DS90UB947-Q1: Reversing camera White noise problem

Hi Sam,

• How did you isolate this issue to 947?
• Can you confirm that you have done ABA swap?
• Basically put the suspect 947 IC on a known good board and put a known good 947 IC on the suspect board?
• If yes, what were the results ?
• Can you confirm that issue gets worse at cold temp and better at hot temp?
• However when you heat up the system and then cool it down to room temp, issue goes away?
• Issue only happens at room temperature and when temperature ramp up to hot temp but no issue when temp ramp down to cold temp ?
• On the "suspect" units have you tried running internal patgen testing from 947 to see if any issue still present on the display? This method is good for isolation 
• Can you provide a register dump of DS90UB947 for a known good system vs. bad system?
• How old is this application?
• Are all these production failures?
• Can you send me a clear image of the pull-up and pull-down network for Mode_sel0/1 also what modes are you intending to use here?

Values aren't clear 

INTB and SDA/SCL require pull up resistors

Each pair requires external 100-Ω differential termination for standard LVDS levels

Can you please capture your power-up sequence on the scope to show VDDIO/VDD18/VDD11/PDB/OLDI start-up order and timing as described in datasheet section 9.1

Important - please confirm you are writing this code to 947 after power-supply/PDB is stable and after you apply OLDI input?

Internal Patgen testing using Analog LaunchPad software for TI

You can choose timing source as internal or internal with external timing or you can do all external - It's recommended to check all 3 modes and report the results back and choose spec resolution or can use custom resolution then enable generator and you can either choose fixed pattern or can choose color bars