rtl8156b schematic about rtl8156-vl822-fe2.1-open-pcb

[gamefunc]

schematic: no, it needs take it from agent;

Then 
your description is too abstract, not know you are a consumer or a designer;
if you are a consumer:     
    please ask the seller;    
if you are a designer:     
    you can refer my pcb design, 
    because is a successful case:    
        https://oshwhub.com/gamefunc/rtl8156-vl822-fe2.1-quan-yan-zheng-wan-bi   
verify video:     
    https://www.bilibili.com/video/BV1ZY4y1N7tZ/    
    https://www.bilibili.com/video/BV1h8411b7DR/    

a PCB problem, you can only troubleshoot it yourself;     
with only your description, possibility could fill many books;   
wire, voltage, parts, diff, impedance, etc etc...    
if no success cases:
    you need adventure;     
if have successful cases:
    just reverse troubleshooting;