Specifications

iPhone 4 Symptom Charts — Display Issues 42
2012-02-21
Multi-Touch Issues
Known-Good Parts & Materials Required: none
Quick Check
Symptoms Quick Check
• Multi-Touch is slow to respond
• Isolated areas not responding
• Slider to turn on/o not
responding
• Erratic response to touch
• Display turns on briey and a
battery icon ashes
1. Clean the display with a clean micro-ber
cloth. Important: Do NOT use liquids, sprays, or
abrasives to clean the device.
2. Rule out environmental causes by checking for
use of protective lms, cases, gloves, or a stylus.
Verify that user touches screen with nger pads
and not ngernails.
3. On the device, go to Settings > General >
Software Update to verify device has the most
up-to-date software. If unavailable, verify by
plugging the device into iTunes.
4. Quit any background apps.
5. Restart the device.
6. Reset the device.
Deep Dive
Check Result Action
1. Test Multi-Touch.
Launch the Calculator app and
perform the following tests:
- With the device in a vertical
orientation, test all the
calculator buttons.
- Turn the device to a horizontal
orientation and test all the
calculator buttons.
Did the display respond as
expected?
Yes Issue resolved.
Remind user that protective lms,
cases, styluses, gloves or ngernails can
prevent Multi-Touch from responding
properly.
No Determine if the issue is caused by
accidental damage. Refer to the Visual
Mechanical Inspection guidelines.