Asus Vivobook - help identifying component

[FriedFred]

Hi! 98 Ohm and 60 Ohm is not a dead-short, I think. Is there any data traffic on this lines?
If a low-ohmic resistor gets shorted, usually it get's blown-up. And therefore, measure a much higher resistance.
But here, it seems to me, that something else keeps those lines down.

[magneh]

Hi! 98 Ohm and 60 Ohm is not a dead-short, I think. Is there any data traffic on this lines?
If a low-ohmic resistor gets shorted, usually it get's blown-up. And therefore, measure a much higher resistance.
But here, it seems to me, that something else keeps those lines down.

Yes, not a dead short, but indeed low.

I can only track the SMBUS lines , data and clock, passing through those two 0ohm resistors , then the ESD 6 leg IC, then to charger IC, and finally to the ITE chip.

Ive changed all of these components, and never got higher resistance than this one ...

What a head hache

[mon2]

Suggestions:

a) flux and remove the 2 * 0R series resistors on the SMBUS lines. After their removal, which side is showing the low resistance to ground? Is it the battery connector or the charger side?

b) remove the ESD protection device on these lines (if still onboard). Test the resistance to ground again.

c) do not have the laptop battery attached so we can rule out the BMS board on the battery pack as a suspect

d) although should not be a factor but by design, the SMBUS lines should also have local pull-up resistors on each.

e) when checking in diode mode, the red probe is to ground with black probe for testing the pin(s)? The low resistance confirms there is a fault. If a manual meter, be sure the meter scale is correct and that the shared measurements are truly under 100R = 100 ohms for each.

[magneh]

Suggestions:

a) flux and remove the 2 * 0R series resistors on the SMBUS lines. After their removal, which side is showing the low resistance to ground? Is it the battery connector or the charger side?

b) remove the ESD protection device on these lines (if still onboard). Test the resistance to ground again.

c) do not have the laptop battery attached so we can rule out the BMS board on the battery pack as a suspect

d) although should not be a factor but by design, the SMBUS lines should also have local pull-up resistors on each.

e) when checking in diode mode, the red probe is to ground with black probe for testing the pin(s)? The low resistance confirms there is a fault. If a manual meter, be sure the meter scale is correct and that the shared measurements are truly under 100R = 100 ohms for each.

Hey mon2

a) OL on the battery connector. Same low resistance on charger side.

b) was already off the board. same resistance

c) I never had the baterry connected during any measurements

d) I couldnt find those

e) yes, always red probe on ground when measuring in diode mode. yes meter is in correct scale

[mon2]

Measure the resistance from start of the SMBUS lines at the removed 0 ohm resistors to the EC (bus master). Do you have ~0R = 0 ohms? Repeat for both lines.

[magneh]

Measure the resistance from start of the SMBUS lines at the removed 0 ohm resistors to the EC (bus master). Do you have ~0R = 0 ohms? Repeat for both lines.

Hi mon2

Its a BGA ITE IC, I need to dessolder it to measure

[FriedFred]

You exchanged the charger IC? Did you measure the shorts also without the assembled IC?

[magneh]

You exchanged the charger IC? Did you measure the shorts also without the assembled IC?

Hey FriedFred!

Yes, twice.

I did measure , low resistance was the same without the charger IC soldered back...

Maybe I remove ITE and charger IC and measure the resistance again, but I think I did it once and same values.
But I can double check if it makes move forward...

Cant see this board anymore

[magneh]

I took the board out again.

Before removing the charger IC and EC chip, I measured the voltage in the SMBUS lines. I see 0.2V then it goes to 1.5 V , decreases and comes back to 0.2 . With an osciloscope I would be able to catch this more clearly...

[FriedFred]

This is not so bad, so something pulls at these pins and leaves them. At least, with a oscilloscope, there shall be any traffic because other ICs also use this interface. Battery, for example, EC chip, etc.
Without the charger IC, those SMBUS lines, in the direction of the battery, shall be always HIGH. At least without the battery.

[AROSOFT]

Hola, Saludos Colegas, espero se encuentren bien, Comentarles que tengo la Asus, K3704V, con el mismo problema, se le cambio el ic de carga, y el ESD de 6 patillas y la laptop enciende, no carga, y al iniciar suele apagarse de 2 de cada 10 veces, justo cuando esta iniciando, lograron solucionar este problema?

[mon2]

..

Hello, Greetings Colleagues, I hope you are well. Let me tell you that I have the Asus, K3704V, with the same problem, the charging IC was changed, and the 6-pin ESD and the laptop turns on, does not charge, and when starting it usually turns off 2 out of 10 times, just when it is starting up, did you manage to solve this problem?