820-2936 no bklt

[nate8organic]

have an 820-2936 showing data but no bklt. im getting 12.4v on ppvout_sw_lcdbklt if i understand correctly i need 30v here? either way im getting 3.2v on bklt_en, i wired q9707 to r9704 and no backlight so im assuming my troubles are after the u9701?.

Thanks
nate

 

[nate8organic]

okay i clearly understand now. miss understanding there hahaha! sorry.

tested blk_pwm @ 3.2v
smc_lid @3.4v

Pin 1 on the

i also just pulled the lvdc cable wile still power in ) not paying attention! replaced the L9008. seems like no data still. what would i have fried doing this?
ah just love fucking things up worse hahah

 

[larossmann]

You didn't tell me what BKL_EN is. If BKL_EN is 2.7v or greater, then bad LED driver or the feedback trace is gone on ball A5 of U9701. If BKL_EN is 0v or 0.02v or something low, then figure out why that is(bad R9715/R9731/trace to those resistors is blown).

 

[nate8organic]

okay so i mixed up 2 boards. the last board i thought i messed up data but it was wrong board. So i tested the board. bklt_pwm @3v
smc_lid @3.4v
Bklt_en @3.2v after i changed out the r9715 & r9713 before i replaced them it was jumping around 300.

still no backlight though. where is the led driver? i search in the schematics but only found info on it under battery. sorry for my lack of knowledge/ understanding here.
And thanks for taking the time to help me!