Hp probook 450 g3 not turn on

[arber1232]

hi everyone i have hp probook 450 g3 not turn on .. when i plug charger laptop dc jack turn on with light led and turn on when i press power buton not turn on .. I measure voltage and 19 volt is ok .. 3.3v is ok .. In power buton i have 2.3volt .. In bios i not have voltage ... can i help me .. ask me fore more info you nedd to fix my laptop.. thanks

[Techtiger]

Re: Hp probook 450 g3 not turn on

check the voltage on PU3 PU21 LDO 3/5 and +3/5 VPCU ?

[arber1232]

Re: Hp probook 450 g3 not turn on

check the voltage on PU3 PU21 LDO 3/5 and +3/5 VPCU ?

i dont find wher are thic ic ?

[Techtiger]

Re: Hp probook 450 g3 not turn on

page 50 of the Schematic
https://www.badcaps.net/forum/showth...probook+450+g3

[arber1232]

Re: Hp probook 450 g3 not turn on

i have shcematic but i dont find in board becouse not have words in motherboard

[SMDFlea]

Re: Hp probook 450 g3 not turn on

i have shcematic but i dont find in board becouse not have words in motherboard

Boardview - https://www.badcaps.net/forum/showth...ht=DAX63CMB6C0

[arber1232]

Re: Hp probook 450 g3 not turn on

Boardview - https://www.badcaps.net/forum/showth...ht=DAX63CMB6C0

yess is boarview rightt

[arber1232]

Re: Hp probook 450 g3 not turn on

check the voltage on PU3 PU21 LDO 3/5 and +3/5 VPCU ?

pu3 n Ldo 3.3v and pus21 in pin LDO i have 5 volt
and +3v' 5v vpcu i not understand

[Techtiger]

Re: Hp probook 450 g3 not turn on

Boardview - https://www.badcaps.net/forum/showth...ht=DAX63CMB6C0

arber1232 SMDFlea have send the link to the Bordview
thanks SMDFlea

[arber1232]

Re: Hp probook 450 g3 not turn on

arber1232 SMDFlea have send the link to the Bordview
thanks SMDFlea

i now but i need help to find problem .. it right to have 2.3 v in power buton ?

[SMDFlea]

Re: Hp probook 450 g3 not turn on

+3VPCU voltage

[arber1232]

Re: Hp probook 450 g3 not turn on

+3VPCU voltage

in pu3 i have +3vpcu in pu21 i have 5.3 v
may be bios problem?

[SMDFlea]

Re: Hp probook 450 g3 not turn on

PU21 pin 1 voltage

[arber1232]

Re: Hp probook 450 g3 not turn on

PU21 pin 1 voltage

3.3 v in pin 2 i have 0v its PGOOD

[Techtiger]

Re: Hp probook 450 g3 not turn on

Voltage on Q8 pin 1 2 3? near PWRBTWN

[arber1232]

Re: Hp probook 450 g3 not turn on

Voltage on Q8 pin 1 2 3? near PWRBTWN

pin 1 - 2.3v
pin2-3.2v
pin3-3.3v

[Techtiger]

Re: Hp probook 450 g3 not turn on

remove C28 and check if the 3.3V is back CN5 pin 3

[SMDFlea]

Re: Hp probook 450 g3 not turn on

The Q8 pins are wrong in the schematic - https://www.badcaps.net/forum/showth...ht=DAX63CMB6C0

[SMDFlea]

Re: Hp probook 450 g3 not turn on

3.3 v in pin 2 i have 0v its PGOOD

Check PU21 pin 10, if theres no voltage change PU21 . SY8208C

[arber1232]

Re: Hp probook 450 g3 not turn on

Check PU21 pin 10, if theres no voltage change PU21 . SY8208C

in pin 10 i have 5.4v