sceptre  0878, 1217, 1360, 1599, 2506
Scotch 0178
Scott  0178, 1711
Sears  0000, 0054, 0156, 0178, 0171
Sharp  0818, 0093
Sheng Chia 0093
Signature  0054
Sony  0810, 0001
Soundesign  0178
Soyo 1826
Spectroniq  1498, 1687
Squareview 0171
Superscan  0093
Supreme  0001
SVA  0748, 1963
Sylvania  1864, 0054, 0171,1394, 1665, 1886, 1963
Symphonic  0171
Syntax  1610, 1240, 1331
T
Tandy  0093
Technics  0250, 0051
Techwood 0051
Teknika  0054, 0150, 0060
Telefunken  0702
TMK  0178
TNCi  0017
Toshiba1524, 0156, 0060, 1291, 1935, 2006
TVS  0463
V
Victor  0053
Vidikron  0054
Vidtech  0178
Viewsonic  1755, 0885, 1330, 1365, 1578, 1627, 1640, 1742, 2014, 2087, 2277
Viore  1684, 2104, 2352
Vizio  1758, 0885
W
Wards  0001, 0000, 0054, 0017, 0156, 0051, 0060, 0178
Waycon  0156
Westinghouse 1712, 0451, 0885, 1217
White Westinghouse  0463, 1661
Wyse  1365
Z
Zenith  0001, 1423, 0000, 0017, 0463, 0178, 0145, 1661, 1365

Tuesday, November 29, 2016

Sony intelligent Android 4K HD LED TV - KDL-40W580B - KDL-48W580B - KDL-60W600B – How to access Service mode – How to enter to self diagnostics – Service mode adjustments – Panel time reset – VCOM adjustment


Accessing Service Mode
1) Go to TV standby condition by remote commander.
2) Press “i+ (info)”, “5”, “Volume +” then “TV power” on remote.
3) You can see Service Mode on display.
The above operation should be finished within 15 seconds after the set go to STBY mode
Transition of Each Micro’s Service Mode
OPTIONS
1. First of all, when you enter Service Mode, you can see “Digital” service mode.
2. Whenever you press “OPTIONS” on remote, service mode is changed according to the flow below:
Change Data by Service Mode 1 (Part A)
1. Change Data of “Chassis” or “VPC” service mode
a. Press “2 / 5” on remote to select (up / down) category.
b. Press “1 / 4” on remote to select (up / down) Item.
c. Press “3 / 6” on remote to change (up / down) data.
Save Changing Data by Service Mode 1
2. Write data for “Chassis” or “VPC” service mode.
a. Press “Mute” on remote. It shows green “SERVICE” changes to green “WRITE”.
b. Press “0” on remote. Green “WRITE” changes to red “WRITE”. It indicate writing is processing.
c. After a while, red “WRITE” changes to green “SERVICE”. Writing process is done at this point.
3. TV reboot is necessary for applying data change.
Change Data by Service Mode 2 (Part B)
1. Change Data of “Digital” service mode (except “003 DIG_SRV_MODE” category)
a. Press “2 / 5” on remote to select (up / down) category.
b. Press “1 / 4” on remote to select (up / down) Item.
c. Press “3 / 6” on remote to change (up / down) data,
“Digital” service mode don’t have to Save. (except “002 MODEL”)
2. Change Data of “Digital” service mode ( “003 DIG_SRV_MODE” category). “003 DIG_SRV_MODE” is one category of “Digital” service mode. Please note because this operation is special.
a. Press “2 / 5” on remote to select “003 DIG_SRV_MODE”.
b. Press “1 / 4” on remote to select (up / down) Item.
c. Press “0 / 10” on remote to select item.
d. Press number key “1”~”9” directly. “*” stamp move.
e. Press “12 / enter / select” to decide and advance to the next step. Press “return”, to return to the previous page.
Checking Board Information
1. In “Digital” service mode ( “002 MODEL” category)
2. Press “0 / 10” on remote to select item.
3. Press “1” on Remote.
Note : Check the Result. Result 1 : NG ,
Result 2: OK, Result 3 : OK (With “TUNER BOARD OPTION is changed correctly”) comment
4. Press “Return” on Remote
5. Press “2” on Remote.
6. Press “Return” on Remote.
Save Changing Data by Service Mode 2
1. In “Digital” service mode ( “002 MODEL” category)
001 SEG Select segment information
002 DEST Select destination information
003 MODELNAME Select Model Name
004 SERIAL Can be set Only Once for the new board
005 SHIP_CONFIRM...Can set correct Product Code
006 VAR_TYPE Select variable information
a. Change data for each model. (Refer to 4-4 Part B)
b. Press “Mute”, “0” on remote sequentially. Red “
WRITE” is shown. This indicates writing is in process.
c. After a while, red “
WRITE” disappears. Green Done will be displayed for a while, which means writing process is done.
d. For the items SEG, DEST, MODELNAME after changing each item, service save (“mute”+”0”) is required. For the item SERIAL, after inputting the serial number, press key “12” or “Enter” to save the data.
– Please save the items according to the sequence “SEG -> DEST -> MODELNAME-> VAR_TYPE”
– When Saving the item "SEG", sometimes instead of "Writing", the word "Pending" will appear. In this case, skip "SEG", saving "DEST“ , "MODELNAME“ and “VAR_TYPE” is OK.
Restore WB / Gamma Adj. Data to B board.
1.in “VPC” service mode
a.Select “000 DATA_COPY” category by pressing “2 / 5” on remote.
b.Change data from “0” to “1” by pressing “3 / 6” on remote.
c.Wait until data is changed from 1 to 3.
d.When data is changed from 1 to 3, restoring process is finished.
e.In case data is changed from 1 to 2, keep default setting. (No more process is needed.)
WB Adjustment by Service Mode
1. in “VPC” service mode (“004 WB” category)
a. Press “1” or “4” on remote to select WB adjustment menu.
b. Change data by pressing “3” or “6”. Each range of these items is 0~1023.
c. Press “mute”
”0” on remote to save the data. “SERVICE” comment is changed to “WRITE”, indicating writing process.
d. After a while, “WRITE” comment returns to “SERVICE”, which means writing process is done. (takes about a couple of seconds)
VCOM Adjustment (NFR-AUO/SDC/FXC Panel)
STEP1
1. in “Digital” service mode
a. Select “003 DIG_SRV_MODE” category by pressing “2 / 5” on remote.
b. Press “0” to go to “TEST PATTERN” Mode.
c. Press “Enter” or “12” to go into Video TEST PATTERN.
d. Press “7” or “8” to select the test pattern
e. Press “Enter” or “12” twice to show the VCOM TEST PATTERN.
STEP2
2.in “VPC” service mode a. Select “002 VCOM” category by pressing “2 / 5” on remote.
b. Select “000 ENABLE” item by pressing “1 / 4” on remote.
c. Change ENABLE from “0” to “1” by pressing “3” to enable VCOM adjustment.
STEP3
3. in “VPC” service mode
a. Select “002 VCOM” category by pressing “2 / 5” on remote.
b. Select “001 ADJUST” item by pressing “1 / 4” on remote.
c. Change data by pressing “3 / 6” on remote.
STEP4
4. in “Digital” service mode
a. Select “007 VCOM” category by pressing “2 / 5” on remote.
b. Change data from “1” to “0” by pressing “3 or 6 ” on remote.
c. Confirm the final result of the VCOM adjustment .
d. If OK, Finish the VCOM adjustment. If NG, pressing “3 or 6” to show the OSD again and go back to VCOM adjustment Step 3.
VCOM Adjustment (HFR-AUO/FXC Panel)
STEP1
1. in “VPC” service mode
a. Select “002 VCOM” category by pressing “2 / 5” on remote.
b. Select “000 ENABLE” item by pressing “1 / 4” on remote..
c. Change ENABLE from “0” to “1” by pressing “3” to enable VCOM adjustment.
-The Picture is change Vcom Pattern and you can’t see OSD
STEP2
2. in “VPC” service mode (There is no OSD.)
a. Select “002 VCOM” category by pressing “2 / 5” on remote.
b. Select “001 ADJUST” item by pressing “1 / 4” on remote.
c. Change data by pressing “3 / 6” on remote.
d. Finish the adjustment when the picture seems OK.
e. Select “000 ENABLE” item by pressing “1 / 4” on remote.
f. Change ENABLE from “1” to “0” by pressing “6” to disable VCOM adjustment. and you can see OSD.
1. in “Digital” service mode
a.Select “003 DIG_SRV_MODE” category by pressing “2 / 5” on remote.
b. Select “006 REC_SETTING ” item by pressing “1 / 4” on remote.
c. Press “0” or “10” to go to detailed REC Setting screen.
STEP2
2. in detailed REC setting screen
a. Press “1” to select “Key Copy” item
b. Press “Enter” or “12” twice to execute the command.
c. If OK, show the message “Key Copy OK”. If NG, show the message “Key Copy NG (= xx )”.
d. Press “Return” to return to previous page.
STEP3
3. in detailed REC setting screen
a. Press “2” to select “HDD Re-Register” Item.
b. Press “Enter” or “12” twice to execute the command.
c. If OK, xx= x+1. If NG, xx=x.
d. Press “Return” to return to previous page.
Reset Panel Operation Time
1. In Self Diagnosis Display (refer to How to Enter Self Diagnosis Display)
a. Reset Panel Operation Time <7> -> <0>
Set to Shipping Condition
1. How to do shipping condition.
a. Move to “Digital” service mode.
b. Press “8” on remote. It shows green “SERVICE” changes to green “RST-”.
c. Press “mute” on remote. Added green “EXE” after green “RST-” .
d. Press “0” on remote. Green “EXE-RST” changes to red “EXERST”. It indicate writing is processing.
e. After a while, red “EXE-RST” changes to green “SERVICE”.
f. And blink Smart Core WHITE LED. Writing process is done at this point.
<Another way>
You can set to shipping condition w/o entering Service Mode. -> “Cursor Up” + “Power Key” on remote.
How to Enter Self Diagnosis Display
1. Go to TV standby condition by remote commander.
2. Press “i+ (info)”, “5”, “Volume-” then “TV power” on remote.
3. You can see Self Diagnosis Display.
4. To Exit , Press Power Off and On.


Monday, November 28, 2016

Leapfrog LeapPad 3 – Disassembling procedure – How to replace the display


Before taking apart your device, ensure that it is turned off and that your anti-static wrist strap is secured to a ground.
Remove the six 10.0 mm Phillips #0 screws from the outer case and remove the cover with your hands.
You will not need to pry the case off.
Unplug the battery from the motherboard with your hands.
The battery sits to the right of the motherboard.
Pry the battery gently off of the plastic platform with an opening tool.
Do not to puncture the battery, as the material inside can be dangerous.
Disconnect the audio cord from the motherboard using a plastic opening tool.
When re-plugging this cord be sure it is flush with the slot, otherwise the speaker and directional pad will malfunction.
Use caution when unplugging, and re-plugging the ribbon cord as they are fragile.
Unscrew the five 6.0 mm phillips head screws from the board containing the audio jack and directional pad.
Unscrew the three 6.5 mm phillips head screws holding down the speaker to the right of the audio jack.
Remove the board and speaker from the device.
Unplug the front facing camera cord with an opening tool to free the top of the motherboard.
Remove the three 6 mm phillips head screws holding the motherboard to the display assembly.
Carefully lift the motherboard out of the case, exposing the last remaining cord on the underside of the motherboard.
Disconnect the gold display assembly cord with an opening tool to fully disconnect the
motherboard.
The device was rotated 180 degrees in order to unplug the display assembly cord.
Unscrew the eight 6.5mm Phillips #0 screws from the plastic casing.
Remove the covering with your hands to allow full view of the display assembly.
Remove the display assembly from the black rubber sleeve carefully.
There is a specific orientation for the rubber sleeve so take note of its position.

Lenovo YOGA 910 – Disassembling – How to check the AC adapter – How to check and remove battery pack

Checking the AC adapter
You are here because the computer fails only when the AC adapter is used.
If the power-on indicator does not turn on, check the power cord of the AC adapter for correct continuity and installation.
If the computer does not charge during operation, go to “Checking operational charging”.
To check the AC adapter, follow the steps below:
1. Unplug the AC adapter cable from the computer.
2. Measure the output voltage at the plug of the AC adapter cable. See the following fgure:
Note: Output voltage for the AC adapter pin No. 2 may differ from the one you are servicing.
3. If the voltage is not correct, replace the AC adapter.
4. If the voltage is acceptable, do the following:
Replace the system board.
Note: Noise from the AC adapter does not always indicate a defect
Checking operational charging
To check whether the battery charges properly during operation, use a discharged battery pack or a battery pack that has less than 50% of the total power remaining when installed in the computer.
Perform operational charging. If the battery status indicator or icon is not lit, remove the battery pack and let it return to room temperature. Reinstall the battery pack. If the charge indicator or icon is still off, replace the battery pack.
If the charge indicator is still not lit, replace the system board.
Checking the battery pack
Battery charging does not start until the Power Meter shows that less than 95% of the total power remains; under this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or from having a shortened life.
To check your battery, move your cursor to the Power Meter icon in the icon tray of the Windows taskbar and wait for a moment (but do not click it), and the percentage of battery power remaining is displayed. To get detailed information about the battery, double-click the Power Meter icon.
Note: If the battery pack becomes hot, it may not be able to be charged. Remove it from the computer and leave it at room temperature for a while. After it cools down, reinstall and recharge it.
Restore of factory default
The Lenovo YOGA 910-13IKB/Lenovo YOGA 910-13IKB Glass computer comes with pre-installed OneKey Recovery System.In order to save application files and the initial backed up files of the system, the hard disk in a Lenovo computer includes a hidden partition when it is shipped. If you need to restore the system to the point of your first boot up, just enter Lenovo OneKey
DISASSEMBLING PROCEDURE 
Base cover
Remove the screws 1. Then remove the base cover 2
Battery pack
Peel off the adhesive tape that secures the battery connector 1.
Release the two latches on both edges of the socket at the same time in the directions shown by arrows 2, and then unplug the battery connector in the direction shown by arrow 3. Remove the screws 4, then remove the battery pack 5.

Apple iPad Wi-Fi – How to replace the Speakers


If your display glass is cracked, keep further breakage contained and prevent bodily harm during  your repair by taping the glass.
Lay overlapping strips of clear packing tape over the iPad's display until the whole face is covered.
This will keep glass shards contained and provide structural integrity when prying and lifting the display.
Do  your best to follow the rest of the guide as described. However, once the glass is broken, it will likely continue to crack as you work, and you may need to use a metal prying tool to scoop the glass out.
Wear safety glasses to protect your eyes, and be careful not to damage the LCD screen.
Insert a metal spudger between the top edge of the display assembly and the rear panel assembly.
Rotate the spudger away from you to release the tabs along the top edge of the display.
Insert a second metal spudger between the top edge of the display assembly and the rear panel assembly to keep the tabs from snapping back into place.
With one spudger, work your way along the right edge of the iPad.
The front panel is held to the aluminum back by metal clips on the top, bottom, and left sides. The right side has plastic tabs which slide into recesses in the backplate.
Once the clips are released, lift the left side of the front panel up and slide it to the left to clear the tabs from the aluminum backplate.
Lift the display assembly away from the rear panel assembly by its bottom edge.
Do not attempt to remove the display at this time, as it is attached to the rear panel assembly.
In the following steps, you will disconnect the three cables attaching the display assembly to the logic board. The cables are for the following components:
Digitizer
Ambient Light Sensor
Display Data Cable
Use the edge of a plastic opening tool to flip up the retaining flaps holding the digitizer ribbon cables in their sockets on the logic board.
Be sure you are flipping up the retaining flap, not the socket itself.
Pull the digitizer ribbon cables straight out of their sockets.
Use a plastic opening tool to remove the ambient light sensor connector from its socket by gently prying upward.
Disconnect the display data cable from the main board by flipping up the metal retainer by its black plastic pull tab.
Pull the cable connector away from its socket.
Pull the connector parallel to the face of the logic board.
Remove the display assembly from the rear panel assembly.
Remove the two 4.56 mm T5 Torx screws securing the dock connector cable to the main board.
Remove the single 2.84 mm T5 Torx screw connecting the dock connector cable to the rear case assembly.
Remove the two 2.84 mm T5 Torx screws securing the dock connector cable to the rear panel assembly.
Carefully remove the plastic cover over the WiFi/Bluetooth board and dock connector cable using a plastic opening tool.
Pry the Wi-Fi and Bluetooth antennas up off their respective sockets on the Wi-Fi/Bluetooth board.
Remove the dock connector cable from the rear panel assembly.
Use the edge of a plastic opening tool to disconnect the speaker connector from the logic board. Pry up from beneath the wires.
Remove the two 2.84 mm T5 Torx screws securing the speaker assembly to the rear panel assembly. If necessary, remove the tape covering the Wi-Fi cables.
De-route the Wi-Fi antenna through its channel in the speaker assembly.
Deroute the speaker cable connector through the left side of the rear panel assembly.
Lift the speaker assembly and push it forward until the ports clear the bottom side of the rear panel assembly.
Remove the speaker assembly out of the rear panel assembly.