i put new trackpad and it worked. I then ran through usc (because there was some flux on board) and now fan spin is back? Please advise.

So many macbooks i work on just lose serial. just trying to make sense of it....

Hey guys,

i have a fully working 3115. only drama is fan goes 100% few seconds after turn on.
I checked fan connector and resistors...

This one also solved u9701 - my whole batch is %^#$&!
pulled from donor boards everything good!

hey solved was bad u9701

no luck with another lcd.

i changed u9701 still same i get 2.49v on lvds_bkl_pwm_rc...

3.3v on lcd_bklt_en 3.1 on bklt_en
lvds_bkl_pwm_rc is missing/very low ~100mv

i remove r9704 and run jumper from bklt_en to lvd_bkl_pwm_rc...

r9708/09 45/47k resistance
return resistors all have around .4v
pins 3-8 on j9000 also have .4 so i think traces good.
i will try another...

yes now i have image but still no backlight. i got two of these boards on my desk with same issue - hopefully when i solve one it will also fix the other....

u9701
2 = 2.5v
3 = 0v
4= 3.1v
5 = 0v
6 = 0v
7 = 0v
8 = 3.3v
9 = 0v
10 = 3.3v
11 = 3.3v...

no external (off hdmi)
i tried good known lcd.
Chime is present - both speakers are distorted!...

i ordered connectors for the time being. In the meantime i plug into charger and 20v with 0a.

oh. sucks if u dont have a donor board. any chance other connectors could work for this?

ah ok great explanation.

i have already tried good lcd assembly. i forgot to put in my previous post.

hey informaticos. i dont expect exact reading but expected reading should be closes to tolerance.

yes i do have image

I am not...

u4900 area look good. i tested resistors values around seem good. voltage 3.3 on 1, 5, 8

yep i got a good working shell so i just transplant the logicboard to eliminate keyboard/trackpad issue.

good thing is no smoke this time! still no backlight

UPDATE:

lcdbklt_en_l 11.72v
lcdbklt_en 0v
lcdbklt_en_div 11.9v...