Then adjust the brightness scale to your liking.  Moving right increases brightness (towards large and bold icon) and moving left reduces it (towards small icon.)

b.if adjust still very dark ,then try to install the lcd to another phone ,if still dark ,then maybe lcd quality issue (suggest you choose better brightness lcds like Bizbee NCC ESR LCDS)

2.The Screen too yellow

a.check if Night Shift on or not ,if yes ,then turn off 

b,if still yellow ,adjust color filter under system higher than IOS 10

c ,if still not good ,try to install the lcd to another phone and recheck ,if not work,means the lcd itself dark ,suggest you buy lcds 6500k-7500K like NCC ESR LCD.if become brightness ,means the mainboard influence the color ,not fixable 

3.The screen too blue
similar like too yellow ,but blue is not the issue of night shift mode

to make you more easy to understand ,i make a process map for you ,very easy for you to do troubleshootings step by step(give me a reply to get the most 10 hotest process map when phone repair)

and now let us back to today  main question:

how to get a nice lcds that customer never complain color?

here is 4ways help you

1.choose high brightness like ESR or more better NCC ESR
( original brightness is 500cd/m2 and our ncc is 480cd/m2，the most brightness close to original and we are still improving the brightness
,see below picture)

 

2.choose lcds more close to original color temperation
(Original one is 5500-5800k and ncc is 5500k -6500K and D65 standard，almost same as original ones)

3.choose good competitive lcds
(NCC can help  you save 60-80% cost in original lcds parts,and only 1usd higher than normal lcds ,
why not choose it ?)

(please contact me for the discount price for your reference )

4. choose a supplier who is always keep on moving and innovating
After 6 months research ,Bizbee develop out the Best high copy lcds ,keep moving and reduce faulty rate and provide a better and better
parts is our goal