820-4924 no power, PP5V_S3RS0_ALSCAM_F missing

[2informaticos]

What about PM_SLP_S3_BUF_L?

 

[omiran]

PM_SLP_S3_BUF_L is 0V

 

[omiran]

Hello Dear friend,

I'm skeptical about replacing the suspected chip (U8180). Considering a basic note on Rossman's Training guide that pointed not to replace IC that does not have voltage at an"Enable" pin, the pin may have not been told to come on. If yes can you please identify chip responsible to turn on the missing pin (P5VS0_EN) at U8180.

 

[2informaticos]

How do you think U8180 works???

Google Search

www.google.com

Be sure to have power at pin 5 first...

 

[omiran]

There is power at pin 5 - 3.3V. Does that mean I go ahead with the replacement?

 

[2informaticos]

I was thinking is already changed now...

 

[omiran]

It has been changed but the same thing. P5VS0_EN still missing. PM_SLP_S3_BUF_L still 0V.

 

[2informaticos]

"PM_SLP_S3_BUF_L still 0V"
Post diode mode there.

If pins 1, 2 & 5 are high, then pin 4 must be high too; already passed links about how such chip works.

 

[omiran]

pin 1 and 2 reads 1.21, pin 5 reads 3.32 but pin 4 reads 0V... Does it mean that my case is a rare one?

 

[2informaticos]

"PM_SLP_S3_L reads 3.32V
-----------
pin 1 and 2 reads 1.21"
Check R8178...

 

[omiran]

R8178 reads 3.32V. i'm surprised why I get 3.32V on R8178 and PM_SLP_S3_L pin 1 and 2 will read 1.21V. What's missing here?

 

[2informaticos]

Looks like U8180 has some internal problem, change it.
Be sure first, R8178 has correct 100 ohm value.

 

[omiran]

Just curious. "PM_SLP_S3_BUF_L” produces P5VS0_EN right?

 

[2informaticos]

It is splited in various enable signals, as per schematic...

 

[omiran]

R8178 reads 99.7ohms

 

[2informaticos]

Did you change U8180???

 

[omiran]

Yes I did. But no 0V at PM_SLP_S3_BUF_L still

 

[2informaticos]

I tried to explain you several times; the output depends of input states.
Did you read something from the Google results???
Do you have 3V at both pins 1 & 2?