lenovo yoga 500-141BD power goes off a few sec

[rickybucalan]

hello guys....need your help

i got lenovo yoga 500

LT41 MB 14217-1M

it turn on a few sec then off.

[YOUN]

Re: lenovo yoga 500-141BD power goes off a few sec

Hi.help me to found bios for lenovo x130 da0fl8mb8c0 rev c
thank!

[SMDFlea]

Re: lenovo yoga 500-141BD power goes off a few sec

Hi.help me to found bios for lenovo x130 da0fl8mb8c0 rev c
thank!

This post is about a yoga 500-141BD ,why don`t start a new thread in the "Bios Requests" ,its highlighted in red .

[johnbad]

Re: lenovo yoga 500-141BD power goes off a few sec

hello guys....need your help

i got lenovo yoga 500

LT41 MB 14217-1M

it turn on a few sec then off.

Does it have "Lenovo" splash screen when it's powered on?

[rickybucalan]

Re: lenovo yoga 500-141BD power goes off a few sec

Does it have "Lenovo" splash screen when it's powered on?

no

[rickybucalan]

Re: lenovo yoga 500-141BD power goes off a few sec

updates ..

i tried new battery and its work with the battery only..
but not charing.

not working with charger.

checked charger " good"

checked charging pin "good"

checked voltage in mobo 20v "good"

what is wrong guys...pls help

[Techtiger]

Re: lenovo yoga 500-141BD power goes off a few sec

updates ..

i tried new battery and its work with the battery only..
but not charing.

not working with charger.

checked charger " good"

checked charging pin "good"

checked voltage in mobo 20v "good"

what is wrong guys...pls help

Upload the Schematic if you can
What is your Charger IC BQxxx or ?

[rickybucalan]

Re: lenovo yoga 500-141BD power goes off a few sec

Upload the Schematic if you can
What is your Charger IC BQxxx or ?

cant find schematic..


charger ic is isl 95520HRZ

[Techtiger]

Re: lenovo yoga 500-141BD power goes off a few sec

cant find schematic..


charger ic is isl 95520HRZ

cannot find the datasheet for this test all pins for VIN with out battrey it's other side of the MOB

[SMDFlea]

Re: lenovo yoga 500-141BD power goes off a few sec

The Compal LA-D071P has a ISL95520HRZ (PU703) on page 4 of the schematic ,and on page 42 as ISL95521HRZ (PU703).



LT41 MB High res images:
https://drive.google.com/open?id=0Bw...ldBMDNiU0FaWXM

[Techtiger]

Re: lenovo yoga 500-141BD power goes off a few sec

The Compal LA-D071P has a ISL95520HRZ (PU703) on page 4 of the schematic ,and on page 42 as ISL95521HRZ (PU703).



LT41 MB High res images:
https://drive.google.com/open?id=0Bw...ldBMDNiU0FaWXM

Thanks SMDFlea

[Techtiger]

Re: lenovo yoga 500-141BD power goes off a few sec

cant find schematic..


charger ic is isl 95520HRZ

ISL95520HRZ test pin 1.2.30.32

[rickybucalan]

Re: lenovo yoga 500-141BD power goes off a few sec

ISL95520HRZ test pin 1.2.30.32

pin 1 = 2.9v
pin 2 = ov
pin 30 =0v
pin 32=19v

[Techtiger]

Re: lenovo yoga 500-141BD power goes off a few sec

pin 1 = 2.9v
pin 2 = ov
pin 30 =0v
pin 32=19v

Now test your 1st 2 Mosfets for voltage in all pins and for short in Diode mode multimeter without power or Battery

[bogdan039]

Re: lenovo yoga 500-141BD power goes off a few sec

The same issue , the same model.
In pin 18 at ISL95520HRZ is one resistor 10 ohm.
In found this resistor with big resistance,about 80k ohm.
On pin 18 shoul be about 19v but was just 16v.
PR743=10 ohm on Compal LA-D071P.

[siroos_tz]

Re: lenovo yoga 500-141BD power goes off a few sec

The Compal LA-D071P has a ISL95520HRZ (PU703) on page 4 of the schematic ,and on page 42 as ISL95521HRZ (PU703).



LT41 MB High res images:
https://drive.google.com/open?id=0Bw...ldBMDNiU0FaWXM

Thanks

[palady]

Re: lenovo yoga 500-141BD power goes off a few sec

Yap you are good. I have board lt41-14271 YOGA with the same chip PIN 18, VERY LOW VOLTAGE (must be DCin adapter or battery). I found bad resistor (PR4437) 2.2 ohm.

[mon2]

Re: lenovo yoga 500-141BD power goes off a few sec

The low resistance may be normal and is for a current sense resistor. Can you link a schematic if you have one?

Which pin has this resistor?

Yes, the dcin should not be low. Remove all power and review to locate mosfets that will be nearby. The mosfets are like solid state relays that pass the voltage from your dcin adapter to this ic but only if the gate pin is the correct voltage.

Share full details of the mosfet markings so we can check if the mosfets are N-channel or P-channel.

Which logic board are you repairing? Post all details.

[gokhankelebek]

Re: lenovo yoga 500-141BD power goes off a few sec

ISL95520HRZ test pin 1.2.30.32

ISL95520HRZ There is a 3.2k resistor in front of the 18th leg output, remove it, insert a 10 or 20 ohm resistor, the battery will start charging