Sunday, March 13, 2016

Apple iPhone 4 – Test procedures - Touch screen an accelerometer test – GPS test – wifi test – Bluetooth test – Main camera test – Video output test – Ambient light sensor test – Main camera and led adjustment – Proximity sensor test – compass test – Mobiles and smart phones repair and service

Category: Mobile and Smartphones Repair and Service 

Contents of this article 

  • Touch and Accelerometer test
  • Ambient Light sensor test 
  • Wifi and Bluetooth test 


Apple iPhone 4

Functional Testing
Adjust Main Camera and LED
The main camera can be knocked out of alignment by removing and reinstalling the back cover. Adjustment can be made by gently pushing the main camera module in the direction needed for proper alignment.
Important: Do not touch the lens of the main camera with bare fingers. Only touch the surrounding area or use gloves to ensure debris or fingerprints are not transferred to the camera lens.
Clean Main Camera
1. Use a clean microfiber polishing cloth to remove smudges from the camera lens and the back cover lens.
2. Check the back cover lens for scratches that could affect image quality. Test Front Camera
1. Launch the Camera app. Tap the icon of a camera with two arrows in the upper right corner of the screen.
2. Using a printed color copy of the Test Image (last page of this guide), fill the screen with the Test Image. To take a photo, tap the camera button at bottom center of screen.
3. Verify the primary colors are representative of the printed Test Image and no dark spots are near the edges of the photo.
Note: Resolution of the front camera is different than the main (rear) camera. Also, the front camera does not have a flash.
Test Buttons and Switches
1. From the Home screen, open any app, then press the Home button to return to the Home screen.
2. Press the volume up/down buttons along the left edge and look for indicator on the display that sound level is changing.
3. Flip the Ring/silent switch back and forth and look for a bell icon on the screen. IPhone should vibrate when placed in silent mode.
4. Press the On/off button on the top edge to put iPhone into sleep mode (the screen will go blank). Press this button again to wake iPhone.
Test Ambient Light Sensor
The ambient light sensor (ALS) automatically adjusts the display brightness to an appropriate level for the current ambient light conditions. The ALS brightens the display when using iPhone in a bright light environment, and dims the display in low light.
1. Press the On/off button to put iPhone into sleep mode.
2. In a bright light environment, cover the top third of the front of iPhone to block the light (the heel of your hand works well). The ALS is located near the receiver.
3. Press the On/off button to wake iPhone, then slide to unlock. While the ALS is covered, the display should be dim.
4. Uncover the top of iPhone. After a few seconds, the display should return to normal
brightness.
Test Proximity Sensor
The proximity sensor detects when iPhone is held close to the user’s ear and immediately turns off the display to save power and prevent unintended touches.
1. From the Home screen, launch the Phone app.
2. Call an approved toll-free number for testing.
3. Cover the top front of iPhone with your hand. The display should go blank.
4. Remove your hand. The display should turn back on when the sensor is uncovered.
5. End the call.
Test Multi-Touch and Accelerometer
1. Launch the Calculator app (in the Utilities folder by default) to test all but the top row of the screen. Tap each button on the calculator to verify activity.
2. Hold the device in a vertical plane (upright), not horizontal (flat). Rotate iPhone to the left to launch the scientific calculator. Tap all the buttons in the two columns at furthest left.

Test Wi-Fi
1. Go to Settings > Wi-Fi and connect to a known-good Wi-Fi network
2. Launch Safari app and attempt to connect to a known-good website. Verify that the page fully loads.
Test Bluetooth
1. Make a known-good Bluetooth device available locally. Make sure the device is powered on and discoverable.
2. On iPhone, go to Settings > General > Bluetooth and verify that Bluetooth is on. iPhone will search for nearby Bluetooth devices.
3. Pair iPhone with Bluetooth device.
4. To unpair a device, tap the blue circle to the right of the device’s name and then tap “Forget this Device.”
Test GPS
iPhone uses signals from GPS satellites, Wi-Fi hot spots, and cellular towers to get the most accurate location. If GPS is available, the location indicator will be a blue ball. GPS testing requires line of sight to the sky for a satellite lock.
1. Go to Settings > Wi-Fi and connect to a known-good Wi-Fi network.
2. Launch Maps app and tap the arrow button in the lower left corner of the screen. Maps should show your current location.
Test Compass
Maps uses the built-in compass to determine your heading. The angle shows the accuracy of the compass reading—the smaller the angle, the greater the accuracy.
1. Move to a location away from magnetic fields.
2. Go to Settings > Wi-Fi and connect to a known-good Wi-Fi network.
3. Recalibrate Compass by waving iPhone in a figure-eight motion.
4. Launch Maps app and tap the arrow button in the lower left corner of the screen. Tap the arrow button again to activate the compass.
5. Verify that when iPhone is rotated, the heading shown on screen adjusts accordingly.
Test Video Out
This test requires a TV with composite and/or component inputs plus Apple Composite AV
Cable and/or Apple Component AV Cable.
1. Go to Settings > Wi-Fi and connect to a known-good Wi-Fi network.
2. Connect the relevant video-out cable (composite or component) to device and to TV.
3. Launch the Videos app (iOS 5) or iPod app (iOS 4).
4. Select a test video and begin playback.
5. Verify that video plays on TV and that colors are correct.
Note: If movie plays in black & white, verify that correct video-out signal is selected (NTSC/PAL).
Test Main Camera
1. Remove any protective case that may interfere with camera lens or flash.
2. To take a photo: Launch the Camera app. Make sure slider in bottom right corner is set to camera and not to video. Aim iPhone and tap the camera button at bottom center of screen.
# Using a printed color copy of the Test Image (last page of this guide), fill the screen
with the Test Image before taking a photo.
# Verify that the primary colors are representative of the printed Test Image and no dark spots are near the edges of the photo.

3. Change the focus area and set exposure: A rectangle on the screen shows the area where camera is focusing the shot. Tap the screen to focus on the circle of the Test Image. The camera automatically adjusts the exposure for the selected area.
4. Zoom in or out (camera mode only): Pinch the screen, then use the slider at the bottom of the screen to zoom in or out.
5. Set LED flash mode (camera or video mode): Tap the flash button in the upper left corner of the screen, then tap On.
# If available, take the photo in a dim or darkened area to show where the flash is lighting.
# Make sure flash is lighting the circle in the Test Image and is not shifted to one side.