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I don't understand "change U700" ?

What should BKLT_SD be to be good? LCD Assembly good tried on working MacBook. BKLT_SCL = 4.62v 0.468 BKLT_SDA = 4.54v 0.464 R7750 to 53 all good. Traces appear fine.

12.38v bklt_sd 12.56v both sides of f7700 Fuse has continuity

D7710 voltages. Pin 1 (PPVIN_SW_LCDBKLT_SW) = 0.01v Pin 2 (PPVOUT_S0_LCDBKLT) = 0v

No backlight Some readings U7700 Pin 1&2 LCDBKLT_SW = 0.1v Pin 4 LCDBKLT_FET_DRV = 0v Pin 5 PP5V_S0_BKLT_D = 5.15v Pin 18 PP5V_S0_BKLT_A = 5.15v Pin 17 BKLT_EN_R = 3.34v Thank you

R7121 and 22 were open circuit. Replaced both and problem solved. You are an absolute genius! I don't know how you do it but I will read through our discussion and try and understand why you asked me to do the things you asked me to do. Thank you very much!

PPBUS_G3H charger only = 12.57 With lab PSU only and NO battery I get green then amber light but I can't get the board to power on (have tried powering on using the pads and also with keyboard) It will, however, power on with lab PSU + Battery and the light does stay on the magsafe (amber) I...

U7100 with charger and battery connected pin 1 = .019 pin 2 = .078 pin 3 = .019 pin 9 = 0 pin 12 = 3.390 pin 13 = 3.360 pin 15 = .060 pin 19 = 0 pin 20 = 0 pin 27 = 10.55 How do I check for a short between R7120 and R7150 please?

Should I have the battery and magsafe pugged in when measuring the voltages on U7100 ?

U7100 Voltages MagSafe Only Pin 1 - SMC_BC_ACOK = 3.395 Pin 2 - SMC_BC_ACOK = 3.150 Pin 3 - GND = 0 Pin 4 - SMC_BC_ACOK_VCC = 3.395 Pin 5 - PP3v42_G3H = 3.395 Battery Only Pin 1 - SMC_BC_ACOK = 0 Pin 2 - SMC_BC_ACOK = 0 Pin 3 - GND = 0 Pin 4 - SMC_BC_ACOK_VCC = 0 Pin 5 - PP3v42_G3H = 3.391...

When the problem happens all voltages on U7000 are ZERO

With battery ONLY I get the following:- SCL = 3.383v .496 SDA = 3.383v .494 Yes have tried with different known good batteries. If I plug the charger in the light goes out one second before I get USB activity and then the voltages are not stable on SCL and SDA. SCL & SDA fluctuate from...

Do you want me to measure voltages at U7000 with battery and magsafe connected (when magsafe light goes out)?

MagSafe light will only go off if battery connected and magsafe plugged in. Which voltage do you want me to check?

U7000 Readings with MagSafe plugged in amber light (no battery) Pin 1 - SMC_BC_ACOK_VCC = 3.395v Pin 2 - Ground = 0v Pin 3 - Unconnected = 0v Pin 4 - Sys_Onewire = 3.373v Pin 5 - Adapter_Sense = 3.373v

What is J6700 ??? I have checked from the middle pin on MagSafe to Pin 5 of U7000 and there is no problem with continuity. Do you want U7000 voltages without battery plugged in? Thanks Note " I hope you don't need DCIN schematic to find them. " lol that's really funny hahahaha :)

Adapter Sense pin6 on J7000 and pin5 on U7000 ??

Can you be more specific regarding continuity test? Which pin on U7000 and which central pin on Magsafe please? Thanks

Have tried replacing U7100, Reflowed SMC, Replaced D7010 and replaced Q7130 but problem still persists.

Also tried multiple chargers