820-00165 SMC_RESET_L signal at 0V

[huzeafa]

good day guys , this board is making me go crazy, SMC_RESET is 0V , but when I remove R5110 it goes high , when I put it back its low, I replaced it, but no difference , I tried with the SMC as well as R7100 to rule out a faulty U7100, and even R5100 replaced , all with no changes , please where do I go from here ? also the jtag is already removed even though was Spotless

 

[captainmac]

probably pulled down by the SMC then..

 

[2informaticos]

Post all voltages for U5110.
Change C5101.
Don't forget to disconnect trackpad flex.
If still the same, remove U5110 and check if SMC_RESET_L goes high.

 

[huzeafa]

probably pulled down by the SMC then..

have replaced 3 functional SMC, with U5110 removed it goes high

 

[huzeafa]

I have replaced C5101 but no changes , with U5110 removed SMC_RESET_L is high
below are the readings of U5110

U5110

PIN 1. 3.40V

PIN 2.GND

PIN 3.0V

PIN 4.0V

PIN 5. 0V

PIN 6.3V

PIN 7.3.3V

PIN 8. 1.1 and drops gradually

 

[2informaticos]

Change R5127 first; VIN is required...

 

[huzeafa]

my bad , R5127 voltage is resent and pin 3 is 3.3V

 

[2informaticos]

Post diode mode at pin 8.

 

[huzeafa]

Thank you , the post can be closed .
The issue was as you pointed out at R5127, even though 3.3V was present in and out , there was a break between the resistor and pin 3 of U5110, I recreated the break and the board worked okay . Thank you so much

 

[2informaticos]

You're welcome!