Thursday 20 February 2020

L37TA6A Haier LCD TV – PCB connection details, schematic and interface details


This chassis is used to match and connect the big screen LCD TV, it supports multi-system TV input signal.  it can stored 128 TV programs at most, at the same time the highest resolution of this chassis can be up to SXGA or appear R, G, B input signal of WXGA of 16:9 again, color appear again can support 24 bit, and it
can realize synchronous automatic check. It can support 1080P HD signal input at most, and includes two rows CVBS signal, one row S terminal signal input, one row HDMI signal one row CVBS signal output.
Inbuilt 2x10W medium sound + 2x3W treble sound output, four rows two channels external audio signal input, one row sound output. Support left and right sound balance, equalizer adjustment function.
Meanwhile, this chassis can support TV signal and digital display in HD signal at the same time, and there are 3A picture optimize, 3A demo.
This chassis use new HYF-35R remote controller (grey, 41 button, can not share with the original blue 35 button HYF-35R ), the method to enter the factory mode is: Screen-----P.STD------S.STD------Sleep Time.
The following is the instructions of the factory menu of V2.1 version program.
The sound box part and the structure of complete set is separable, so it need install solely.

1. Power interface: supply the working power to chassis from power board..
2. Background light control panel interface: control the switch and brightness of screen background light.
3. Remote control interface: support Toshiba receiving negotiation.
4. Control panel interface: 7 button control.
5. Sound output interface: sound signal output.
6. Program upgrading interface: upgrading program. Only for factory use.
Interface definition
DVB-T module
This chassis is DVB-T digital module, it can receive European digital broadcasting TV.
Interface definition
1.Power interface 1 Supply the working power to chassis from power board.
2. Power interface 2
Supply the working power to electric tuner from power board.
3. Sound output interface: Output the sound signal to the interface of speaker.
4. Signal interface
Output the image signal to the interface of image source..
5. Control panel interface
Connect control panel, press 7 button to control.
6. Speaker interface
Output the sound signal to the interface of speaker.
7. Serial port interface
For updating the process. Only use for factory.
PCB dimension specification
(1)PCB thick + the height of the tiptop component=20 mm
(2)PCB = 140mm*140mm
Screw hole specification: diameter 3.5 mm ,the hole position structure diagram.
Schematic

Saturday 8 February 2020

Apple iPhone - Forced quit – iPhone button customization- Keyboard short cuts


TIPS 
Force Quit
Press and hold the "Sleep/Wake" button for a few seconds until a red slider appears, and then slide the slider. Then press and hold the "Sleep/Wake" button until the Apple logo appears.
If the entire iPhone locks up - it can happen - press and hold both the "Home" button and the "Sleep/Wake" switch for eight seconds. You’ll see the screen go black, and then the Apple logo appears as the iPhone reboots.
Application download Pause
Taps on the application icon while it’s downloading and you’ll see the text change to "Paused". When you’re ready to resume this download touch the icon again and you’ll see the text revert back.
DFU Mode
To do this you need to turn your device off. When it is completely off, push and hold the power button. Count to 5 and then push and hold the home button (keeping the power button pressed down still). Count to 10 and then let go of the power button (keeping the home button pressed down). Count to 30 and you should hear some notification that the device has been put into DFU mode. Now you can restore it in iTunes.
Screen Shot
Hold the Home button, then hit the "Power/Sleep" button, the screen will momentarily flash, and the iPhone’s current screen contents will be saved to the Camera Roll.
Scrolling up
Simply touch the "Status Bar" at the very top of the screen (this is where the time is). When you’re in MobileSafari and the Mail application you will automatically scroll back up to the top of the page (or email).
Auto TLD
You have to have Google set as the default search engine for this to work. After this is set, you can just put "apple" into the browser, and press "Go". It’ll automatically take you to the Apple website.
Set content restriction
General -> Restrictions" then tap Enable Restrictions and enter a four-digit passcode to restrict your content.
Restrict incoming calls
To stop an incoming call from ringing, press the "Sleep/Wake" button. To send the call immediately to VoiceMail, press the "Sleep/Wake" button twice.
How to hide SMS preview
"General -> Passcode Lock" and enter a 4-digit passcode. After that disable "Show SMS Preview"
Scientific Calculator
You can turn it either way (left or right) and you’ll see the calculator go into landscape mode where you see your extra features/buttons.
How to share the URIs
A small Share button popped up in Safari, which created a new email and pasted the link into the body. Just hit the address bar to find it.
Punctuation keys to alphabet keys
To solve it, just press the ".?123" key, but don’t lift your finger as the punctuation layout appears. Slide your finger a half inch onto the period or comma key, and release. The ABC layout returns automatically.
Including extra punctuation keys
Touch and hold the punctuation key and you get a set of additional keys to choose from.
Wi-Fi IP
When you need to SSH into your iPhone or iPod touch you need to find out your local IP address.
Scrolling Safari
If you’re scrolling through Safari, the address bar comes with you, disappearing after the first few swipes. But no matter how far down you’ve scrolled, tapping the top of the screen (where the network and wireless icons are) will instantly rocket you back to the address bar.
If you haven’t been to a site with a drop-down search field (like the country chooser on Apple.com), go do so. Apple has even found a way to make that enjoyable.
Select other domain name endings
When you type a website URL in the address bar, you can now hold down the ".com" button to get a selection of other domain name endings and tap on any of the endings to insert them in the address bar.
Select other domain name endings
Tap "Setting -> General -> Network -> Cellular Data Network". In the "APN, Username and Password" field, simply type in some words so iPhone will not pass the correct values to service providers. Restart your iPhone if necessary.
Train your iPhone to learn new words
You can train your phone to "remember" words if you type them repeatedly, but this tutorial will teach you a better way to train your iPhone to learn new words on the fly.
Sensors
The iPhone has three cool sensors. First, it has an accelerometer that detects when you’ve rotated the iPhone into landscape orientation. In programs like Photos, Safari, and iPod, it triggers the screen image to rotate as well.
Behind the black glass where you can’t see them except with a bright flashlight are two more sensors: a proximity sensor that shuts off the screen illumination and touch sensitivity when the phone is against your head (it works only in the Phone application), and an ambient-light sensor that brightens the display when you’re in sunlight and dims it in darker places.
It experimented with having the light sensor active all the time, but it was weird to have the screen get brighter and darker all the time. So the sensor now samples the ambient light, and adjusts the brightness; it does this only once-each time you unlock the phone after waking it.
You can use that tip to your advantage. By covering up the sensor (just above the earpiece) as you unlock the phone, you force it to a low-power, dim screen-brightness setting (because the phone believes that it’s in a dark room). Or by holding it up to a light as you wake it, you get full brightness. In both cases, you’ve saved all the taps and navigation it would have taken you to find the manual brightness slider in Settings.
How to make full screen contact pictures
Browse to the contact and tap edit.
Tap on the photo.
Tap edit photo.
After it opens in fullscreen, tap set photo and save the contact.
Customize the iPod buttons
The iPod module on the iPhone starts out with buttons along the bottom for summoning four lists: Playlists, Artists, Songs, and Videos.
What about Albums, Genres and Composers?
They’re there, all right, but hidden; you have to tap "More" to see them.
But what if you use those lists more often than Artists or Songs? No problem: you can replace one of those starter buttons with a list of your own.
Tap "More", and then tap the "Edit" button (upper-left corner). You arrive at the
Configure screen. Here’s the complete list of music-and-video sorting lists:
Albums, Podcasts, Audiobooks, Genres, Composers, Compilations, Playlists, Artists, Songs, and Videos.
To replace one of the four starter icons, use a finger to drag an icon from the top half of the screen downward, directly onto the existing icon you want to replace. It lights up to show the success of your drag.
When you release your finger, you’ll see that the new icon has replaced the old one. Tap "Done" in the upper-right corner.
Save images in safari and mail
Touch and hold an image in Safari or Mail, an action sheet will be presented to enable you to save the image. The image will get stored in the "Saved Photos" library of the Photos app.
Access iPod controls or phone favorites instantly
Go to "Settings -> General -> Home Button". Double taping the home button goes to "Home", "Phone Favorites" or "iPod Controls".
Forward/rewind music & video
Press and hold the skip forward/back arrows to fast forward or rewind rather than skip tracks. Also, press on the album art to manually FF/rewind.
iPhone as a Modem
You can use iPhone 3G or later as a modem to connect, or tether, your computer to the Internet. You can connect iPhone to your computer using the Dock
Connector to USB Cable, or via Bluetooth.
In Settings, choose "General -> Network -> Internet Tethering".
Slide the Internet Tethering switch to On.
Connect iPhone to your computer.
USB: Connect your computer to iPhone, using the Dock Connector to USB Cable.
In your computer’s Network services settings, choose iPhone.
On a Mac, a pop-up window appears the first time you connect, saying "A new network interface has been detected". Click Network Preferences, configure the network settings for iPhone, then click Apply. On a PC, use the Network Control Panel to configure the iPhone connection.
Bluetooth: On iPhone, choose "Settings -> General -> Bluetooth" and turn on
Bluetooth. Then refer to the documentation that came with your computer system software to pair and connect iPhone with your computer.
When you’re connected, a blue band appears at the top of the screen. Tethering remains on when you connect with USB, even when you aren’t actively using the Internet connection.
Monitor your cellular data network usage:
In Settings, choose "General -> Usage".
Double-Tapping
In Photos, Google Maps, and Safari (the Web browser), double-tapping zooms in on whatever you tap, magnifying it by a factor of two.
In the same programs, as well as Mail, double-tapping means, "restore to original size" after you’ve zoomed in. (Weirdly, in Google Maps, you use a different gesture to zoom out: tap once with two fingers. That gesture appears nowhere else on the iPhone.)
When you’re watching a video, double-tapping eliminates or restores letterbox bars.
Standard TV shows are squarish, not rectangular. So when you watch TV shows, you get black letterbox columns on either side of the picture.
Movies have the opposite problem. They’re too wide for the iPhone screen. So when you watch movies, you wind up with letterbox bars above and below the picture.
How to maximize battery life
a. Turn down the LCD. The new iPhone’s screen is brighter. You may save your battery power by changing "Settings -> Brightness". I keep mine at 10% brightness.
b. Turn off Vibrate in Games. Playing a game with vibrate happening frequently is an unnecessary battery suck. If you can turn it off.
c. Limit use of A-GPS tracking. GPS tracking is still pretty useless after you've gained your bearings, since there isn't a turn by turn navigation mode for driving.
I exit out of maps once I've got the directions in my mind, and if I lose myself again, I just start maps up once more.
d. Turn off Wi-Fi new network scanning or Wi-Fi
e. Toggle off 3G till ready.
f. Buy Apps and Songs in iTunes at your computer not over Wi-Fi or Apps over 3G.
g. Set the Autolock to 1 or 2-minutes. It can be set under "Settings -> General -> Autolock".
h. Use programs with 3D less often. Not surprisingly, I've noticed that when I play games rendering 3D, battery life drops. Using the graphics chips more intensely will crank up power usage, but maybe the drain is also because of the nature of gaming: Unlike email or browsing, gaming is a full-time, full attention endeavor that also keeps the CPU, GPU and LCD going full-time. (I'd like to think this is a more useful tip than "don't use your iPhone" but maybe it's not something you can avoid if you're a gaming addict.)
I. Set Push to Off, and Set Fetch Time. Push email isn't that useful for me because I know I'm getting emails all day long and that I have to be checking all the time. Push does use more juice than the fetch mode, which checks for calendar, contact and email syncing at set intervals of 15 minutes to an hour. I set mine to 1 hour unless I'm out of the office. If you seldom update your contacts and calendars, you might even be better off syncing by cable to iTunes, while you pick up a charge.
J. Stay Juiced. If you're at computer or in a car, you should try to use a cigarette adapter or USB cable to pick up a few minutes of charge.
Keyboard Shortcuts 1
When typing on your iPhone’s keypad, if you make a mistake, and your iPhone offers up the correct word underneath your misspelling, click the SPACE bar to accept the suggestion. (To ignore the suggestion, just keep typing.)
Keyboard Shortcuts 2
If you realize you’ve made a typing error a few sentences back, tap your finger where the mistake was made to position the cursor there. You can then correct the error, and use the same technique to return to your previous position in the text.
Keyboard Shortcuts 4
Double-tab the SPACE bar to add a period followed by a space
Keyboard Shortcuts 5
Double-tap a picture, map, or web page to zoom in on it
Keyboard Shortcuts 6
In Safari, after scrolling to the bottom of the page, tap the top of the screen to immediately return to the top of the page.
Keyboard Shortcuts 7
Visit yahoo/listings, click the + button, and click Add to Home Screen. You now have one-click access to your local TV listing. Okay, so I’m a TV junkie.
Keyboard Shortcuts 8
If you’ve ever flicked so hard that the web page you’re navigating scrolls way past where you want to be, you can stop scrolling by tapping the page during the scroll.

Sunday 2 February 2020

Remote control Chromecast - how to setup


Chromecast remote control set-up procedure
How to set Chromecast remote control
Follow the steps to configure the Chromecast 
Step 1:
Insert the Chromecast into the television set into one of  HDMI ports.
Step 2:
Attach the USB connector cable to the Chromecast and attach.
other end to a power source; either a USB power adaptor connected to a wall outlet (Highly recommended) or television set.
Step 3:
Change your TV input to whichever port you plugged your  Chromecast into.
Step 4:
Turn on the device you wish to cast your Chromecast onto.
# For IOS/Android devices go into the app store/ Google play  store and download the “Chromecast” app or go to  “google.com/Chromecast/setup”.
# For Mac/PC open up your chrome browser (Note must use  a chrome browser no other browser currently supports  this) and go to “google.com/Chromecast/setup”.
# Side Note: Your Chrome browser also needs to be up  to date with the latest version for the device to work.
# To update go to settings then click the “Help” on the  left hand side this should take show you which  version you are using and how to update. You can also type “chrome://help” in the address bar and this  will take you to the same page.
Step 5:
Turn on your Chromecast and screen that displays “set me  up” at the top should appear with a default Chromecast name such as  “Chromecast2372” at the bottom.
Step 6:
 From the “google.com/Chromecast/setup” page or app/Google  play store download the Chromecast software onto your  IOS/Android/Mac/PC. Once downloaded open program/app to begin  using your Chromecast.
Step 7:
Select your Chromecast; it should be something like  “Chormecast1345”.
# For mobile devices go to your devices Wi-Fi setting and select  your Chromecast device. You should be prompted to do this once  you click “Set up a New Chromecast”.
# On your Mac/PC it should automatically scan for Chromecast  devices so all you have to do is click continue once you see your  Chromecast.
Step 8:
You should be prompted to change your TV input until you  see a screen with your code. Once you do click “that’s my code” to continue.
Step 9:
Next you are prompted to create your device name and log  into your wireless network. Once you’ve done that click continue.
# Its important that your Chromecast and your device are on the  same network
# If you’re trying to connect from Rutgers you will need to talk to a  network administrator to connect to RUWireless/LAWN. If you’re doing this at home it should work fine.
Step 10:
Your Chromecast should now be set up with a message on  your TV saying “reading to cast” now on your device open up an app  that supports Chromecast or simply open your chrome browser and  click cast symbol
Chrome cast Update (casting entire screen or new tab)
# Ensure the Google chrome browser you are using is fully updated and then visit Google for chrome  extension for chrome cast:
After the extension has installed successfully, click the Google cast  icon in the top right hand corner of you chrome browser.
Next click the drop down arrow located on the chrome cast  extension menu.
Click ‘Cast entire screen (experimental)’ or ‘Cast current tab’ in  the drop down menu.
Then click the chrome cast device you would like to use to cast  your entire screen or cast the tab you are on. (e.g.  HSChromecast6910
)
Your entire screen or current tab should now be showing on the  display device the Google chrome cast is plugged into.

Saturday 1 February 2020

KLIPSCH SW12-I schematic and trouble shooting - 2sc3281 -2sa1302 -mjf15031 -mjf 15030


INPUTS
            There are two types of inputs and passive outputs. Four RCA jacks for LINE LEVEL left and right inputs and outputs and a panel of SPEAKER LEVEL inputs and outputs for left and right stereo channels. The SPEAKER LEVEL inputs have a high pass filter on each channel that allows frequencies above 120 Hz to go directly to the main speakers of the system. Frequencies below 120 Hz go through the sub-woofer amplifier and on to the woofer. The LINE LEVEL inputs also use a high pass filter that allows frequencies above 80 Hz to go back out to a system amplifier. Frequencies below 80 Hz go through the sub-woofer amplifier and on to the woofer. Both filters have a 6dB per octave roll off.
SIGNAL CONDITIONING
         The first op-amp of U1, a quad op-amp IC, is a summing amp for the RCA and SPEAKER level inputs. The LEVEL adjustment is located between the first and second op-amp stages of U1. The second op-amp of U1 is a buffer stage with a gain of 1. The third op-amp of U1 is a High pass filter configuration. The fourth op-amp of U1 is used to adjust phase from 0° to 180°. The next circuit is an adjustable RC filter for low pass filtering from 40Hz to 120Hz consisting of U2 and
U4.
COMPRESSION
The compression circuit consists of U5, U6, and Q28 and is adjusted via R30. If adjusted correctly, this circuit will limit the amplitude of the signal so the minimum amount of distortion in the form of clipping will occur at the output of the amplifier. R34 is used to set the maximum output level for the amplifier so it doesn’t under-amplify or clip. Next, the signal goes through a buffer amplifier U2, which provides a gain of 4. Then the signal goes on to the driver circuits.
DRIVER CIRCUIT
          The driver circuit consists of Q1 through Q12 and is located on the Filter/Driver board. The driver circuit has a DC offset adjustment, R50, which should be set at 0 Vdc +/- 50mVdc. This can be measured across the + and - output wires (white & black respectively) from the amp with power on and no signal applied. The driver circuit is a Class AB amplifier.
OUTPUT
           The output section of this amplifier uses discrete components Q15 through Q26 to obtain the high power output required. The output amplifier circuit is a Class AB complementary symmetry configuration with three sets of four transistors cascaded. This provides high power output into a low impedance load. The components for the output circuit is located on the Power Board.
POWER SUPPLIES
           The main power supply circuit is unregulated and supplies +/- 81 Vdc for the output and driver circuits. The +/- 81 Vdc is then divided and regulated by 34V zener diodes to supply +/- 34 Vdc to bias the driver circuit. There is a second power supply which is fed by a second set of taps off of the transformer. This is the regulated +/- 15 Vdc for the op-amps on the filter board.
OTHER FEATURES
                This amplifier uses a control circuit to control the operation of the output relay. When power is first applied the circuit provides a delay before activating the relay. This is a protection feature to protect the speaker and amplifier from initial current surges. The circuit also provides protection from over-current conditions by de-activating the relay when excessive output current is sensed. The relay and it’s control circuitry is located on the Filter/Driver Board and consists of U11, U12, RLY 1 and R131. R131 is used to set the threshold level for over-current sensing.
Align sub woofer amplifiers.
Equipment required:
A signal source capable of supplying a 30Hz sine wave at 300mVrms.
A true RMS Voltmeter such as the Fluke 8060B.
A 16 ohm load rated for at least 200 Watts.
An oscilloscope (optional).
To totally align SW12 series 1 amplifiers, follow this procedure:
1. Disconnect power from the UUT (unit under test).
2. Connect the UUT (unit under test) to a 16 ohm load.
3. Connect a signal generator to the RCA input of the amp.
4. Set all controls on the UUT to their full clockwise position.
5. Set the signal generator for 30Hz and 60mVrms output. (be sure and measure the output of the generator for 60mVrms.)
6. Connect the voltmeter leads to the output of the UUT.
7. Apply power to the UUT.
8. Adjust R34 for 33Vrms. Range is from 32.1 Vrms to 34 Vrms.
9. Change signal level to 1.5mVrms @ 30Hz .
10. Measure the output voltage. Should be between .94 Vrms and 1.06Vrms. Adjust R30 if necessary.
11. Alignment of the UUT is now complete. Disconnect power and other connections from the UUT
NOTE: Some interaction between adjustments is common. Recheck steps 8 and 10 for proper voltages.
Schematic
TROUBLE SHOOTING 
A. Blows fuse with nothing connected to the output.
1. Check output transistors on power board.
Replace transistors that are shorted.
2. Check driver transistors on filter/driver board. Replace transistors that are shorted.
3. Check U7 and U9 for shorts.
4. Check bridge rectifier in power supply circuit.
5. Check transformer.
6. Check filter capacitors. C21,C22, C23, C24, C44, C45, C46, and C47.
7. Check for pinched wires going to and coming from
the transformer.
B. Low output level using speaker level inputs.
1 Check inputs for correct polarity from source. If polarity is not correct, the signals will be 180° out of phase and will cancel each other out causing a low output.
2 Check R79 and R80.Should read 91K:.
3 Check U13.
4 Check for proper signal flow using schematic.
C. Causing popping sound.
1 Connect amplifier output to a 16 ohm load. Apply a 60mVrms 30Hz signal to one RCA jack. The voltage across the load should be between
32.1 Vrms and 34 Vrms for SW12.
29.1 Vrms and 30 Vrms for SW15. For the THX amp., apply a 3Vrms 70Hz signal to one RCA jack. The voltage across the load should be between 35.1 Vrms and 36 Vrms. If this is correct, connect an oscilloscope to the
output signal and look for clipping. If the voltage was too high, re-align amplifier per procedure.
If the signal was clipped, re-adjust the amplifier per alignment procedure on page 5, 6, or 7.
D. Excessive hum.
1 Check all ground connections.
2 Check all filter capacitors. C21, C22, C23, C24, C44, C45, C46, and C47.
E. Amplifier quits working after a short period of time.
1 Check for excessive heat on heat sink. This indicates a a bad output device or a bad thermal switch.
2 Check output relay (RLY1).
3 Check U11 and U

LG 32LK610BPUA, LG 32LK610BBUA LCD TVs – How to upgrade the software, fault checking method

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