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r5087 value is good, i changed it but it still pull down smc_bc_acok across it.

yeah, no green light and not turning on. smc_reset_l 3.3v good these machine can turn on without green light ok, but these machine doesnt turn on automatically ( it should be )

diode mode on scl sda is 0.461 0.461, so good.

Hi, this board came in with no magsafe light. I track down the problem to u7000, q7030, and q7035. replaced all, and magsafe green light come. a few days later customer came back, no green light. i see ppbus is 12.2v. I have tried replacing smc 3 times.but still ppbus 12.2v and no green light. I...

no.. i know 53v is without load, let me revise my question, what component turn that 12.3v to 39v ? i have checked all my measurement with lcd connected.

Yeah still 12.3v at 1/j8300.. which component turn that ppbus voltage to 53v ?

Diode is good, because only O.L in one way right?

r7744/45 is 0 ohm resistance , normal u7700 is powered up 5v by vddd and vdda normally too. d7710 and l7710 replaced. no backlight still.

how do you measure a coil ? L7710 resistance is 0.1 ohm, is that good ?

scl sda voltage is 4.5v 4.6v lcd_psr_en is 0v edp_bkl_en is 3.3v

R7731-33 is good resistance all according to schematic. Diode mode both scl and sda is same, so its good 0.451, Any chance q7701 and q7700 kill each other? Should i replace at once ? *update : q7701 and q7700 replaced at once still not boosting.

i have changed lvds connector, still same. diode mode at lvds : 1 : 0.400 2 : nc 3 : 0.464 4 : 0.464 5 : 0.525 6 : 0.640 7: 0.610 8: 0.510 9: 0.730 10: 0.430 u7700 have continuity from their pin to their surrounding component. scl and sda line from u7700 have continuity to lvds connector...

Yep absolutely sure theres an apple logo there, i get usb activity too. The liquid damage i found is only that short i dig out. Im a bit concern maybe theres some line didnt reach it destination maybe cut out by the traces i dig? I will try to change lvds, even thought it looks good

I found that LCDBKLT_FET_DRV_R doesnt have any voltage, is that normal ?

yes its connected. 0.1 ohm resistance, so good.

820-4924 no backlight. liquid damage at q7701. shorted inside the board at PPVIN_SW_LCDBKLT_SW, so i dig out the short, now resistance is good at 0.4kohm fuse is good 12.6v at both side ppvout is 12.6v at pin 1 of lvds connector. i have bklt_en_R 3.3v I use known good must be working 2015 lcd. I...

no need to test without bil because i still test it outside the chassis. diode mode 0.452 sda 0.230 scl, i changed d6950, now sda scl is 460 452, looks good. smc bc acok at u6901 has 2.8v now, and i have green light. but ppbus still 12.3v

Hi, ,this board came in with corrosion near smc and thunderbolt ic, there's a short on ppbus_g3h near u6901, at the thunderbolt stuff, anyway , i clean the corrosion and dig out the short, ppbus came in at 12.3v I already test the smc at known good board, and i know the smc is good, i also...

nvm, pp1v05 is short inside u1000, and this board has been oven'ed too.. cancelling this work..

hi, this board came in, sign of flux here and there ppbus is 12.3v, no magsafe light immediately tried changing smc, but still same. i tried his smc to my board, and it work ( orange light and ppbus 12.56v) so im sure smc is good, i have tried replacing isl too, but still smc is not running...