Bricked phone symptoms: - can't power on after flash,
- no lcd or led reaction for power button,
- no lcd or led reaction for charger,
- no lcd or led reaction if phone is connected to PC,
- your PC can't detect your phone with vol-,
- phone does not vibrate when holding vol+ and power together.
Repair steps: Test mode point Posted By NikkyM 
Firstly connect turned off bricked phone to your PC. If phone will be detected in device manager as: You are lucky and this is the end of the first step for you. Just disconnect phone. If your phone can't be detected at all, you must find testpoint. Disassemble your phone remove battery and connect each golden point on main board one by one to metal shield and attach usb cable. If your phone will be detected in device manager as flash device or something like that you've found testpoint. Don't forget to take a picture of main board and mark testpoint nd post here Download All FilesHere Download and run this s1tool: Download boot firmware for your Sony Xperia SP (extract it from rar): In S1tool choose S1 EMERGENCY mode, press Flash button, select Sony Xperia SP boot firmware .sin_file_set file, Press Testpoint READY button and if your phone is detected as qhusb_dload device, just attach usb cable. If not, perform all steps from point 3 (connect testpoint to GND and attach USB cable). When drivers will be installed and phone will be detected, program will ask you to disconnect testpoint. Disconnect testpoint from GND and press Testpoint READY button. After that phone will load emergency s1 loader, re-enumerate usb, load s1 loader and flash selected boot firmware.
Welcome to S1 tool.
That is small and crippled subset of SETOOL2 service tool.
SELECT FIRMWARE PACKAGES
YOU CAN SELECT SEVERAL PACKAGES WITH CTRL BUTTON
CHECKING PACKAGES ...
DETACH USB CABLE FROM PHONE
REMOVE BATTERY FROM PHONE
ATTACH TESTPOINT
PRESS "READY", THEN ATTACH USB CABLE TO PHONE
will use DLOAD protocol ...
0808010600900000
0D0F50424C5F446C6F6164564552322E30
162001000100
17004001000100E1507E00
PRODUCT DETECTED: "SONY MSM8960-3 Pro OEM1 Fused"
1801000F43240892D02F0DC96313C81351B40FD5029ED98FF9 EC7074DDAE8B05CDC8E1
PROCESSING ...
REMOVE TESTPOINT NOW, THEN PRESS "READY"
Emergency loader uploaded ...
RUNNING S1_PRELOADER VER "R5G008"
LOADER AID: 0001
DEVICE ID: 2078EB03
FLASH ID: "00FE/004E003F"
LOADER VERSION: "R5G008"
WRITING PACKAGES ...
Processing package
C:\Users\Administrator\Desktop\S1Boot_R11B023_HWID 7E50E1.SIN_FILE_SET
Processing ACPU files
PROCESSING: boot.sin
no update files in package
FINISHED
Elapsed:29 secs.
After Repair Done Flash vit firmware.
Source:sony.yt PLEASE DON'T SAY THANKS
JUST PRESS BUTTON 
BUTTON 