ADV7511W all registers read 0x13,why?

Question

hi, i have a problem,when i write adv7511w by i2c with address 0x72,it seems to be normal,but when i read from adv7511w,all registers eq 0x13,i dont know why? 
 
 and,i find many users have faced this problem,so,how to fix it?

i'm sure the hpd pull high ,and my schematic as follows:

PoornimaSubramani · Accepted Answer

Hi, 
 To power up the part,the the Power Down register bit (0x41[6]) must be written to 0 when the HPD pin is high. When HPD goes from high to low, some registers will be reset to their defaults. 
 For more details,Please refer 4.2.1 register configuration section in ADV7511W programming guide. 
 
 Thanks, 
 Poornima)

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ADV7511W all registers read 0x13,why?