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DS90UB926Q-Q1: the Display has no image

Kailyn Chen
Genius 9560 points
Part Number: DS90UB926Q-Q1

Hello,

Serializer:DS90UB941.

Deserializer: DS90UB926. 

LCD: RGB 800*480

Now the UB926 has output, D_CLK: 27M, DE: 23 KHZ , RGB:26 KHZ, but the LCD has no image.

The register  of UB941is as following, and the 926 has been lock:

0x01 0x8

0x04 0x10

0x5B 0x01
0x4F 0x8C
0x1E 0x01

0x56 0x00

0x03 0x9A

0x40 0x04
0x41 0x05
0x42 0x1A

0x40 0x04
0x41 0x20
0x42 0x6F

0x40 0x04
0x41 0x30
0x42 0x0
0x40 0x04
0x41 0x31
0x42 0x14

0x40 0x04
0x41 0x32
0x42 0x0
0x40 0x04
0x41 0x33
0x42 0x1E

0x65 0x00

0x12 0x20

0x66 0x1A
0x67 0x01
0x66 0x03
0x67 0x07

0x66 0x07
0x67 0x20
0x66 0x08
0x67 0x03
0x66 0x09
0x67 0x1E

0x66 0x04
0x67 0x68
0x66 0x05
0x67 0x83
0x66 0x06
0x67 0x20

0x66 0x0C
0x67 0x1A
0x66 0x0D
0x67 0x05
0x66 0x0A
0x67 0x14
0x66 0x0B
0x67 0x1E

0x66 0x0e
0x67 0x03

0x65 0x03
0x64 0x11

0x01 0x00

  • 0
    TI__Mastermind 27645 points

    Hi Kailyn,

    Has this setup already been verified with patgen and/or internal timing? The black screen is most likely the result of incorrect DSI setup.

    Could you report back the values of these registers?

    • 0x2A (DSI_VC_DTYPE)
      • Check in DSI Port 0 indirect registers
    • 0x5F (DSI_FREQ)

    I am attaching the DS90UB941AS DSI bringup guide if you do not have it already.

    DSI bringup guide

    Regards,

    Jack