I9505 repair

pls can any one help me i cant repair an I9505
Open serial port…OK
Connecting to the RIFF Box…OK
Firmware Version: 1.37, JTAG Manager Version: 1.56
Selected Resurrector: [Samsung I9505 V1.0.5194.48172]

Connecting to the dead body…OK
Detected dead body ID: 0x2071B0E1 – CORRECT!
Set I/O Voltage reads as 1.79V, TCK Frequency is 8 MHz

Resurrection sequence started.
Establish communication with the phone…OK
Initializing internal hardware configuration…OK
Uploading resurrector data into memory…OK
Starting communication with resurrector…FAILED
ERROR: No response from the RIFF Box.
wher is the probleme pls ?????