820-2936 PP3V3_S5 problem

[pcfriends]

balls ... SMC_PM_G2_EN

is doing the same back and forward voltage

 

[larossmann]

welcome to hell. https://www.youtube.com/watch?v=qjGOfNLT_2A

Is SMC_RESET_L fluctuating?

 

[pcfriends]

hello master , SMC_RESET_L is not fluctuating is steady 3.4V , anything I can try beside replacing SMC?

 

[dukefawks]

Does it power on when trying SMC bypass?

 

[pcfriends]

hello I finally got a SMC for this board I didn't try to power it on SMC bypass , I didn't see your msg master duke , I replace the SMC , and the problem remain , (fuck I was able to replace a smc thank you guys!) , anyway I remove U7941 and the SMC_PM_G2_EN on pin 2 is 3.4v then I replace U7941 thinking oh well the SMC was not the problem? , so must me U7941 nothing ... problem remain.
So I remove R7941 , and R7273 to see if maybe something ahead was making the PM signal to be moving , but still nothing

I was thinking to remove L7220 to see if that will make any chances on U7941 signals ?
What i should do?

 

[pcfriends]

i did remove L7220 and i feel like shit , SMC was good all the time i guess? , because without L7220 SMC_PM_G2_EN is steady 3.4v .... so some shit is going on at PP3V3_S5 to make U7941 go crazy.... so i guess i should go and troubleshot the u7200 area for crap?

 

[pcfriends]

question :

to troubleshoot U7200 P3V3S5_EN_L should be present right? 3.3v?

 

[pcfriends]

Ok i will re do the question is missing PP3V3_S5 what I should do?

 

[dukefawks]

Resistance to GND on 3v3_s5? If not shorted replace the TPS51125

 

[pcfriends]

.127 resistance to GND is not shorted right? so I will replace TPS51125 and come back any source to buy new ones?

 

[aprendiz]

China, Digikey, Mouser, Newark and maybe Louis....

 

[dukefawks]

Scrap boards from mac, also very common on PC laptop boards.

 

[pcfriends]

hello I have a general question about the enables for TPS51125 I was checking U7941 and im missing : P3V3S5_EN_L_R with out this u7200 cant turn on? or im wrong?

 

[pcfriends]

I change u7200 and voltage keeps going back and forward on PP3V3_S5 now is fluctuating

 

[dukefawks]

Is PPBUS_G3H stable at 12.6V?