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No corrosion under trackpad connector. It works a bit in macOS mode. I tried good known working tPad it was same issue. After booting it wasn't work but few seconds later it works and again it stop work ---- happened again and again.

It was water damaged.Changed working tpad, kb and cable but no luck. It works for few seconds and again stop working. J4800: PP3V42_G3H_IPD)= 3.3v and Ground mode : pin1= .41 ,pin2= .41 , pin3= .00 ,pin4= .355 ,pin5= .355 ,pin6=.00 pin7= .43 ,pin8= .00 ,pin9= .43...

https://drive.google.com/open?id=1H0...wxuADmiTI6vsdc , could you please try it ? One more thing what Bios programmer you do recommend, I use CH341A but some time it doesn't support all chip. Thanks.

PJS thanks for your reply. I also solve the problem like this what you said but the problem is when the customer need to reinstall the osx again it comes up. Thats why i am looking for permanent solution. Thanks again.

I am sure this is not stolen i bought it as auction lot. Can i use same model good bios for flashing it?? I have attached the picture.

This is Macbook pro 15 2015 , when trying to install OSX shows remote management issue. When cancel it keep going install osx. But still shows me Remote management popup , Do you know how to stiop it for ever.Thanks.

Found pulses at SCL/SDA lines. R7100 is good.Replacing U7100 . Rflow SMC but no luck. This is my second one mb but no luck. Dont know what the exactly issue.

820-00165-a BATTERY NOT DETECTED. This boards is working one except battery not detected. R5380: 1.9K, R5381: 1.9k, PPBUS_G3H: 8.58V with charger diode mode J6950 P4: 0.473, J6950 P5: 0.473 , J6950 P6: OL R6950: 10 K This is good battery works with other unit. Any help please.

Changed R5380 now its ok ( 2k ohm) but still PPBUS-G3h is 8.18V This is good battery works with other unit.

820-00165-a BATTERY NOT DETECTED. This boards was water damaged working except battery not detected. R5380: 26m ???? R5381: 2k PPBUS_G3H: 8.2V with charger diode mode J6950 P4: 0.48 J6950 P5: 0.48 J6950 P6: OL Any help please.

PM_RSMRST_L 3.3v, heating it to 180-200 degrees using quality flux no luck. SCRAP!!

My BV shows PPVRTC_G3H should be 6.3 but actualy got 3.3, the first one 0 V was wrong. This board looks very clean overall.

Trigger SMC_ONOFF_L, drop pulse at PM_PWRBTN_L=0.36v pulse at a time PM_SLP_S0_L =0v PM_SLP_S3_L=0v PM_SLP_S4_L= 0v 3V3_SUS=3.3v PCH_INTRUDER_L : 3.3 PCH_INTVRMEN: 3.0 PCH_SRTCRST_L:3.3 RTC_RESET_L:3.3 PPVRTC_G3H=0v

S5_PWRGD: 3.4v DSW_PWRGD: 3.4V" Pin12: .45V" ( right one) PM_BATLOW_L 3.3v 3V3_S5 3.3v Trigger SMC_ONOFF_L, drop pulse at PM_PWRBTN_L=0.36v pulse at PM_SLP_Sx_L couldnt find on B.view. Dont know how to check RTC signal. SMC bypass no luck.

HI, This MB looks very good , no sign of water damaged. Green/ orange light but not turn on S5_PWRGD: 0v DSW_PWRGD: 3.4V PM_RSMRST_L: 3.2v ADAPTER_EN: 3.4V ppvcc_s0_cpu 0v ALL_SYS_PWRGD 0v SYSCLK_CLK25M_X1 .6v SYSCLK_CLK25M_X2_R 0v U1900 pin 12: 0v Pin 1: 3.3V Pin 5: 3.3V Pin12: .45V Pin 13...

change U1950 and check all registers , unit is back in normal. Solved. Thanks a lot.

pins 5/6 voltage=0 v and yes corrosion around U1950.

3/U1950=.32v not stable ( .48 to .32 V) Vcore yes, 1.7v. S0 V yes.

ALL_SYS_PWRGD 3.3v

PM_SLP_S3_L, 3.3v