-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
820-00165 liquid damage
- Thread starter Ryanlen2
- Start date
Does it start in SMC bypass mode?
Post SMC_ADAPTER_EN, PM_BATLOW_L, PM_RSMRST_L.
Trigger SMC_ONOFF_L and see if get a drop pulse at PM_PWRBTN_L.
If not, check PM_DSW_PWRGD, PCH_DSWVRMEN and all (4) RTC signals.
Post SMC_ADAPTER_EN, PM_BATLOW_L, PM_RSMRST_L.
Trigger SMC_ONOFF_L and see if get a drop pulse at PM_PWRBTN_L.
If not, check PM_DSW_PWRGD, PCH_DSWVRMEN and all (4) RTC signals.
I was able to turn on once in what I think was SMC Bypass by holding power down for 10 secs then releasing and hitting power again. (It was no chime and no light on mouse) got fan spin and 1.8v on vcore. I have not been able to get it to turn on again. This being a 2015, does need to have battery plugged in to it to turn on? Please clarify how to get into SMC Bypass please on this particular board so that i can rule it out, and move on to the measurements you asked for...
17/18 , 27/28 is right where it should be.
Thanks again!
17/18 , 27/28 is right where it should be.
Thanks again!
Press power button, connect charger and maintain pressing 5-10s...
"17/18 , 27/28 is right where it should be."
On ISL6259.
Measure mentioned signals with board in off state.
We need to see which signal blocks the board to start.
"17/18 , 27/28 is right where it should be."
On ISL6259.
Measure mentioned signals with board in off state.
We need to see which signal blocks the board to start.
"PM_BATLOW_L - 0.036V"
First try original Apple 60W charger.
First try original Apple 60W charger.
Does it work with this charger?
If not, post results for above mentioned measurements...
If not, post results for above mentioned measurements...
No change with different charger unfortunately...
New measurements -
SMC_ADAPTER_EN 3.412V
PM_BATLOW_L - 3.315V
PM_RSMRST_L - Fluctuates - 3.12 - 3.14V
PM_PWRBTN_L - 3.408v, goes down to 0.353V when SMC_ ONOFF_L is triggered.
PM_DSW_PWRGD - 3.412V
PCH_DSWVRMEN - fluctuates between 2.3V and 2.5V
I dont have a scope to give signals, sorry.
Thanks or the help, take care.
New measurements -
SMC_ADAPTER_EN 3.412V
PM_BATLOW_L - 3.315V
PM_RSMRST_L - Fluctuates - 3.12 - 3.14V
PM_PWRBTN_L - 3.408v, goes down to 0.353V when SMC_ ONOFF_L is triggered.
PM_DSW_PWRGD - 3.412V
PCH_DSWVRMEN - fluctuates between 2.3V and 2.5V
I dont have a scope to give signals, sorry.
Thanks or the help, take care.
Last edited:
"and all (4) RTC signals."
RTC_RESET_L, PCH_SRTCRST_L, PCH_INTVRMEN, PCH_INTRUDER_L.
No o-scpoe needed, just DC voltage...
"PM_PWRBTN_L - 3.408v, goes down to 0.353V when SMC_ ONOFF_L is triggered."
Check if PM_SLP_S4_L pulses at least, at the same moment.
RTC_RESET_L, PCH_SRTCRST_L, PCH_INTVRMEN, PCH_INTRUDER_L.
No o-scpoe needed, just DC voltage...
"PM_PWRBTN_L - 3.408v, goes down to 0.353V when SMC_ ONOFF_L is triggered."
Check if PM_SLP_S4_L pulses at least, at the same moment.
"PCH_INTRUDER_L - 1.85V - 1.89V"
Are you sure?
That is too low...
First check R1301.
If OK, put quality flux and heat PCH.
You may have luck and there is just some crap underneath.
Are you sure?
That is too low...
First check R1301.
If OK, put quality flux and heat PCH.
You may have luck and there is just some crap underneath.
PCH_INTRUDER_L - (1.9V to 2.1V)
Though R1301 looked fine and measured correctly, I replaced anyway, now getting 2.2V
PPVCC_S0_CPU pulses when I first plug in the charger.
Tried the flux under board with no success
Since you led me to PCH_INTRUDER_L I noticed that the TP next to the CPU\PCH was slightly burnt. I tinned the pad but still no success.
(I know I should have noticed this sooner but if you hadn't led me there I wouldn't have known.)
With the burnt TP I'm guessing PCH is done...
Thanks for all your help.
Though R1301 looked fine and measured correctly, I replaced anyway, now getting 2.2V
PPVCC_S0_CPU pulses when I first plug in the charger.
Tried the flux under board with no success
Since you led me to PCH_INTRUDER_L I noticed that the TP next to the CPU\PCH was slightly burnt. I tinned the pad but still no success.
(I know I should have noticed this sooner but if you hadn't led me there I wouldn't have known.)
With the burnt TP I'm guessing PCH is done...
Thanks for all your help.
Try lower value for R1301, 470-100K.
Let see if starts if you get aprox 2.4V at PCH_INTRUDER_L.
Let see if starts if you get aprox 2.4V at PCH_INTRUDER_L.
This looks like bad PCH indeed...
I guess so.
Hey , thanks 2informaticos for all your help walking me through it, even though it didn't work.
I appreciate it, take care.
Hey , thanks 2informaticos for all your help walking me through it, even though it didn't work.
I appreciate it, take care.