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TI device : SN75DP120 (DP to VGA issue)

kerr chang
Genius 4075 points
Other Parts Discussed in Thread: SN75DP120

Hi I have use TI DP120 in my system. I have test DP function and DP to HDMI/DVI and Function is pass. but when I use DP to VGA device , we can not get output. (DP to VGA chip : NXP PTN3392) I have try to remove DP120 and short singel trace , and DP to VGA function can PASS. How to debug this issue in my system?
DTR_Cradle_DP_Circuit.pdf