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[SOLVED]820-4924 backlight headache
- Thread starter laptopcity
- Start date
laptopcity
Member
yes voltage still 12.2v on lcd connector , 0v on EDP_BKLT_PWM pin 8 of lcd connector and 0v everwhere else for that signal , is it pssible to run a wire from l8300 for the 5v or am i gonna blow the board
laptopcity
Member
yes i used another customers board to check this screen and also my test screen and both were working , unless ive managed to blow both these screens but this board has now gone so i cant recheck the screens i have, i have rechecked the board and now im getting 1.47v at EDP_BKLT_PWM pin 8 of lcd connector, still 12.2v at pin 1
laptopcity
Member
without lcd connected the readings are:
pin1=0.519
pin2=ol
pin3=0.543
pin4=0.543
pin5=0.669
pin6=0.757
pin7=0.758
pin8=0.705
pin9=0.808
pin10=0.559
pin1=0.519
pin2=ol
pin3=0.543
pin4=0.543
pin5=0.669
pin6=0.757
pin7=0.758
pin8=0.705
pin9=0.808
pin10=0.559
laptopcity
Member
its was an a1502 serial number c02qjtcefvh3 which ive just looked up again and should be 2015
laptopcity
Member
Duke thankyou for your patience you put me in the right direction with the broken trace on the i2c_bklt_sda line which if i had done as i replied back to you with what i done ie pin 4 of the lcd then i would have saved myself hours of frustration, like a prize pratt i soldered it to pin 3 of the lcd connector, this week i have learnt alot about the backlight circuit and it reminded me why this site is worth every penny, thankyou and to aprendiz too 