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DS90UB949-Q1: flicker fault

Sherry Liang
Genius 10255 points
Part Number: DS90UB949-Q1

Dear team,

My customer feedbacks that there are 2pcs 949 flickering in their cluster MPed project. And they also did the ABA test, and the fault follows our 949. While our CQE team feedbacks that the unit pass ATE and bench in Santa Clara before. Below is the register dumped. The first is fault chip, and the second is good one.

https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/358_5F00_949_5F00_Registers_5F00_NG.nrdhttps://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/358_5F00_949_5F00_Registers_5F00_sample.nrd

The register comparison is as below. It seems that the main reason is these 2pcs 949 can't detect valid clock at HDMI input. I don't think the HDMI input has problems, otherwise all 949 can't detect the clock. Could you please give more debug ideas?

Address

Good unit

Return unit

Remark

0A

10

EA

CRC error

0C

07

03

 Valid clock not detected at HDMI input

1F

F7

00

Frequency counter

2B

A0

B8

Reserved

56

00

3F

Reserved

5A

CD

92

 good unit indicates dual mode while return unit indicates Single FPD-Link III Transmit on port 0.

5F

5D

00

HDMI Frequency

C5

38

00

Reserved

C7

00

60

ISR

Thanks & Best Regards,

Sherry

  • 0
    TI__Mastermind 37040 points

    Hi Sherry,

    Let me review and investigate this. I need to create some analysis slides, and I will get back with you by Monday.

    Aaron

  • 0 in reply to Aaron Heng
    TI__Genius 10255 points

    Hi Aaron,

    Thanks for your reply!

    These two days they also report another fault chip for the same project. The fault phenomenon is black screen when powers up. ABA follows our chip while ATE and Bench test is ok. The NG register and OK register are as below. In addition, their initial register configuration is as below. Compared with last flicker issue, the register dumped is a little different, but they all change dual mode to single mode with unknown reason.

    Address  Setting

    03            0xDA

    17            0xAE

    C6            0x21

    https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/949-registers.nrdhttps://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/138/OK_5F00_Registers.nrd

    Thanks & Best Regards,

    Sherry

  • 0 in reply to Sherry Liang
    TI__Mastermind 37040 points

    HI Sherry,

    Thank you for providing additional. I will add into the fishbone slides, and share with you.

    Aaron

  • 0 in reply to Aaron Heng
    TI__Mastermind 37040 points

    Hi Sherry,

    What is the deserializer connect to 949? By chance, do you have any deserializer register dump as well?

    Aaron