hello all dears,
I did every thing you said but did not work !!

here is the code i used :

Code:

cgminer.conf
***************************
"api-listen" : true,
"api-network" : true,
"api-groups" : "A:stats:pools:devs:summary:version",
"api-allow" : "A:0/0,W:*",
"--no-sensor-scan": true,
"bitmain-use-vil" : true,
"bitmain-work-mode" : "0",
"bitmain-freq" : "O",
"bitmain-voltage" : "1900"
*************************************

2019-08-31 06:41:17 power_api.c:37:_get_avg_voltage: chain = 0, voltage = 21.167373
2019-08-31 06:41:18 power_api.c:37:_get_avg_voltage: chain = 1, voltage = 21.136758
2019-08-31 06:41:20 power_api.c:37:_get_avg_voltage: chain = 2, voltage = 21.228603
2019-08-31 06:41:20 power_api.c:50:_get_avg_voltage: average_voltage = 21.177578
2019-08-31 06:41:20 power_api.c:68:check_voltage: target_vol = 21.00, actural_vol = 21.18, check voltage passed.
2019-08-31 06:41:20 uart.c:71:set_baud: set fpga_baud to 115200
2019-08-31 06:41:20 driver-hash-chip.c:233:dhash_chip_set_baud_v2: chain[0]: chip baud = 115200, chip_divider = 26
2019-08-31 06:41:20 driver-hash-chip.c:233:dhash_chip_set_baud_v2: chain[1]: chip baud = 115200, chip_divider = 26
2019-08-31 06:41:20 driver-hash-chip.c:233:dhash_chip_set_baud_v2: chain[2]: chip baud = 115200, chip_divider = 26
2019-08-31 06:41:33 driver-btm-api.c:1111:check_asic_number_with_power_on: Chain[0]: find 48 asic, times 0
2019-08-31 06:41:45 driver-btm-api.c:1111:check_asic_number_with_power_on: Chain[1]: find 48 asic, times 0
2019-08-31 06:41:56 driver-btm-api.c:1111:check_asic_number_with_power_on: Chain[2]: find 48 asic, times 0
2019-08-31 06:42:01 driver-btm-api.c:333:set_order_clock: chain[0]: set order clock, stragegy 3
2019-08-31 06:42:02 driver-btm-api.c:333:set_order_clock: chain[1]: set order clock, stragegy 3
2019-08-31 06:42:02 driver-btm-api.c:333:set_order_clock: chain[2]: set order clock, stragegy 3
2019-08-31 06:42:02 driver-hash-chip.c:490:set_clock_delay_control: core_data = 0x34
2019-08-31 06:42:02 voltage[0] = 1700
2019-08-31 06:42:02 voltage[1] = 1700
2019-08-31 06:42:02 voltage[2] = 1700
2019-08-31 06:42:02 power_api.c:214:set_working_voltage_raw: working_voltage_raw = 1700
2019-08-31 06:42:03 temperature.c:202:is_temp_sensor_type_correct: Wrong temp sensor type, chain = 0, sensor = 39, type = 0x0, retry.
2019-08-31 06:42:03 temperature.c:202:is_temp_sensor_type_correct: Wrong temp sensor type, chain = 0, sensor = 39, type = 0x0, retry.
2019-08-31 06:42:03 temperature.c:202:is_temp_sensor_type_correct: Wrong temp sensor type, chain = 0, sensor = 39, type = 0x0, retry.
2019-08-31 06:42:03 temperature.c:202:is_temp_sensor_type_correct: Wrong temp sensor type, chain = 0, sensor = 39, type = 0x0, retry.
2019-08-31 06:42:03 driver-btm-api.c:191:set_miner_status: ERROR_TEMP_LOST_1ST
2019-08-31 06:42:03 driver-btm-api.c:145:stop_mining_and_reboot: stop mining: Re-run cgminer to check temerature sensor type again!
2019-08-31 06:42:03 thread.c:698:cancel_read_nonce_reg_thread: cancel thread
2019-08-31 06:42:03 driver-btm-api.c:118:killall_hashboard: ****power off hashboard****
2019-08-31 06:42:08

Assert fail!! driver-btm-api.c:150: reboot