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thanks, i need more time

SMC bypass mode start it for few seconds and stop fan spinning. yes, Pulse at the big coils. PM_SLP_S4_L signal pulses triggering SMC_ONOFF_L ,Yes pulse is ther for short period. corrosion around U1950 and U6100.Yes.

It was drinks damaged.After connected power orange light buy not turn on.Sometimes it turn on and few minuites later turn off again. PPBUS_G3H = 8.58v PPBUS_S5_HS_COMPUTING_ISNS = 8.5v PPBUS_S5_HS_OTHER_ISNS = 8.5v PPDCIN_G3H_ISOL = 16.6v PPDCIN_G3H = 16.6v PP3V42_G3H = 3.42v PPVRTC_G3H = 3.32v...

Hi, This unit was Liquid damaged, turn on and works but fan spin very fast so i did ultraso for 10 minutes and now it has stable orange light but no fan spinning. and i see liquid was arouns U7100. PPBUS_G3H =8.57v PPDCIN_G3H_ISOL =16.84v PPDCIN_G3H =16.84v PP3V42_G3H =3.42v PPVRTC_G3H= 3.33v...

It was working unit and tried to check another screen after that it has no backlight. F9700= 12.6V on both sides, did a PRAM reset already! BKLT_EN_L= 0V BKLT_EN_DIV= 4.3V PPBUS_SW_BKLT = 12.6V BKLT_EN=3.1V D9701 =P1=12.55,P2=55V PPVOUT_S0_LCDBKLT=55.39V BKL_SW =1.46V BKL_FB=25V

JohnB8812 , you are right. Thanks.

I reflow LED driver and now it works. You guys awesome, Thanks a lot you all.

resistance to ground on all its connections, diode mode PP3V3_S0=.315 PP5V_S0=.411 LCDBKLT_BOOST=OL LCDBKLT_FB=.582 BKL_ISEN1=.584 BKL_ISEN3=.584 BKL_ISEN5=0L BKL_ISEN6=OL BKL_EN=.517 BKL_PWM=.486 BKL_SDA=.430 BKL_SCL=.430 BKL_FSET=.519 BKL_ISET=.516 BKL_FLTR=OL BKL_VSYNC_R=OL

Before replacing U7701 i got 18V, then 8.5V . After replacing now i got 8.5v.

Yes i replace the Led driver and now i see bklight output at C8317=8.56v and i tried good known DC in board and flat cable too.

After Put R7704 back bklight output at C8317=18v and slowly drop 8.56v

Water damages around bcklight driver changes couple cap and reg and found PPVOUT_SW_LCDBKLT_FB=18v and slowly drop 8.56v BKL_EN=2.8v BKL_PWM=0v Remove R7704 and connect PWM directly to 3V ( C7711 ) and i see it works. Is it the permanent fix or is there any demerits.Thanks.

Pins 1 U6900 =3.48 is now stable , after changing my dc jack.

U6901 voltages: pin 1/2=2.87v pin4=3.49v pin5=3.49v solders and traces for U6900/01 are ok. When i plug in it become orange and after few minutes no light.

Pins 1 U6900 =3.48 TO 3.0V isn't stable Pins 4 & 5 of U6900 =3.47v to 2.9v aren't stable too I think some component got loose connection bcs it was working unit after i changed hinges cover then this problem arise.

Not start in SMC bypass mode , central pin of DCIN board v goes down rapidly 0 v and up 2 v , cycle.

Green light is off when plugin 60w adapter Green light is on when plugin 85w adapter Both times no fan spinning.

SMC_RESET_L =3.41v central pin of DCIN board=3.46v Check continuity from U6900 to it. is ok Now I see green light. but not turn on.

This is known good original adapter. Pins 4 & 5 of U6900 have both same 3.48v ( before it was wrong) so what should i check next

i put it back origianl Bios and get back green light for while when reconnect it no green light PP3V3_S3=0v ppbus-G3H=12.26v PP3V42_G3H at C6908=3.49v SMC_BC_ACOK_VCC=3.49V ADAPTER_SENSE=2.9V SMC_ADAPTER_EN ( Q7920 PIN2)=0V