Problems with black screen
A black screen on HTC EVO generally means that the LCD screen of the device is faulty, but there are other causes. First, a software problem can cause the screen to stop working. In this case, the screen probably works when you first turn on the EVO, but then stops working as charging device operating system. Moreover, EVO screen is connected to the control board by a cable if the cable is loose or broken, the screen appears as if defective.
reset
If the screen of your HTC EVO seems to work for a few seconds before switching off, then the problem is almost certainly your device software. To fix the problem you need to perform a hard reset, marked EVO software to its default factory settings. Performs reset by pressing the "Volume Down" key while the EVO is turned on. A boot menu appears on the screen, which should be working because the device has not loaded the operating system yet. Select the "Clear Memory" option to complete the hard reset and you see the screen working again. This process erases all information on your EVO.
Repair Tools and warnings
If the problem with the screen of your HTC EVO is not related to the software, you must open the device and repair or replace the LCD screen. Keep in mind that opening your EVO void the warranty and make you ineligible for a replacement device. In addition, repair the appliance yourself could also lead to new problems, even if the screen problem is solved. To open the EVO 4G will need a Phillips # 00 screwdriver a T5 screwdriver and pry tool.
Repair Procedure
Unmount the device, removing the six Torx screws on the back and then make lever and take the box to reveal the control board. Look at the two connectors on the left side of the plate to see if the wires are loose. If they are, place them again and reassemble the device to see if the problem was solved. If they are safe, free them and continuing the process of replacing the LCD screen. Remove the Phillips screw small in the upper right corner of the board, then remove the control board. Pry on the windscreen out of the device, leaving only the LCD assembly. Replace the screen and reassemble the device.
Replacing Devices
If you do not have the right to carry out repairs on the LCD or do not want to risk losing EVO warranty, contact your wireless service provider to request a replacement device tools. With a demonstrable problem as a blank LCD screen, you get a replacement, should not be a problem and only takes a few days.