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Linux/DS90UB928Q-Q1: ds90ub928 output black level image,it can not decode video from ds90ub927

user5140192
Prodigy 90 points
Part Number: DS90UB928Q-Q1

Tool/software: Linux

we use ds90ub927&ds90ub928,sometime the ds90ub928 output black level video,it can not decode the video from ds90ub927,we try to reset the ds90ub928 through write ds90ub928 reset register ,the ds90ub928 can decode the video from ds90ub927.

when the problem happened,we can measue the clock and one pair of data from ds90ub928,but the panel is black,we compare the data signal with black level data ,they are the same.

we try to let ds90ub928 output pattern ,it worked.

when the problem happened ,the control path always works(i2c) without any problem.

we also checked the BITS ／OEN/OEN_SEL/ control pin & register ,it was the same as normal.

Is there any idea about what happened,how we can resolve the problem?

  • 0
    TI__Mastermind 30515 points
    Hi,
    please check the section 9.3 on AV Mute, which would cause the black if your video has some special data in blanking. You can try to setthe gate DE Register 0x04[4] on the serializer to prevent it.


    9.3 AV Mute Prevention
    The DS90UB928Q-Q1 may inadvertently enter the AV MUTE state if the serializer sends video data during
    blanking period (DE = L) with a specific data pattern (24’h666666). Once the device enters the AV MUTE state,
    the device mutes both audio and video outputs resulting in a black display screen. Setting the gate DE Register
    0x04[4] on the serializer will prevent video signals from being sent during the blanking interval. This will ensure
    AV MUTE mode is not entered during normal operation.
    If unexpected AV MUTE state is seen, it is recommended to verify checking the data path control setting of the
    paired Serializer. This setting is not accessible from DS90UB928Q-Q1.

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 90 points
    we check the serilizer 0x04[bit 4]　gate DE　to 0x90 ,but 928 sometimes also output black screen,is there any other idea?
    we check the data path control register of ds90ub927,we set 0x12: 0x00 ,0x1a: 0x00
  • 0 in reply to user5140192
    TI__Mastermind 30515 points
    Is it possible to measure the UB927 input data from processor? does it have any issue?

    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 90 points
    we measure the UB927 input data from processor,it keep normally.
  • 0 in reply to user5140192
    TI__Mastermind 30515 points
    1. pls provide the black video's data that you capture?
    2. you can dump the register of UB927 for analysis when you met black display issue.

    best regards,
    Steven
  • 0 in reply to Steven(Shenzhen) Shi
    Prodigy 90 points
    the below is 928 ok register dump
    
    v_interface # cat ds90ub928_read
    ]ds90ub927q_read - read i2c device 0x2c reg 0x02
    ]read 928 register 0x 2: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x03
    ]read 928 register 0x 3: 0xf8
    ]ds90ub927q_read - read i2c device 0x2c reg 0x04
    ]read 928 register 0x 4: 0xfe
    ]ds90ub927q_read - read i2c device 0x2c reg 0x05
    ]read 928 register 0x 5: 0x1e
    ]ds90ub927q_read - read i2c device 0x2c reg 0x06
    ]read 928 register 0x 6: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x07
    ]read 928 register 0x 7: 0x18
    ]ds90ub927q_read - read i2c device 0x2c reg 0x08
    ]read 928 register 0x 8: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x09
    ]read 928 register 0x 9: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0a
    ]read 928 register 0x a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0b
    ]read 928 register 0x b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0c
    ]read 928 register 0x c: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0d
    ]read 928 register 0x d: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0e
    ]read 928 register 0x e: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0f
    ]read 928 register 0x f: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x10
    ]read 928 register 0x10: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x11
    ]read 928 register 0x11: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x12
    ]read 928 register 0x12: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x13
    ]read 928 register 0x13: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x14
    ]read 928 register 0x14: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x15
    ]read 928 register 0x15: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x16
    ]read 928 register 0x16: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x17
    ]read 928 register 0x17: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x18
    ]read 928 register 0x18: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x19
    ]read 928 register 0x19: 0x01
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1a
    ]read 928 register 0x1a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1b
    ]read 928 register 0x1b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1c
    ]read 928 register 0x1c: 0x03
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1d
    ]read 928 register 0x1d: 0x2b
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1e
    ]read 928 register 0x1e: 0x39
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1f
    ]read 928 register 0x1f: 0x0d
    ]ds90ub927q_read - read i2c device 0x2c reg 0x20
    ]read 928 register 0x20: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x21
    ]read 928 register 0x21: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x22
    ]read 928 register 0x22: 0x40
    ]ds90ub927q_read - read i2c device 0x2c reg 0x23
    ]read 928 register 0x23: 0x10
    ]ds90ub927q_read - read i2c device 0x2c reg 0x24
    ]read 928 register 0x24: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x25
    ]read 928 register 0x25: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x26
    ]read 928 register 0x26: 0x83
    ]ds90ub927q_read - read i2c device 0x2c reg 0x27
    ]read 928 register 0x27: 0x84
    ]ds90ub927q_read - read i2c device 0x2c reg 0x28
    ]read 928 register 0x28: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x29
    ]read 928 register 0x29: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x2a
    ]read 928 register 0x2a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x2b
    ]read 928 register 0x2b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x35
    ]read 928 register 0x35: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x35
    ]read 928 register 0x35: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x39
    ]read 928 register 0x39: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x3a
    ]read 928 register 0x3a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x3b
    ]read 928 register 0x3b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x41
    ]read 928 register 0x41: 0x03
    ]ds90ub927q_read - read i2c device 0x2c reg 0x44
    ]read 928 register 0x44: 0x60
    ]ds90ub927q_read - read i2c device 0x2c reg 0x45
    ]read 928 register 0x45: 0x88
    ]ds90ub927q_read - read i2c device 0x2c reg 0x49
    ]read 928 register 0x49: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x4b
    ]read 928 register 0x4b: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x56
    ]read 928 register 0x56: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x64
    ]read 928 register 0x64: 0x10
    ]ds90ub927q_read - read i2c device 0x2c reg 0x65
    ]read 928 register 0x65: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x66
    ]read 928 register 0x66: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x67
    ]read 928 register 0x67: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x6e
    ]read 928 register 0x6e: 0x01
    ]ds90ub927q_read - read i2c device 0x2c reg 0x6f
    ]read 928 register 0x6f: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x02
    ]read register 927 0x 2: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x03
    ]read register 927 0x 3: 0xda
    ]ds90ub927q_read - read i2c device 0x0c reg 0x04
    ]read register 927 0x 4: 0x80
    ]ds90ub927q_read - read i2c device 0x0c reg 0x05
    ]read register 927 0x 5: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x06
    ]read register 927 0x 6: 0x58
    ]ds90ub927q_read - read i2c device 0x0c reg 0x07
    ]read register 927 0x 7: 0x38
    ]ds90ub927q_read - read i2c device 0x0c reg 0x08
    ]read register 927 0x 8: 0x38
    ]ds90ub927q_read - read i2c device 0x0c reg 0x09
    ]read register 927 0x 9: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0a
    ]read register 927 0x a: 0x02
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0b
    ]read register 927 0x b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0c
    ]read register 927 0x c: 0x07
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0d
    ]read register 927 0x d: 0x25
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0e
    ]read register 927 0x e: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0f
    ]read register 927 0x f: 0x0b
    ]ds90ub927q_read - read i2c device 0x0c reg 0x10
    ]read register 927 0x10: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x11
    ]read register 927 0x11: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x12
    ]read register 927 0x12: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x13
    ]read register 927 0x13: 0x10
    ]ds90ub927q_read - read i2c device 0x0c reg 0x14
    ]read register 927 0x14: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x15
    ]read register 927 0x15: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x16
    ]read register 927 0x16: 0xfe
    ]ds90ub927q_read - read i2c device 0x0c reg 0x17
    ]read register 927 0x17: 0x9e
    ]ds90ub927q_read - read i2c device 0x0c reg 0x18
    ]read register 927 0x18: 0xa1
    ]ds90ub927q_read - read i2c device 0x0c reg 0x19
    ]read register 927 0x19: 0xa5
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1a
    ]read register 927 0x1a: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1b
    ]read register 927 0x1b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1c
    ]read register 927 0x1c: 0x0e
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1d
    ]read register 927 0x1d: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1e
    ]read register 927 0x1e: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1f
    ]read register 927 0x1f: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x20
    ]read register 927 0x20: 0x03
    ]ds90ub927q_read - read i2c device 0x0c reg 0x64
    ]read register 927 0x64x: 0x10
    ]ds90ub927q_read - read i2c device 0x0c reg 0x65
    ]read register 927 0x65x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x66
    ]read register 927 0x66x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x67
    ]read register 927 0x67x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x70
    ]read register 927 0x70: 0x5d
    ]ds90ub927q_read - read i2c device 0x0c reg 0x71
    ]read register 927 0x71: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x72
    ]read register 927 0x72: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x73
    ]read register 927 0x73: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x74
    ]read register 927 0x74: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x75
    ]read register 927 0x75: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x76
    ]read register 927 0x76: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x77
    ]read register 927 0x77: 0x5d
    ]ds90ub927q_read - read i2c device 0x0c reg 0x78
    ]read register 927 0x78: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x79
    ]read register 927 0x79: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7a
    ]read register 927 0x7a: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7b
    ]read register 927 0x7b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7c
    ]read register 927 0x7c: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7d
    ]read register 927 0x7d: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0xc6
    ]read register 927 0xc6: 0x21
    ]ds90ub927q_read - read i2c device 0x0c reg 0xc7
    ]read register 927 0xc7: 0x00




    the below is NG register dump
    /sys/priv_interface # cat ds90ub928_read
    ]ds90ub927q_read - read i2c device 0x2c reg 0x02
    ]read 928 register 0x 2: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x03
    ]read 928 register 0x 3: 0xf8
    ]ds90ub927q_read - read i2c device 0x2c reg 0x04
    ]read 928 register 0x 4: 0xfe
    ]ds90ub927q_read - read i2c device 0x2c reg 0x05
    ]read 928 register 0x 5: 0x1e
    ]ds90ub927q_read - read i2c device 0x2c reg 0x06
    ]read 928 register 0x 6: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x07
    ]read 928 register 0x 7: 0x18
    ]ds90ub927q_read - read i2c device 0x2c reg 0x08
    ]read 928 register 0x 8: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x09
    ]read 928 register 0x 9: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0a
    ]read 928 register 0x a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0b
    ]read 928 register 0x b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0c
    ]read 928 register 0x c: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0d
    ]read 928 register 0x d: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0e
    ]read 928 register 0x e: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x0f
    ]read 928 register 0x f: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x10
    ]read 928 register 0x10: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x11
    ]read 928 register 0x11: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x12
    ]read 928 register 0x12: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x13
    ]read 928 register 0x13: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x14
    ]read 928 register 0x14: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x15
    ]read 928 register 0x15: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x16
    ]read 928 register 0x16: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x17
    ]read 928 register 0x17: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x18
    ]read 928 register 0x18: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x19
    ]read 928 register 0x19: 0x01
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1a
    ]read 928 register 0x1a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1b
    ]read 928 register 0x1b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1c
    ]read 928 register 0x1c: 0x03
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1d
    ]read 928 register 0x1d: 0x2b
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1e
    ]read 928 register 0x1e: 0x39
    ]ds90ub927q_read - read i2c device 0x2c reg 0x1f
    ]read 928 register 0x1f: 0x0d
    ]ds90ub927q_read - read i2c device 0x2c reg 0x20
    ]read 928 register 0x20: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x21
    ]read 928 register 0x21: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x22
    ]read 928 register 0x22: 0x40
    ]ds90ub927q_read - read i2c device 0x2c reg 0x23
    ]read 928 register 0x23: 0x10
    ]ds90ub927q_read - read i2c device 0x2c reg 0x24
    ]read 928 register 0x24: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x25
    ]read 928 register 0x25: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x26
    ]read 928 register 0x26: 0x83
    ]ds90ub927q_read - read i2c device 0x2c reg 0x27
    ]read 928 register 0x27: 0x84
    ]ds90ub927q_read - read i2c device 0x2c reg 0x28
    ]read 928 register 0x28: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x29
    ]read 928 register 0x29: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x2a
    ]read 928 register 0x2a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x2b
    ]read 928 register 0x2b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x35
    ]read 928 register 0x35: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x35
    ]read 928 register 0x35: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x39
    ]read 928 register 0x39: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x3a
    ]read 928 register 0x3a: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x3b
    ]read 928 register 0x3b: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x41
    ]read 928 register 0x41: 0x03
    ]ds90ub927q_read - read i2c device 0x2c reg 0x44
    ]read 928 register 0x44: 0x60
    ]ds90ub927q_read - read i2c device 0x2c reg 0x45
    ]read 928 register 0x45: 0x88
    ]ds90ub927q_read - read i2c device 0x2c reg 0x49
    ]read 928 register 0x49: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x4b
    ]read 928 register 0x4b: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x56
    ]read 928 register 0x56: 0x08
    ]ds90ub927q_read - read i2c device 0x2c reg 0x64
    ]read 928 register 0x64: 0x10
    ]ds90ub927q_read - read i2c device 0x2c reg 0x65
    ]read 928 register 0x65: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x66
    ]read 928 register 0x66: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x67
    ]read 928 register 0x67: 0x00
    ]ds90ub927q_read - read i2c device 0x2c reg 0x6e
    ]read 928 register 0x6e: 0x01
    ]ds90ub927q_read - read i2c device 0x2c reg 0x6f
    ]read 928 register 0x6f: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x02
    ]read register 927 0x 2: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x03
    ]read register 927 0x 3: 0xda
    ]ds90ub927q_read - read i2c device 0x0c reg 0x04
    ]read register 927 0x 4: 0x80
    ]ds90ub927q_read - read i2c device 0x0c reg 0x05
    ]read register 927 0x 5: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x06
    ]read register 927 0x 6: 0x58
    ]ds90ub927q_read - read i2c device 0x0c reg 0x07
    ]read register 927 0x 7: 0x38
    ]ds90ub927q_read - read i2c device 0x0c reg 0x08
    ]read register 927 0x 8: 0x38
    ]ds90ub927q_read - read i2c device 0x0c reg 0x09
    ]read register 927 0x 9: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0a
    ]read register 927 0x a: 0x02
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0b
    ]read register 927 0x b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0c
    ]read register 927 0x c: 0x07
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0d
    ]read register 927 0x d: 0x25
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0e
    ]read register 927 0x e: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x0f
    ]read register 927 0x f: 0x0b
    ]ds90ub927q_read - read i2c device 0x0c reg 0x10
    ]read register 927 0x10: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x11
    ]read register 927 0x11: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x12
    ]read register 927 0x12: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x13
    ]read register 927 0x13: 0x10
    ]ds90ub927q_read - read i2c device 0x0c reg 0x14
    ]read register 927 0x14: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x15
    ]read register 927 0x15: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x16
    ]read register 927 0x16: 0xfe
    ]ds90ub927q_read - read i2c device 0x0c reg 0x17
    ]read register 927 0x17: 0x9e
    ]ds90ub927q_read - read i2c device 0x0c reg 0x18
    ]read register 927 0x18: 0xa1
    ]ds90ub927q_read - read i2c device 0x0c reg 0x19
    ]read register 927 0x19: 0xa5
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1a
    ]read register 927 0x1a: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1b
    ]read register 927 0x1b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1c
    ]read register 927 0x1c: 0x0e
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1d
    ]read register 927 0x1d: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1e
    ]read register 927 0x1e: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x1f
    ]read register 927 0x1f: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x20
    ]read register 927 0x20: 0x03
    ]ds90ub927q_read - read i2c device 0x0c reg 0x64
    ]read register 927 0x64x: 0x10
    ]ds90ub927q_read - read i2c device 0x0c reg 0x65
    ]read register 927 0x65x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x66
    ]read register 927 0x66x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x67
    ]read register 927 0x67x: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x70
    ]read register 927 0x70: 0x5d
    ]ds90ub927q_read - read i2c device 0x0c reg 0x71
    ]read register 927 0x71: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x72
    ]read register 927 0x72: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x73
    ]read register 927 0x73: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x74
    ]read register 927 0x74: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x75
    ]read register 927 0x75: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x76
    ]read register 927 0x76: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x77
    ]read register 927 0x77: 0x5d
    ]ds90ub927q_read - read i2c device 0x0c reg 0x78
    ]read register 927 0x78: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x79
    ]read register 927 0x79: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7a
    ]read register 927 0x7a: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7b
    ]read register 927 0x7b: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7c
    ]read register 927 0x7c: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0x7d
    ]read register 927 0x7d: 0x00
    ]ds90ub927q_read - read i2c device 0x0c reg 0xc6
    ]read register 927 0xc6: 0x21
    ]ds90ub927q_read - read i2c device 0x0c reg 0xc7
    ]read register 927 0xc7: 0x00
    dress
  • 0 in reply to user5140192
    TI__Mastermind 30515 points
    Hi,
    when the display panel is black, only clock and 1 LVDS data have output, the other 3 LVDS data channel has NO output? does the UB928 LOCK pin is high or low?

    best regards,
    Steven