rupesh.amit
Member
Can anyone help me out with the 820 00165A?
5V Missing
P5VS4RS3_EN_R fluctuating
5V Missing
P5VS4RS3_EN_R fluctuating
-
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 00165A .... 5v Missing
- Thread starter rupesh.amit
- Start date
First of all, welcome to the forum!
Fluctuating how?
Do you get pulse every 2, or 5 seconds?
Or the voltage fluctuates continuosly?
What about 3v3_S5 (L7560), PPBUS_G3H and 3V42_G3H?
Post some useful information; any history available?
Fluctuating how?
Do you get pulse every 2, or 5 seconds?
Or the voltage fluctuates continuosly?
What about 3v3_S5 (L7560), PPBUS_G3H and 3V42_G3H?
Post some useful information; any history available?
rupesh.amit
Member
Yes, readings are in mA. MY BAD
Removed R7551
Pin 1 on R7551 P5VS4RS3_EN_R (Present 5V)
Pin 2 on R7551 P5VS4RS3_EN (Pulsing every 2 Second)
No history before
Can you help me with SMC Bypass? I didn't try. I am learning I am not perfect
Removed R7551
Pin 1 on R7551 P5VS4RS3_EN_R (Present 5V)
Pin 2 on R7551 P5VS4RS3_EN (Pulsing every 2 Second)
No history before
Can you help me with SMC Bypass? I didn't try. I am learning I am not perfect
rupesh.amit
Member
Yes, readings are in mA. MY BAD
Removed R7551
Pin 1 on R7551 P5VS4RS3_EN_R (Present 5V)
Pin 2 on R7551 P5VS4RS3_EN (Pulsing every 2 Second)
No history before
SMC bypass? I keep the power button down and plug the charger in ,and then release the power button.....Fan Rotates for a sec and then turns oFF
NO Difference
Removed R7551
Pin 1 on R7551 P5VS4RS3_EN_R (Present 5V)
Pin 2 on R7551 P5VS4RS3_EN (Pulsing every 2 Second)
No history before
SMC bypass? I keep the power button down and plug the charger in ,and then release the power button.....Fan Rotates for a sec and then turns oFF
NO Difference
If fan tries to spin, probably more voltages try to appear on the board.
Check for pulse at all big coils.
Also check pins 1, 3 & 7 of U1950.
Trigger SMC_ONOFF_L and check for pulse at mentioned points (at same time).
Inspect Q8150 and U1950 areas for corrosion.
If machine came from a client, didn't say anything?
Check for pulse at all big coils.
Also check pins 1, 3 & 7 of U1950.
Trigger SMC_ONOFF_L and check for pulse at mentioned points (at same time).
Inspect Q8150 and U1950 areas for corrosion.
If machine came from a client, didn't say anything?
rupesh.amit
Member
I disconnected the L7430 from pin 2
Pin 2 ( PPDDR_S3_REG_R ) : 2 V on the coil
All coil voltages are stable
L7560 = 3.3 V
L7520 = 5V
L7630 = 1.05
L7430 = 2V (Pin 2 end of the coil is disconnected from the board)... This should be 1.2V, but I am getting 2V on Pin2 of the coil which is disconnected from the board. ANY Solutions?
Pin 2 ( PPDDR_S3_REG_R ) : 2 V on the coil
All coil voltages are stable
L7560 = 3.3 V
L7520 = 5V
L7630 = 1.05
L7430 = 2V (Pin 2 end of the coil is disconnected from the board)... This should be 1.2V, but I am getting 2V on Pin2 of the coil which is disconnected from the board. ANY Solutions?
I can't help in this way.
You've been asked to do same checkings on the board.
Very likely corrosion on Q8150, or U1950 areas.
Maybe some problems around U7400, god knows.
We need some accurate information.
You've been asked to do same checkings on the board.
Very likely corrosion on Q8150, or U1950 areas.
Maybe some problems around U7400, god knows.
We need some accurate information.
rupesh.amit
Member
Board looks clean to me ....I am checking under microscope
is it possible ? L7430 = 2V (Pin 2 end of the coil is disconnected from the board)... This should be 1.2V, but I am getting 2V on Pin2 of the coil which is disconnected from the board
is it possible ? L7430 = 2V (Pin 2 end of the coil is disconnected from the board)... This should be 1.2V, but I am getting 2V on Pin2 of the coil which is disconnected from the board
How can you think to test a buck converter without its coil???
Let me know when you decide to post some useful information...
Let me know when you decide to post some useful information...
rupesh.amit
Member
Sir, One end on the coil is connected on the coil and other end(PIN 2) is in the air.
Please ask your questions ,I will not touch it unless you ask me to do
Please ask your questions ,I will not touch it unless you ask me to do
rupesh.amit
Member
Sir, One end of the coil is connected to the board and other end(PIN 2) is in the air.
Please ask your questions ,I will not touch it unless you ask me to do
Please ask your questions ,I will not touch it unless you ask me to do
Resolder ALL BACK on the board.
"Check for pulse at all big coils.
Also check pins 1, 3 & 7 of U1950.
Trigger SMC_ONOFF_L and check for pulse at mentioned points (at same time).
Inspect Q8150 and U1950 areas for corrosion."
No need to write double posts.
Please maintain forum aesthetic...
"Check for pulse at all big coils.
Also check pins 1, 3 & 7 of U1950.
Trigger SMC_ONOFF_L and check for pulse at mentioned points (at same time).
Inspect Q8150 and U1950 areas for corrosion."
No need to write double posts.
Please maintain forum aesthetic...
rupesh.amit
Member
No corrosion detected near Q8150 and U1950 areas
Before trigger SMC_ON_OFF_L
U1950
pins 1: Pulsing
Pin 3: Pulsing
Pin 7: Pulsing
After trigger SMC_ON_OFF_L
U1950
pins 1: Pulsing
Pin 3: Pulsing
Pin 7: Pulsing
Before trigger SMC_ON_OFF_L
U1950
pins 1: Pulsing
Pin 3: Pulsing
Pin 7: Pulsing
After trigger SMC_ON_OFF_L
U1950
pins 1: Pulsing
Pin 3: Pulsing
Pin 7: Pulsing
You didn't understand what trigger SMC_ONOFF_L means.
However, now remove Q8150 and test if get stable voltage on big coils (at least few of them).
However, now remove Q8150 and test if get stable voltage on big coils (at least few of them).
rupesh.amit
Member
SMC_ONOFF_L : It shorted together for a millisecond
Anyways..... I removed Q8150 and still the same situation
No stable voltage any other big coils
Only stable voltage on L7130 and L7560
Anyways..... I removed Q8150 and still the same situation
No stable voltage any other big coils
Only stable voltage on L7130 and L7560
"shorted together for a millisecond"
Yeah, but expected reaction must be checked at same time; in this milisecond!
Not before, nor after.
Keep Q8150 out of board.
Now remove R8164/65/66/68, one by one; keep R8167 on its place.
Tell us when (if) voltage appears on the coils.
Yeah, but expected reaction must be checked at same time; in this milisecond!
Not before, nor after.
Keep Q8150 out of board.
Now remove R8164/65/66/68, one by one; keep R8167 on its place.
Tell us when (if) voltage appears on the coils.
rupesh.amit
Member
Voltage is stable on all the coils
Current : 140 mA
L7130 =8.6V
L7520 = 5.1 V
L7560 = 3.3 V
L7430 = 1.2V
L7630 = 1.05V
L7320 =1.6V
L7310 =1.6V
But it is going in original state sometimes when I plug out and plug it back in to DC supply
Current : 140 mA
L7130 =8.6V
L7520 = 5.1 V
L7560 = 3.3 V
L7430 = 1.2V
L7630 = 1.05V
L7320 =1.6V
L7310 =1.6V
But it is going in original state sometimes when I plug out and plug it back in to DC supply
Last edited:
I said to remove the mentioned resistors one by one and tell us when voltages come on.
Don't you want to help us to diagnose anything on this board???
"when I plug out and plug it back in to DC supply"
Are you using lab PSU, not original Magsafe 2 charger?
Don't you want to help us to diagnose anything on this board???
"when I plug out and plug it back in to DC supply"
Are you using lab PSU, not original Magsafe 2 charger?