lenovo yoga 2 13 Check this Out?

[lorins_core]

Hello to all.


Unit Model: Lenovo Yoga2 13
Mobo P/N: ZIVYO LA-A921P REV:2.0 2014-03-03


Status: No Power w/ Voltage on Adapter Drop

Action: First i dismantle the Laptop and Check the Mobo (Mother Board). Then i saw one capacitor Burn.

Here is the Picture



you see the red circle?
identified it is a Capacitor,burn but I do not know its location part number...

Action : 2nd I Remove this Capacitor then i checking and test using ohmmeter for resistance. Positive 0 Ohm (Shorted). Badcaps...

Action: I check the area where the capacitor is connected. may there be any broken parts?i check for short using Ohmmeter. i plug the adapter
result now the adapter is giving the correct voltage. but "No Power"

Now I Used the Science Discovery hehehe (Tuklas Agham in Filipino language) hehehe
Read the Schematic Diagram.

I tracing the rails of 20V Start On DC in to Fuse PF101 to PL101 Have 20.4V then to PQ301 Drain= have 20.4 using Digi tester but Source and Gate 0V
S= 0V?
G= 0V?
D = 20.4

Here is the Picture




Even The PQ303 Source, Gate and Drain. there no Voltage "0V"


I need your Advice For that

Other i Check the PQ301 and PQ303. i test - remove to PCB Negative for Shorted. both Mosfet are Good.
also i change Both Mosfet No Luck .Still Same as Problem


Again I need for Advice... Thanks

[Techtiger]

Re: lenovo yoga 2 13 Check this Out?

What are the Voltage PU301 1.4.5.6.20?
Upload the Schematic

[Techtiger]

Re: lenovo yoga 2 13 Check this Out?

ACFET & RBFET (PQ301 and PQ303) can be turned on the System by ACDRV pin 4 it should be higher than Drain

[on/off]

Re: lenovo yoga 2 13 Check this Out?

Also should be checked PU301 pin 16 LDO REGN since acok signal tied with it.

Maybe if that can flow with super slow motion VCC (pin 20)>>>ACDET (pin6)>>>REGN (pin16)>>>ACOK (pin5)>>>ACDRV (pin4)

Make sure B+ not shorted.

Here is the Picture



you see the red circle?
identified it is a Capacitor,burn but I do not know its location part number...

The shape seem 10uF/25V caps.

Link HD image :
https://drive.google.com/drive/folde...WhaVEtQVHhZV1k


Note: Boardview for this lenovo current unavailable

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

But I curious About This Part Of PQ301 and PQ303.

In Actual Parts installed it is AON7430_PQ301 Same on PQ303.
On Schema Diagram is ISMDV1526URH_PQ301 same on PQ303.

anyway i think it is Same?


Also I update. i check and trace the the PQ304_AO4407A has been open the Source to Drain?

Action: Replace them same 4407A.

[Techtiger]

Re: lenovo yoga 2 13 Check this Out?

But I curious About This Part Of PQ301 and PQ303.

In Actual Parts installed it is AON7430_PQ301 Same on PQ303.
On Schema Diagram is ISMDV1526URH_PQ301 same on PQ303.

anyway i think it is Same?


Also I update. i check and trace the the PQ304_AO4407A has been open the Source to Drain?

Action: Replace them same 4407A.

the 1st 2Mosfets are N-Channel if any short change them check Ohm with out power

What are the Voltage PU301 1.2.3.4.5.6.12.16.20?

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

the 1st 2Mosfets are N-Channel if any short change them check Ohm with out power

What are the Voltage PU301 1.2.3.4.5.6.12.16.20?

Here the result

PU301
Pin 1 = 0V
Pin 2 = 0V
Pin 3 = 0V
Pin 4 = 0V
Pin 5 = 0V
Pin 6 = 2.7V
Pin 12 = 0V
Pin 16 = 0V
Pin 20 = 20.2V

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

the 1st 2Mosfets are N-Channel if any short change them check Ohm with out power

What are the Voltage PU301 1.2.3.4.5.6.12.16.20?

Here the result

* Used Analog Ohmmeter to X10. Leger on test Prove point (R) Red then (B) Black

PQ301 1st. Mosfet

S(R). D(B) = Open
D(R). S(B) = 5 Ohms
S(R). G(B) = Open
G(R). S(B) = 5.5 Ohms
D(R). G(B) = Open
G(R). D(B) = Open

PQ303 2nd. Mosfet Test and Reading Same on PQ301. I think the Both Mosfet haa been Ok.



IC

PU301
Pin 1 = 0V
Pin 2 = 0V
Pin 3 = 0V
Pin 4 = 0V
Pin 5 = 0V
Pin 6 = 2.7V
Pin 12 = 0V
Pin 16 = 0V
Pin 20 = 20.2V



Thanks Again

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

[QUOTE=on/off;874154]Also should be checked PU301 pin 16 LDO REGN since acok signal tied with it.

Maybe if that can flow with super slow motion VCC (pin 20)>>>ACDET (pin6)>>>REGN (pin16)>>>ACOK (pin5)>>>ACDRV (pin4)

Make sure B+ not shorted.



The shape seem 10uF/25V caps.

Link HD image :
https://drive.google.com/drive/folde...WhaVEtQVHhZV1k


Note: Boardview for this lenovo current unavailable.


(Banyak Banyak Terima Kasih Kawan) More Thank You My Friend


accordingly The Pin No.16 0V.
May Be The B+... i try to Check

[Techtiger]

Re: lenovo yoga 2 13 Check this Out?

Here the result

PU301
Pin 1 = 0V
Pin 2 = 0V
Pin 3 = 0V
Pin 4 = 0V
Pin 5 = 0V
Pin 6 = 2.7V
Pin 12 = 0V
Pin 16 = 0V
Pin 20 = 20.2V

Voltage is not correct
Pin 1 = 0V +19V
Pin 2 = 0V +19V
Pin 3 = 0V +19V
Pin 4 = 0V +24V or more
Pin 5 = 0V +3.3V
Pin 6 = 2.7V
Pin 16 = 0V +5V or 6V
Pin 20 = 20.2V

if you have no short in 1st 2 Fets then reflow the IC & see or change the BQ24715

[Techtiger]

Re: lenovo yoga 2 13 Check this Out?

[QUOTE=lorins_core;875611]

Also should be checked PU301 pin 16 LDO REGN since acok signal tied with it.

Maybe if that can flow with super slow motion VCC (pin 20)>>>ACDET (pin6)>>>REGN (pin16)>>>ACOK (pin5)>>>ACDRV (pin4)

Make sure B+ not shorted.



The shape seem 10uF/25V caps.

Link HD image :
https://drive.google.com/drive/folde...WhaVEtQVHhZV1k


Note: Boardview for this lenovo current unavailable.


(Banyak Banyak Terima Kasih Kawan) More Thank You My Friend


accordingly The Pin No.16 0V.
May Be The B+... i try to Check

what that in top of PQ702 is it burn

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

[QUOTE=techtiger;875656]

what that in top of PQ702 is it burn

its Me Again.

About the PQ702 no burn and any physical Damages.
I also i Test Actual on Ohmmeter it is a Good and the PQ701 fine...

Any?

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

Maybe the last Suspected is the Power IC Hmmmmm.

BQ24715 (PU301)

Anyone have know the equivalent or compatible for this IC?

Thank's

[Pferd5]

Re: lenovo yoga 2 13 Check this Out?

not recommended but you could try to bridge pq301 and pq303 so, that you can check if the BQ24715 is working or not.

but I'm a beginner don't take my suggestion as a good advice.

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

not recommended but you could try to bridge pq301 and pq303 so, that you can check if the BQ24715 is working or not.

but I'm a beginner don't take my suggestion as a good advice.

Thank s for you advice.

I already Try you opinion. before. B2B Pq303 Drain to Source... Upsssss

The Voltage Read. on output haveb Fluctuating 8v down the 12. to down....


Thanks Not Luck

[ktmmotocross]

Re: lenovo yoga 2 13 Check this Out?

never inject voltage after second mosfet or bridge this two mosfet before u check it with low voltage. if u have shorted highside mosfet u burn component/ICH, CPU/

[Pferd5]

Re: lenovo yoga 2 13 Check this Out?

of course you should never bridge mosfets that don't have 19-20v output - but this 2 should be 19-20v.

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

of course you should never bridge mosfets that don't have 19-20v output - but this 2 should be 19-20v.

I suspected Parts Problem PU301.

did you know, What is the replacement or equivalent or compatible for this IC?

[lorins_core]

Re: lenovo yoga 2 13 Check this Out?

never inject voltage after second mosfet or bridge this two mosfet before u check it with low voltage. if u have shorted highside mosfet u burn component/ICH, CPU/

Thanks For you Advice....

[dj_ricoh]

Re: lenovo yoga 2 13 Check this Out?

The voltage injected needs to be 1.5v or lower