Tip & How-To about Miscellaneous

Slove iPhone 6 displays black screen and high-current

Trouble Phenomenon
IPhone 6 displays black screen and DC power shows the current flows normally but a little higher than that of average working iPhones.
Repair Process
Teardown iPhone and measure the diode data of each pin of display screen interfaces. The data is normal. There is no output after measuring the display power supply ±5.7v voltage. Replace the display screen power chip U1505, but the same problem still shows up. Therefore, we conclude there is something wrong with the surrounding circuits' resistor-capacitor units. After carefully measurement we find capacitor C1554 is short circuit. The location of capacitor C1554 is shown in bitmap picture 2-3 and material object is shown in picture 2-4. Replace it, the ±5.7v voltage output is normal. Assemble motherboard and turn on iPhone, the screen displays normally. Trouble is removed.
That the voltage of capacitor C1554 is under 5.7v suggests the damage of Touch IC chip or low starting conditions.
Picture 2-3
Picture 2-4
DPS series digital input adjustable DC power supply 0 30V 0 5A 110V 220V...

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how do i fix my iphone 3g thatb willm only power on and off and will only display the apple logo on a completely black screen and constantly blinks on and off when turned on

This is probably too late but I really hope this can help you or others.
1,Possible Reasons for your iPhone's Black Screen of *****
A. Hardware Damage
B. Failed Software Update
2,Common Ways to Fix the Black Screen issue in your iPhone.
A. Perform a Hard Reset on your iPhone.
B. Restore Factory Settings using iTunes
3,Best Solution: Fixing your iPhone's Black Screen issue with FoneDog
Step 1: Launch and connect.
Step 2: Detect the Affected iPhone Device.
Step 3: Proceed to the System Recovery Process.
Step 4: Download the Firmware.
Step 5: Perform Another Option for Firmware Download.
Step 6: Repair in Progress.
Step 7: Turn on the Device after Repair.

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1 Answer

white screen on the iphone 3g

It's not 10 seconds. Hold down the home and the power button for about 15-30 seconds till the screen goes black. You will notice little lines in the screen, which is totally normal. Keep holding till the apple logo shows back up..

If it does not. Then your screen is probably out.

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Hi, did the phone fall on the flow or hit something? If yes, that might have been the cause of the dim display. Cause the screen has been affected and you will need to replace the screen.

After dim display, if the phone blinks or show some funny moving display, that means is the flex that connects the front screen board to the main board of the phone that is faulty and it will need to be replaced.

Take care.

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Does your phone have enough battery power? If it so and still doesn't show a display when you turn it on then bring your phone to the nearest cellphone repair center in your place and ask them to repair your phone. This kind of problem is on the LCD display and it should be handle by a technician to get it repaired.

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Check for broken LCD inside your iPhone. Other thing it might be loose connection between LCD and its socket. Here is disassembly guide for your iPhone

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