ASUS R517S smd identification

[PC-maniak]

Hi, I'm asking for help identifying the component.. the markings on the smd are totally destroyed and boardview didn't help me much.. I didn't find the schematic ....Thanks!

[mon2]

Post the boardview in the schematic forum and link it here.

Post more pics of this portion of the logic board so we can review the function of this device. Given that there are no inductors nearby, this is not a switching regulator.

It could be a LDO or a load switch.

Update: The posted BV does not appear to match the logic board. Can you confirm it?

[PC-maniak]

the BV is from a different revision, but the connection appears the same, only the components are oriented differently and spaced +- 1mm differently .. according to the description of the connection, it's an SMB temp sensor .. but I'm not sure .. the laptop works normally without this component .. only the fan runs at full speed (this kind of hints that it's CPU temp) but I don't know any smd 5pin temp with SMB - I'm sorry, there should be one more screen shot .. I didn't attach it ups..


EDIT: I can't find the schematic section.. can you direct me? =(

[mon2]

Sure. Here you go:

Schematic Requests ONLY! - Badcaps

Glad you asked before posting it here.

I believe you have done most of the detective work here.

Criteria:

1) package is SOT23-5

2) SMBUS / I2C bus interface (SCL/SDA)

3) Pinout should match yours

4) What is not yet known is which sensor you have (of course) nor the I2C bus address for this sensor. Each SMBUS slave device (like this sensor is or was), has a unique address for the software to ping. Using a low cost bus analyzer you can find out this information because the EC is attempting to ping this slave with retries and then giving up and the fans will run in turbo mode. That is, the absence of this sensor is resulting in the high fan spin.

Will keep searching after a bit of grocery shopping.

[PC-maniak]

I see that someone has already uploaded it -> LINK

[mon2]

Would you have other Asus boards? Asus appears to be in love with the SN170027 thermal sensor but is 6 pin (SOT23-6). They are plastered across many of their boards.

Pin # 4 defines the SMBUS slave address.

[mon2]

So from the BV we know that the ALERT pin is pin # 3.

What is the voltage to ground of pin # 3? Is it low or a logic high?

[PC-maniak]

Unfortunately I do not have .. =( acer .. lenovo ...

EDIT: I have to leave now, but then I'll write how much I measured

[PC-maniak]

pin 3# is 3.38v - HIGH

[mon2]

Run HWInfo to confirm the measurements seen by the sensors or assumed as this sensor is absent. This test will also confirm how many sensors are onboard. Then hunt for the other sensor to observe the topside smd markings. Post the updates and pic of the other sensor.

[PC-maniak]

hello, sorry, I have some obligations now .. after the weekend I will run hwinfo and send the results