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[email protected]
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Thanks a lot for your understanding.
the PP3v3_S4 is present but pp3_v3_s4sw_sns and PP1V35_S3 are missing.
you suggested to check the S3 supplies to see which one is not creating tension,
S3 supplies are the same as S3 switches? where the S3 rail gets created?
when I measure the resistance on R2221 I get 0,558 kilo ohm but it should be 1kohm
the PP3v3_S4 is present but pp3_v3_s4sw_sns and PP1V35_S3 are missing.
you suggested to check the S3 supplies to see which one is not creating tension,
S3 supplies are the same as S3 switches? where the S3 rail gets created?
when I measure the resistance on R2221 I get 0,558 kilo ohm but it should be 1kohm
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PP3V3_S4SW_SNS is required for the SMC sensors.
Did you try SMC bypass?
S3 supplies should be controlled by PM_SLP_S4_L.
S0 supplies are controlled by PM_SLP_S3_L.
Take a look at page 61.
Measure a resistor onboard, when is connected with other components, is not the best idea.
There are more resistors with similar value; te result will be lower value...
Did you try SMC bypass?
S3 supplies should be controlled by PM_SLP_S4_L.
S0 supplies are controlled by PM_SLP_S3_L.
Take a look at page 61.
Measure a resistor onboard, when is connected with other components, is not the best idea.
There are more resistors with similar value; te result will be lower value...
[email protected]
New member
Dear Sir it turns on when I bypass the SMC and fan spins very fast. but no image
what should I do next?
what should I do next?
Do you have USB activity?
Connect an USB mouse, and reconnect it when board is on; let see if gets light.
Connect an USB mouse, and reconnect it when board is on; let see if gets light.
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[email protected]
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the USB is active and I get light even when I disconnect and connect it to the board
Seems that board boots in SMC bypass.
No image, nor backlight?
Try external monitor too.
No image, nor backlight?
Try external monitor too.
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New member
no unfortunately nothing on external monitor not via HDMI nor Thunderbolt
Will be better to test USB with external OSX.
Need pendrive, or HDD adapter with link LED.
If flashes, means USB activity for sure; mouse can get confused.
Post values for chgr_amon and chgr_bmon, whitout starting in bypass mode.
SMC_AVREF voltage is present?
Need pendrive, or HDD adapter with link LED.
If flashes, means USB activity for sure; mouse can get confused.
Post values for chgr_amon and chgr_bmon, whitout starting in bypass mode.
SMC_AVREF voltage is present?
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chgr_amon is 0.089v and chgr_bmon is 0.1V
I can't. find any the SMC_AVREF not in the schematics nor board view.
I tested with an external HDD the lights burns
I can't. find any the SMC_AVREF not in the schematics nor board view.
I tested with an external HDD the lights burns
"SMC_AVREF not in the schematics"
PP3V3_S5_AVREF_SMC
Post SMC_DCIN_VSENSE and PPDCIN_G3H_ISOL.
PP3V3_S5_AVREF_SMC
Post SMC_DCIN_VSENSE and PPDCIN_G3H_ISOL.
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SMC_DCIN_VSENSE is 2.5v and PPDCIN_G3H_ISOL is 17.05v
PP3V3_S5_AVREF_SMC is 3.29
PP3V3_S5_AVREF_SMC is 3.29
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SMC_SENSOR_PWR_EN only appears in S0 state.
So there should be something else which blocks the SMC in S5 state; could be some bad solders.
Reball SMC; if no result, change it...
So there should be something else which blocks the SMC in S5 state; could be some bad solders.
Reball SMC; if no result, change it...
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I have noticed that the SSD gets worm when it's connected to the board and also when it's connected I see that the power supply uses 0.1 amp and when I disconnect the ssd from the board than amperage drops back to 0.
Check PP3V3_S0SW_SSD_FET.
It should not be present in S5 state.
If you get voltage there, change U8070.
It should not be present in S5 state.
If you get voltage there, change U8070.
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Could you please help me understanding one thing,
As I understood from your previews explanations 5 volt rail and 3v rail are created by the same component. and an other component ( the SMC i think ) decides which state should become enable ( S5,S4,S3 and S0). Am I correct?
An other thing is that first AL S5 rails must be working than the board can go to the next state I mean without S5 there will be no S4 and S3?
for example if the 5v is present but only in S5 and not present in PP5_V5_S3 than it mean's that there is something on S3 rail gone bad and sends the 5v to the ground or blocks the 5v.
I'm really really great full and appreciate your help and effort.
As I understood from your previews explanations 5 volt rail and 3v rail are created by the same component. and an other component ( the SMC i think ) decides which state should become enable ( S5,S4,S3 and S0). Am I correct?
An other thing is that first AL S5 rails must be working than the board can go to the next state I mean without S5 there will be no S4 and S3?
for example if the 5v is present but only in S5 and not present in PP5_V5_S3 than it mean's that there is something on S3 rail gone bad and sends the 5v to the ground or blocks the 5v.
I'm really really great full and appreciate your help and effort.
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A direct short to ground is easy to confirm; doesn't even need to power up the board.
But a short, or overcurrent, can drop a voltage (S3 for example) only when that power rail is enabled.
Immediately after charger is plugged in, board goes from G3 (mechanical off) state to G2-S5 state.
G2 contains S5 to S0 states.
To exit from S5, PM_SLP_S5_L must be disabled; that means to go high, be aware of _L from the end of name!!!
Many times PM_SLP_S4_L is used instead of S5 one...
Anyone of these signals will let the board in S3 state; also known as Suspend to RAM.
To achieve full working state (S0), PM_SLP_S3_L should go high (disabled).
S4 is known as Suspend to HDD sometime.
BTW, 5V_S5 line from MacBooks is a low power line.
5V high power line appears in S4, or S3 state; on the corresponding big coil.
But a short, or overcurrent, can drop a voltage (S3 for example) only when that power rail is enabled.
Immediately after charger is plugged in, board goes from G3 (mechanical off) state to G2-S5 state.
G2 contains S5 to S0 states.
To exit from S5, PM_SLP_S5_L must be disabled; that means to go high, be aware of _L from the end of name!!!
Many times PM_SLP_S4_L is used instead of S5 one...
Anyone of these signals will let the board in S3 state; also known as Suspend to RAM.
To achieve full working state (S0), PM_SLP_S3_L should go high (disabled).
S4 is known as Suspend to HDD sometime.
BTW, 5V_S5 line from MacBooks is a low power line.
5V high power line appears in S4, or S3 state; on the corresponding big coil.