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now ok ? R4852 20 OHM OK R4715 2.9 KOHM OK SPI_TPAD_CLK impedance to GND at R4852 37 KOHM

U6860 measurements pin 1 1.8v @ r6803 pin2 0v @ 2pin ************ SPI_TPAD_CLK missed pin 3 1.8v @ 3pin pin 4 1.8v @ r4867 pin5 1.8v @ 5pin pin 9 3.3v @ r6874 pin 10 3.3v @ r6871 pin 11 0v @ r6875 ************...

I test other keyboard but not working there is no liquids on touch pad or cables or connectors

I flash BIOS but not fixed. mac working ,charging and responsible to REST SMC via keyboard I have other same mac and test to swap lcd bot no display. please what is yours suggestion.

"Some people complain this board didn't start without both charger and battery connected. " yes exactly true must both be connected. it works fine but i replace both 7100 and 7501 thanks for your support.

PCH_INTRUDER_L 3.04v , and PCH_INTVRMEN 3.23v. PM_SLP_S5_L , PM_SLP_S4_L , PM_SLP_S3_L PM_SLP_S0_L none of them pulse when i trigger SMC_ONOFF_L stay at 0v level .

PM_PWRBTN_L , SMC_ONOFF_L , are 3.34v PCH_SRTCRST_L , RTC_RESET_L are 3.3v PCH_CLK32K_RTCX1 is 0.43v PM_PWRBTN_L drops to 0.36v when SMC_ONOFF_L triggered

PCH_DSWVRMEN, PM_RSMRST_L , PP3V3_S5, SMC_PM_G2_EN, S5_PWRGD, S5_PWR_EN, all 3.33V but P5VS3_EN, P5VS3_PGOOD is 0V what else to test?

S5_PWRGD, SMC_S5_PWRGD_VIN, PP3V3_SUS ARE 3.34V. BUT ALL_SYS_PWRGD LOSSED,

Fan starts normally and rapidly go to full speed due to CPU gets hot. I try more than SSD all not detected in Disk Utility and its works fine in other machine properly. REBALLING SMC THEN REFLASH BIOS FIX THE PROBLEM THANKS 2informaticos

Also PM_BATLOW_L control by pch may be cpu chip defective? note: mac can boot from battery but ssd not be detected and temperature of cpu is very high and fan full speed spaining.

I check it 10k ohm and fin connected to surrounding components and the impedance between PM_BATLOW_L and ground is about 3M Ohm, also i check PP3V3_S4 transistor Q3000 no problem.

Yes I use original charger and test other charger but the same situation When I trigger SMC_ONOFF_L pulse of PM_PWRBTN_L drop from 3.41 to 0.34 but no boot up fan not spin IT STARTS NORMALLY FROM BATTERY BUT NOT DETECTS SSD. I APPLIED SMC RESET AND PRAM RESET BUT NOT BOOT FROM CHARGER

ALL TESTS ON AC ADAPTER ONLY PM_BATLOW_L --- 0.03 PP3V3_S5 --- 3.33 PP3V3_SUS --- 3.23 PM_RSMRST_L --- 3.30 PM_PWRBTN_L --- 3.41 PM_DSW_PWRGD --- 3.41 PCH_DSWVRMEN ---- 3.23

Thanks for your reply Resistance between pins 17/18 2.4 ohm 27/28 14.9 ohm. U7100 voltages; pins 1, 0 2, 14.37 3, 3.88 6, 0 9, 0 12, 3.41 13, 3.38 14, 3.38 15, 0 17, 8.58 19, 8.58 20, 5.02 27. 14.37

when AC adapter connected fan not spain and charging led turns to red without attaching battery , when battery is attached charging led go to green and macbook works ,when i remove battery mac still working , in other hand macbook boot up and ssd not recognized and cpu temperature is so high...