iTech Training Courses
iPhone 4 CDMA Display Replacement Guide iPhone 4 CDMA
©2014 iCracked, Inc. All rights reserved. iOS, all Apple product names, and Apple logos are trademark property of Apple, Inc.
The content of this training is for iTech training within iCracked, Inc. Users of this training program are not permitted to copy, sell, reproduce, distribute, or otherwise share this content, either in part or as a whole, with others. Misuse of the content of this training will be viewed as a violation of any license or employment agreement with iCracked. iPhone 4 CDMA ESD SAFETY!
iCracked likes to stay on the safe side of repairs, and by using ESD (Electrostatic Discharge) safe tools and equipment, you can be sure to avoid static damage to your mobile device.
ESD damage is difficult to diagnose as its effect isn’t usually immediately apparent, but sensitive sections of the logic board can nevertheless get weakened by static, and in turn become non-functional over time. Whether you are replacing a touch screen digitizer or an LCD screen, doing your repair with ESD safety in mind can save the long-term circuitry and functionality of your device. iPhone 4 CDMA EYE SAFETY!
It is important that you understand that Safety glasses should be worn when working on any iOS device.
Eye injuries are very common. Every day an estimated 1,000 people suffer an eye injury at work. Approximately 10% of these injuries are severe enough to require days away from work to recover. While the financial cost of these injuries are substantial, no dollar figure can adequately reflect the personal toll these incidents take on the injured employee. iPhone 4 CDMA GLOSSARY
GSM - Acronym for Global System for Mobile Communica- SIM Card - Subscriber Identity Module is an on-board tion. It is another network standard (like CDMA) used by memory card that identifies a user. You can swap GSM carriers such as T-Mobile and AT&T. SIM cards between handsets. Home button - The physical button that is found on the Digitizer - Thin capacitive touch film on glass that converts bottom of the iPhone screen. analog touch signals to digital reactions by the processor. Power/Sleep/Wake Button – Located at the top of the Capacitive Touch - Screens that use a layer of capacitive iPhone. Long press turns on from being powered off. material to hold an electrical charge; touching the screen When powered on, a quick tap will wake the screen and changes the amount of charge at a specific point of light up the LCD. When in-use a quick tap will place the contact. In resistive screens, the pressure from your finger unit in sleep mode, turning off the LCD and digitizer. causes conductive and resistive layers of circuitry to touch iOS - Apple’s Operating System that runs mobile devices. each other, changing the circuits’ resistance. It has many versions, like iOS 2, 3, and 4. Standoff Screw - A standoff is a threaded separator of Ambient Light Sensor – Detects the amount of UV light defined length used to raise one assembly above another. and dims the LCD for best viewing. iPhone 4 CDMA TOOLS AND PARTS
Tools Required: Parts Needed:
• ESD-Safe Nylon Spudger • Replacement Display Assembly • ESD-Safe Tweezers • Proximity Cover Foam • ESD-Safe #00 Phillips Screwdriver • Display Adhesive set • ESD-Safe 1,8x40 Flat Head screwdriver • iPhone Pentalobe Screwdriver • Phillips #000 • iSesamo or Plastic opening tool • Metal Spudger iPhone 4 CDMA MODEL NUMBERS
CARRIER CAPACITY BLACK WHITE Verizon (CDMA) 8 GB MD146LL/A MD200LL/A
Verizon (CDMA) 16 GB MC676LL/A MC677LL/A A1349 Verizon (CDMA) 32 GB MC678LL/A MC679LL/A iPhone 4 CDMA IDENTIFY DEVICE
NOTE: The iPhone 4 CDMA is the only iPhone that does not have a SIM card tray or a SIM card. iPhone 4 CDMA IMPORTANT!
• Before working on any iOS device, make sure to test all of the functions that are described in the iTech app.
• Power off the device before performing any repairs!
• If you have any questions before starting a repair, contact your iTech manager or the SOS Hot line at 855-442-7225. iPhone 4 CDMA REPAIR PREP
Use the iTech application to complete the Pre-Repair checklist; this checklist must be completed and verified by the customer prior to starting the repair.
The pre-repair checklist is your way of provid- ing proof of what did or did not function prior to repair, which is why its so important to use the app and have the customer verify and sign.
NOTE: An easy way to test the proximity sensor is activate voice control and start talking. If you place a finger over the ambient light sensor hole just above ear speaker grill, the screen should go dim. iPhone 4 CDMA POWER DOWN TO BEGIN Hold the power/sleep button down until “slide to power off” shows up on the screen. Slide the arrow from left to right.
If the digitizer is not functioning: Power off the iPhone by holding down both the power/sleep button and the home button. Continue holding down as the Apple™ logo appears until the screen goes black.
If the power button does not function: Using assistive touch, tap the white bubble > Device > press and hold “Lock Screen” until the “slide to power off” drops down, and then slide the arrow from left to right. iPhone 4 CDMA
step Remove Dock Screws 1 Remove the two Pentalobe or Phillips screws located on the left and right side of the dock connector port.
NOTE: Some iPhone 4 GSM have Phillips Head screws instead of Pentalobe screws.
QTY MATERIAL 2 3.6 mm Pentalobe screw iPhone 4 CDMA
step Slide Back 2 Slide the rear panel toward the top of the iPhone until it stops, then lift to remove. iPhone 4 CDMA
step Remove Back 3 Completely lift off and remove the rear panel and set aside. iPhone 4 CDMA
step Disconnect Battery 4 Remove the single Phillips head screw holding the battery connector in place.
NOTE: Disconnect the battery connector before lifting the battery in order to prevent any possible electrical damage to the iPhone.
QTY MATERIAL 1 1.5 mm Phillips screw iPhone 4 CDMA
step Disconnect Battery 5 Use the flat end of the nylon spudger to lift between the battery and battery connector. Gently lift the connector upward using the battery as leverage. iPhone 4 CDMA
step Remove Battery 6 Lift the plastic pull tab to remove the battery.
NOTE: If the plastic pull tab breaks or is missing, use the flat end of the nylon spudger to gently pry out the battery by inserting the spudger between the lower outside corner of the battery and the frame, and lifting. iPhone 4 CDMA
step Set Pull Tab 7 If it is still there, fold the plastic pull-tab over and stick it to the adhesive remaining on the frame to keep it from getting in your way during the repair. iPhone 4 CDMA
step Five Screws 1. Remove the five screws 8 2. holding the EMI shield in place.
DO NOT remove the shield. 3. 1.
# QTY MATERIAL 1 3 1.3 mm Phillips screw 2 1 1.5 mm Phillips screw 1. 3 1 2.4 mm Phillips screw iPhone 4 CDMA
step Rotate EMI Shield 9 Rotate clockwise from the upper edge of the shield to unlatch the bottom retaining bracket. iPhone 4 CDMA
step EMI Tabs 10 Pull the bottom tabs of the EMI shield out from the slots cut into the mid-plate of the logic board.
You may then remove the EMI shield from the phone. iPhone 4 CDMA
step Wi-Fi Shield 11 Remove the single 1.5mm Phillips screw holding the Wi-Fi EMI shield in place.
QTY MATERIAL 1 1.5 mm Phillips screw iPhone 4 CDMA
step Remove Shield 12 Using tweezers, remove the Wi-Fi EMI shield clip by lifting upward on its larger end. iPhone 4 CDMA
step Flex Cable Screws 13 Remove the two dock connector flex cable retaining plate screws and the plate.
QTY MATERIAL 2 1.8 mm Phillips screw iPhone 4 CDMA IMPORTANT!
When disconnecting the flex cables that are plugged into the logic board take your time and look. You can easi- ly render a logic board irreparable by knocking Carefully look closely off small components at each connector and on the logic board. lift with the spudger only on the underside of the cable cap. iPhone 4 CDMA
step Disconnect Charging Port 14 Use the pointed end of the nylon spudger to lift the connector on the side closest to the lower shield.
Peel back until adhesive is free then roll outward as shown.
CAUTION: The charging port flex cable is held in place with adhesive. Be gentle when pulling it off as you don’t want to tear the cable. iPhone 4 CDMA
step Remove Antenna Plate 15 Remove the single screw holding the service antenna retaining plate in place.
Use tweezers to lift and remove the service antenna retaining plate.
QTY MATERIAL 1 1.6 mm Phillips screw iPhone 4 CDMA
step Disconnect Antenna 16 Use the pointed end of the Spudger to disconnect the antenna connector. iPhone 4 CDMA
step Reposition Antenna 17 Gently reposition the service antenna from the installed EMI shield so that you may freely work on the logic board. iPhone 4 CDMA
step Disconnect Rear Camera 18 Use the pointed end of the nylon spudger. Slide the spudger underneath the flex cable approximately 2mm and lift upward to disconnect the rear-facing camera from the logic board as shown. iPhone 4 CDMA
step Disconnect Audio Control 19 Disconnect the audio control cable from the logic board using the pointed end of the nylon spudger at the left center of the connector as shown. iPhone 4 CDMA
step Disconnect Power/Prox 20 Disconnect the power/ proximity flex cable using the pointed end of the nylon spudger at the left center of the connector as shown. iPhone 4 CDMA
step Disconnect Front Camera 21 Disconnect the front-facing camera flex cable using the pointed end of the nylon spudger at the left center of the connector as shown. iPhone 4 CDMA
step Disconnect Digi Cable 22 Use the pointed end of the nylon spudger to disconnect the digitizer flex cable from the left corner. iPhone 4 CDMA
step Disconnect LCD Cable 23 Disconnect the LCD flex cable using the pointed end of the nylon spudger at the left center of the connector as shown. iPhone 4 CDMA
step Disconnect Wi-Fi Cable Disconnect the Wi-Fi flex 24 cable connector by lifting on its upper left corner. iPhone 4 CDMA
step Remove Rear Camera Use tweezers to remove the 25 rear-facing camera. iPhone 4 CDMA
step Three Logic Board Screws 1. Take a quick look over the 26 logic board for dirt, debris, or any possible damage.
Remove the three standoff screws shown using a 1,8x40 2. Flathead Screwdriver.
# QTY MATERIAL 1 1 4.8 mm Standoff screw 2 2 3.6 mm Standoff screw
2. iPhone 4 CDMA
step Grounding Clip 1. 1. Remove the sticker on the 27 upper left corner of the logic board (beneath the camera). Set aside to use in reassembly.
2. Remove the single Phillips head screw.
3. Remove the gold 2. 3. grounding clip with tweezers.
QTY MATERIAL 1 2.5 mm Phillips screw iPhone 4 CDMA
step One Logic Board Screw Remove the single Phillips 28 head screw from the lower left side of the logic board just above the vibrator motor.
QTY MATERIAL 1 3.4 mm Phillips screw iPhone 4 CDMA
step Remove Logic Board Lift the lower edge of the 29 Logic Board to a 30-degree angle with respect to the iPhone.
Pull it toward you to remove it. iPhone 4 CDMA
step Remove Vibrate Motor Remove the vibrator motor by 30 sliding an iSesamo or metal spudger tool under the flex cable to break the adhesive loose. iPhone 4 CDMA
step Speaker Screws Use a #00 Phillips screwdriver 31 to remove the screws on the speaker.
QTY MATERIAL 2 2.4 mm Phillips screw iPhone 4 CDMA
step Speaker Bracket Use tweezers to remove the 32 plastic bracket from the left side of the speaker. iPhone 4 CDMA
step Remove Speaker Rotate the loud speaker 33 upward to remove. iPhone 4 CDMA
step Four Corner Screws Remove the four corner 34 screws on the inner edge of the frame.
QTY MATERIAL 4 1.6 mm Phillips screw iPhone 4 CDMA
step Six Frame Screws Loosen the 6 large-headed 35 center screws with one complete 360° turn of the screwdriver. NOTE: Although the screws can be removed, it’s easier and faster to replace the LCD assembly if you simply loosen and leave them in place.
QTY MATERIAL 6 1.6 mm Phillips screw iPhone 4 CDMA
step Separate the Assembly Turn the phone around and 36 insert the iSesamo tool at the upper right corner of the iPhone. Work your way around the phone in a clockwise motion, separating the display and frame.
Take caution near the home button area. Stop at the upper left corner.
NOTE: NEVER use the iSesamo tool at the top of the iPhone near the front camera and proximity sensor! iPhone 4 CDMA
step Separate the Assembly Carefully pull the display 37 assembly away from the frame.
The LCD and digitizer flex cables are routed through the mid-plate. iPhone 4 CDMA REASSEMBLY PREP
Now you have separated the broken screen and will prepare to install the new screen.
In most cases the glass is shattered. The fastest way to clean up the bits and pieces of glass is to peel the adhesive that the glass is stuck to off the frame. Apply new adhesive stickers onto the frame. iPhone 4 CDMA REASSEMBLY PREP
Peel the Front-Facing camera centering ring off of the old LCD assembly.
Align and drop the centering ring into the front-facing camera on the new LCD assembly. iPhone 4 CDMA IMPORTANT!
Apply a new proximity sensor foam over the ALS (Auto-light Sensor) and proximity sensor.
This simple step will fix 95% of all proximity sensor issues! iPhone 4 CDMA REASSEMBLY PREP
Transfer the LCD and digitizer foam pads from the original LCD and digitizer cable if not pre-installed on the replacement display assembly.
This simple steps prevents the connectors from accidentally popping off, as the EMI shield applies force on the pads to keep the cables properly connected. iPhone 4 CDMA REASSEMBLY PREP INSPECTION AND CLEANING
Check the mid-plate frame, and remove any glass or debris that may have fallen. Failure to clear this area could fracture the LCD upon reassembly.
Clean around the frame using 91% alcohol and a brush or an alcohol prep-pad.
Remove any debris around the home button using alcohol and brush.
Inspect the home button to see if it should be replaced. iPhone 4 CDMA
step Remove Cover Remove the protective 38 cover on the back of the new display assembly.
WARNING: Failure to remove the protective cover from the mirrored back of the display assembly will damage the LCD. There is a thermal pad installed on the iPhone frame that absorbs the heat from the LCD and disperses it though the frame, preventing the LCD from overheating. iPhone 4 CDMA
step Cables Through Midframe Guide the LCD and Digitizer 39 flex cable’s through the opening in the mid-frame.
Pay special attention to the digitizer cable loop; this tends to get caught.
NOTE: You will know that both cables are routed correctly through the mid-frame if they are of equal length. If one cable is shorter than the other, then the flex cable is most likely caught on the Mid-Frame. iPhone 4 CDMA
step Top Corners First Insert the top corners of 40 the display assembly first. iPhone 4 CDMA
step Verify Cables Verify that the LCD and 41 digitizer flex cable equal height.
If one cable is shorter than the other, then the flex cable is most likely caught on the Mid-Frame. Pull the display assembly back and correct the problem. iPhone 4 CDMA
step Set Screen Assembly On the inside frame, tilt the 42 iPhone sideways to get the washers to drop onto the screw heads. Make sure that the flat washers are on the outside of the center holding plate, not touching the frame.
The order should be: 1. 1. frame 2. 2. assembly holding plate 3. 3. washer 4. 4. screw head
NOTE: Use tweezers to gently push the tabs against the frame. iPhone 4 CDMA
step Tighten Side Screws Lay the display assembly 43 against the frame, and then lay the iPhone down on a flat surface. Tighten the middle left and right side center screws.
DO NOT tighten the other center screws at this time. iPhone 4 CDMA
step Insert Corner Screws Insert and tighten the four 44 corner screws using a #00 Phillips screwdriver.
Keep the iPhone down on a flat surface, and maintain steady pressure on the corner you’re working on.
QTY MATERIAL 4 1.6 mm Phillips screw iPhone 4 CDMA
step Tighten Remaining Screws Tighten the remaining four 45 side screws, and ensure that all ten screws are now tight.
Check the frame and ensure the display assembly is sitting flush against it.
Reinstall the sticker previously set aside on the upper left corner. iPhone 4 CDMA
step Align Motor Align the mount over the 46 screw hole and reapply the vibration motor into the frame.
NOTE: Inspect the springs of the vibration motor to ensure that they are not damaged or bent. iPhone 4 CDMA
step Check Microphone Boot Verify the lower microphone 47 rubber boot has not rolled out of its housing. If it has fallen out of place, reinsert it. iPhone 4 CDMA
step Install Speaker Insert the speaker into the 48 bottom of the iPhone at a 45-degree angle. iPhone 4 CDMA
step Check Tabs Use the flat end of the plastic 49 Spudger to ensure that the 4 metal tabs are dropped into the mid-plate area.
NOTE: The speaker will spring upward if constant pressure is not maintained during reinstallation until screws are reinstalled. iPhone 4 CDMA
step Speaker Screws Insert and tighten the right 50 side Phillips screw. Insert the plastic bracket on the left side, install and tighten the Phillips screw on the left side.
NOTE: The speaker will spring upward if constant pressure is not maintained during reinstallation until screws are reinstalled.
QTY MATERIAL 2 2.4 mm Phillips screw iPhone 4 CDMA
step Form The Cables Use the flat end of the plastic 51 Spudger to re-shape the LCD and digitizer flex cables prior to inserting the logic board. iPhone 4 CDMA
step Flex Bumper Ensure that the flex cable 52 bumper is installed on the logic board.
The bumper prevents the LCD cable from getting damaged or cut on the sharp edges of the logic board. iPhone 4 CDMA
step Insert Logic Board Insert the square tab at the 53 top of the logic board into the cut shelf of the iPhone frame at about a 30-degree angle.
Gently lay the logic board flat, making sure none of the flex cables are in the way. iPhone 4 CDMA
step Three Logic Board Screws 1. Use a 1,8x40 flat head 54 screwdriver to install the three standoff screws beginning with the top, center, and then the bottom. 2.
# QTY MATERIAL 1 1 4.8 mm Standoff screw 2 2 3.6 mm Standoff screw
2. iPhone 4 CDMA
step Grounding Clip Set the rear-facing camera 55 grounding clip in place. The rear-facing camera grounding clip arm should face out to the left when installed correctly. Insert and tighten the single Phillips screw with a #00 Phillips screwdriver.
Replace the sticker removed during the disassembly back over the screw.
QTY MATERIAL 1 2.5 mm Phillips screw iPhone 4 CDMA
step One Logic Board Screw Remove the single Phillips 56 head screw from the lower left side of the logic board just above the vibrator motor.
QTY MATERIAL 1 3.4 mm Phillips screw iPhone 4 CDMA
step Connect Antenna Flex Connect the Wi-Fi antenna 57 flex cable by pushing down until it “clicks” into place. iPhone 4 CDMA
step Insert Rear Camera Set the Rear-Facing Camera 58 in the upper left corner. Align and connect the rear- facing camera flex cable to the logic board. iPhone 4 CDMA
step Connect LCD Flex Align and connect the LCD 59 flex cable
Note: If a foam pad is not installed, transfer it from the original LCD assembly. iPhone 4 CDMA
step Connect Three Cables Align and connect the 60 digitizer flex cable into its appropriate connection slot.
Note: If a foam pad is not installed, transfer it from the original LCD assembly. iPhone 4 CDMA
step Connect Three Cables 1. Align and connect the front- 61 facing camera flex cable.
2. Connect the power/ proximity flex cable.
3. Align and connect the audio control flex cable. 1.
3. 2. iPhone 4 CDMA
step Place Charging Plate Route the cellular service 62 antenna around through the shield and connect to the button on the logic board.
Install the antenna retaining clip. Then insert and tighten the Phillips screw.
QTY MATERIAL 1 1.6 mm Phillips screw iPhone 4 CDMA
step Connect Charging Cable Align and connect the 63 charging port flex cable to the logic board. iPhone 4 CDMA
step Five EMI Screws Insert the Wi-Fi antenna 64 retaining plate. Install and tighten the Phillips screw.
NOTE: The “V” in the retaining plate goes into the body.
QTY MATERIAL 1 1.5 mm Phillips screw iPhone 4 CDMA
step Install EMI Shield Insert the two lower tabs of 65 the EMI shield into the shield cover. Then lay the shield flat and align the screw holes. iPhone 4 CDMA
step Five Screws 1. Install and tighten the five 66 2. Phillips screws holding the EMI shield in place.
3. 1.
# QTY MATERIAL 1 3 1.3 mm Phillips screw 2 1 1.5 mm Phillips screw 1. 3 1 2.4 mm Phillips screw iPhone 4 CDMA
step Connect Battery Set the charging port flex 67 cable retainer plate on top of the charging port flex cable.
Insert and tighten the two Phillips screws.
QTY MATERIAL 2 1.8 mm Phillips screw iPhone 4 CDMA
step Insert Battery Peel back the battery removal 68 tab and lay the battery back in place. iPhone 4 CDMA
step Insert Battery Align and connect the battery 69 back onto the connector located on the logic board.
Insert and tighten the single Phillips screw.
QTY MATERIAL 1 1.5 mm Phillips screw iPhone 4 CDMA
step Place Rear Glass 1. Place the rear cover on the 70 frame leaving about 2mm of space at the bottom of the phone.
2. Then slide the panel down toward the charging port. 2. 1. iPhone 4 CDMA
step Two Bottom Screws Install and tighten the two 71 Pentalobe screws.
QTY MATERIAL 2 3.6 mm Pentalobe screw iPhone 4 CDMA
step Test Device Power On the device and 72 test all functions using the Post-Repair Checklist.
NOTE: This checklist is signed by the customer verifying the condition of the device before and after the repair. The final check and signature will start the customers warranty based on the serial number of the device being inputted into the iTech app, which is located in Settings> General> About> Serial Number. iPhone 4 CDMA TROUBLESHOOTING
“Searching” is Displayed in Display Won’t Dim During Call iPhone Will Not Charge Upper Left Corner: • Install Proximity sensor isolation • The most common reason for an • Check date and time. If incorrect, foam between midframe and Digitizer iPhone not charging is dirt, lint or iPhone can not connect to carrier to • Check Power/Proximity cable for debris surrounding the 30 pin validate tear/damage charging port, keeping the charging • Check that the service antenna is cable from seating correctly properly plugged in Stuck in “No Service” Mode • Check the battery connector • Inspect the antenna for damage • Check that the charging port is • Check that the customer has a valid • Make sure the four tabs on the loud properly seated and open account speaker are properly tucked in and • Inspect battery flex cable for a tear • Make sure the cellular antenna touching the mid-frame is properly connected to the logic Home Button Not Working board • Means it is talking to the towers but • Home button Flex is likely damaged can not pull proper signal • Dock Connector flex cable is not properly seated iPhone 4 CDMA TROUBLESHOOTING
Lower Microphone Not Picking No Audio Input Via Speaker- Front Cam Shutter Won’t Open Up Sound: phone or Video Recording • Check that the front-facing camera • Check the microphone boot is in- • #1 cause is clogs in the hole in the cable is connected to the logic board. serted into the frame frame next to the headphone jack • Make sure the flex cable was not • Check to see if the microphone • Customer’s case could be covering punctured by the EMI shield. boot is pinched under the loud the upper microphone port • Inspect the logic board for damaged speaker • Check the headphone jack cable, or missing components. • Inspect the charging port cable to make sure it’s plugged in, inspect for see if the microphone is damaged tear or damage to cable “Connect to iTunes” Boot Rear Cam Shutter Won’t Open • Indication of major hardware failure • Inspect cables and battery for damage • Check that the rear-facing camera is • Check for water damage connected to the logic board • Call the SOS Helpline 1-855-442-7225 • Inspect the logic board for damaged or missing components