820-2309 No backligth

[maazkamani]

Hi

8.5v on pin 3 and 4 j9000
200k r9731
100k r9715

changed led driver. jumped a5 to diode

bkl_en is 2.5v. put 3.3v from pwm just to check if it works still nothing.

pwm is 3.3v

help?

 

[dukefawks]

I suspect a badly soldered chip or that A5 jumper is not working/shorting something out.