lenovo G585 power issue

[vickey_vip]

i have a power problem laptop which model is lenovo g585 and mobo part no is QAWGE LA-8681P REV 1.0.

i check it and found no 3.3 voltage anywhere i check schematic of this motherboard but i cant fine which and where is power ic who generate 3.3 volt please help me
i am attaching schematic which i found

[shuc]

Re: lenovo G585 power issue

If I'm not wrong at page 38, PU301, (BQ24727RGRR)

[vickey_vip]

Re: lenovo G585 power issue

If I'm not wrong at page 38, PU301, (BQ24727RGRR)

you are right but in this location my motherboard have bq727 ic which is for battery charging

[shuc]

Re: lenovo G585 power issue

it's the same IC

[shuc]

Re: lenovo G585 power issue

check for datasheet and you see that 3.3/5V come from this... IC

[shuc]

Re: lenovo G585 power issue

I'm afraid what you said is real. I think real powerIC is PU401, page 39, RT8205EGQW. Sorry for previous post. It's my mistake.

[shuc]

Re: lenovo G585 power issue

http://www.richtek.com/assets/produc...8205ABC-06.pdf

[vickey_vip]

Re: lenovo G585 power issue

I'm afraid what you said is real. I think real powerIC is PU401, page 39, RT8205EGQW. Sorry for previous post. It's my mistake.

in my motherboard pu401 is 033a 56088 is this same ?

[shuc]

Re: lenovo G585 power issue

how many pins have this ic ? It must be like in datasheet.

[vickey_vip]

Re: lenovo G585 power issue

24 pins

[vickey_vip]

Re: lenovo G585 power issue

if this is replacment of RT8205EGQW then i must got VIN voltage on pin no 16 as per RT8205EGQW DATASHEET if yes then i not getting there any volatage

[shuc]

Re: lenovo G585 power issue

So, on pin 16 you haven't 19V ?

[shuc]

Re: lenovo G585 power issue

On pin 8 you must have 3V and on pin 17-5V

[vickey_vip]

Re: lenovo G585 power issue

On pin 8 you must have 3V and on pin 17-5V

how much voltage should be present on pin 16 ?

[shuc]

Re: lenovo G585 power issue

19V, more or less... (from charger)

[shuc]

Re: lenovo G585 power issue

Then, check on pin 17-you must have 5V and on pin 8-3.3V. If yes, check on bios chip. You must have 3.3V. If yes, firs you need to reflash bios. Sorry I have to go for a time...

[vickey_vip]

Re: lenovo G585 power issue

Then, check on pin 17-you must have 5V and on pin 8-3.3V. If yes, check on bios chip. You must have 3.3V. If yes, firs you need to reflash bios. Sorry I have to go for a time...

thanks you for your time ill check and reply you result

[shuc]

Re: lenovo G585 power issue

so, found the problem ?

[vickey_vip]

Re: lenovo G585 power issue

sorry for late update problem can't resolved. so i leave it

[redappleguru]

Re: lenovo G585 power issue

RT8205EGQW is not equal to TPS51123 , replace main power chip which is generate 3.3v and 5v , pu401 = RT8205EGQW=DT=CA,DT=CB, Etc..

then check 3.3v on bios chip pin number 8