What's no good with PPBUS_G3H???
Why don't you like 8.65V, any reason?
Machine boots now?
Why don't you like 8.65V, any reason?
Machine boots now?
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820-4924 q7130
- Thread starter grmacs
- Start date
Oh I thought this board needed 12.65V at PPBUS_G3H. Is 8.65V most macbooks mid 2012 and later?
No fan spin so I guess I assumed! Ok. well I need to poke around some more. THanks!
trying to see if I have a different dcin for this board but sometimes I get 5V at PPBUS G3H when first connecting to power and other times I get the 8.65
No fan spin so I guess I assumed! Ok. well I need to poke around some more. THanks!
trying to see if I have a different dcin for this board but sometimes I get 5V at PPBUS G3H when first connecting to power and other times I get the 8.65
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Check signals and voltages for Power On Sequence when you get correct PPBUS_G3H.
Do you have original 60/85W Magsafe 2 charger?
Be aware, some people reported 4924 board didn't turn on without battery connected (and charger).
I didn't face with this issue myself...
Do you have original 60/85W Magsafe 2 charger?
Be aware, some people reported 4924 board didn't turn on without battery connected (and charger).
I didn't face with this issue myself...
Hi there, Ok yes this is for 2015 13" Pro - so I do need 12.65V and I did have that prior to replacing the SMC but also I had pulled a couple of components before I did the SMC looking for short SO although I have no reason to believe something I did caused me to lose the 12.65V I had, apparently something has changed. SMC should be correct one yes.
Having 3.4V at pin 6 of the ISL is what determines the base voltage of ppbus G3H, correct? I'm thinking it can't be a coincidence that I'm getting 8.65 sometimes 5V and was getting the proper 12.65 but aren't those the values I'd get from properly boosted by SMC PPBUS based on CELL being either 1 cell (5V), 2 Cell (8.65V) or 3 Cell (12.65V)? BUT checking voltage I'm getting at pin 6 i get 3.42V which SHOULD be getting me the correct PPBUS_G3H 12.65V. I tried changing the ISL and solders look great on it all the way around.
To me seems like SMC is working as it appears I'm getting boosted PPBUS voltage depending on what battery cell the ISL seems to think is there? 5V, 8.65V are outputs of correct PPBUS_G3H with 1 cell and 2 cell battery voltage... could be coincidence being though being that I have 3.42V at pin 6 and changed the ISL checked solder joints and still no 12.65V! lol I mean if i have proper voltage at pin 6 and good ISL with proper solder joints, I should be getting the proper base voltage for PPBUS, correct?
The base voltage for 3 cells is 12.3V; it is adjusted after ISL6259 negotiates with SMC.
You can also have problems with the R/C networks connected at pins 5, 7, 8.
Post basic voltages for U7100; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 29, 26, 27.
Also check resistance between pins 17/18 and 27/28.
Replace C7125, just in case.
You can also have problems with the R/C networks connected at pins 5, 7, 8.
Post basic voltages for U7100; pins 1, 2, 3, 9, 12, 13, 14, 15, 17, 19, 29, 26, 27.
Also check resistance between pins 17/18 and 27/28.
Replace C7125, just in case.
replaced C7125. ENded up replacing ISL not sure what happened but had all sorts of resistors wrong readings and voltages off at ISL. Board holding a charge while resoldering? I didnt have it plugged in while poking around or redoing some things but something happened for sure. oy.
After ISL and C7125 replaced AND also R7105 and R7111 I appear to be back where I was with riding this slow PPBUS
ISL is
1-0V
2- 16.5V
3- 4V
9- 0v
12 3.42V
13 3.42V
14 -3.3V
17 -8.63V
19 - 5V
20 5V
27 16.1V
PPBUS 8.63V
diode ppbus 1.21V
resistance 17/18 - 3.4 ohms, 27/28 - 22 ohms
side note: noticed SMC Adapter eN is still basically 0V, resistance is very low on that resistor R5185 is 2.7 ohms. replaced and get the same so something at SMC is dropping that resistance down. I don't believe I measured there before but seems like an issue that existed before and after replacing SMC. About ready to turn this board into a parts board.
After ISL and C7125 replaced AND also R7105 and R7111 I appear to be back where I was with riding this slow PPBUS
ISL is
1-0V
2- 16.5V
3- 4V
9- 0v
12 3.42V
13 3.42V
14 -3.3V
17 -8.63V
19 - 5V
20 5V
27 16.1V
PPBUS 8.63V
diode ppbus 1.21V
resistance 17/18 - 3.4 ohms, 27/28 - 22 ohms
side note: noticed SMC Adapter eN is still basically 0V, resistance is very low on that resistor R5185 is 2.7 ohms. replaced and get the same so something at SMC is dropping that resistance down. I don't believe I measured there before but seems like an issue that existed before and after replacing SMC. About ready to turn this board into a parts board.
"resistance is very low on that resistor R5185 is 2.7 ohms"
Is that pin 1 of R5185?
Bad news then; only SMC and PCH are connected there...
Is that pin 1 of R5185?
Bad news then; only SMC and PCH are connected there...
Do you really have short at SMC_ADAPTER_EN?
If yes, remove SMC and check again; maybe just short between its balls.
If not, then bad PCH...
If yes, remove SMC and check again; maybe just short between its balls.
If not, then bad PCH...
eh yep. Pulled SMC and .004V diode red to ground at pin 78. Wish I had dug into that a little more prior to swapping the SMC as I knew that to be low voltage there but never checked for short and don't recall checking that resistor measurement before only that the voltage wasnt there. Dumb but chalk it up to an education!