Badcaps.net Forum
Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > Troubleshooting Laptops, Portable, and Mobile Devices
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 01-22-2019, 04:29 PM   #1
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Acer 5760G - Quanta ZRJ dead, no power

Hi guys,

I'm trying to fix the laptop above. I have 19v I'm pretty sure, and I have 3v at certain places but not on the power button. This is super weird since I have 3v on one of the other buttons near it, the IC's near the power button are also missing 3v but some have 1.8 and 1.5v. The weirdest thing is that when i short two pins on the ic in thr picture the fan starts spinning but nothing else, when i dont short it, the fan has no voltage at its connector.

Please help, also does anyone have the boardview for this quanta ZRJ, I cant find it anywhere.
Attached Images
File Type: jpg IMG-20190123-WA0002.jpg (47.4 KB, 10 views)
File Type: jpg IMG-20190123-WA0001.jpg (138.4 KB, 11 views)
File Type: jpg IMG-20190123-WA0000.jpg (160.8 KB, 13 views)
MARHD is offline   Reply With Quote
Old 01-22-2019, 06:20 PM   #2
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

I forgot to mention that the power button has 1-1.2v instead of 3v
MARHD is offline   Reply With Quote
Old 01-22-2019, 06:40 PM   #3
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

And here is the schematic if it helps
Attached Files
File Type: pdf 85329_Quanta_ZRJ.pdf (1.35 MB, 25 views)
MARHD is offline   Reply With Quote
Old 01-23-2019, 03:07 AM   #4
mielta
Badcaps Veteran
 
Join Date: Apr 2015
City & State: Neuss
My Country: Germany
I'm a: Knowledge Seeker
Posts: 280
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Hi
Messure the Powerbutton if he works OK . Multimeter on Ohm
Or desolder it and than messure again
mielta is offline   Reply With Quote
Old 01-23-2019, 04:02 AM   #5
techtiger
Badcaps Veteran
 
Join Date: Oct 2014
City & State: paris
My Country: france
I'm a: Knowledge Seeker
Posts: 773
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by MARHD View Post
I forgot to mention that the power button has 1-1.2v instead of 3v
mesure Voltage R18 both side's
mesure Voltage R418 both side's
techtiger is offline   Reply With Quote
Old 01-23-2019, 04:08 AM   #6
techtiger
Badcaps Veteran
 
Join Date: Oct 2014
City & State: paris
My Country: france
I'm a: Knowledge Seeker
Posts: 773
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by MARHD View Post
Hi guys,

I'm trying to fix the laptop above. I have 19v I'm pretty sure, and I have 3v at certain places but not on the power button. This is super weird since I have 3v on one of the other buttons near it, the IC's near the power button are also missing 3v but some have 1.8 and 1.5v. The weirdest thing is that when i short two pins on the ic in thr picture the fan starts spinning but nothing else, when i dont short it, the fan has no voltage at its connector.

Please help, also does anyone have the boardview for this quanta ZRJ, I cant find it anywhere.
for the fan U21 power the fan power mesuer pin 2 for vin
techtiger is offline   Reply With Quote
Old 01-23-2019, 06:10 AM   #7
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

The power button is working, the 1 volt drops to 0 if i preas it
MARHD is offline   Reply With Quote
Old 01-23-2019, 06:12 AM   #8
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by techtiger View Post
mesure Voltage R18 both side's
mesure Voltage R418 both side's
I can't find them, and I don't have the boardview to do so
MARHD is offline   Reply With Quote
Old 01-23-2019, 06:15 AM   #9
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by techtiger View Post
for the fan U21 power the fan power mesuer pin 2 for vin

The u21 is missing 5v, I'm not sure which is pin 2 but i checked all the pins and very low voltage on all pins, below 1v
MARHD is offline   Reply With Quote
Old 01-23-2019, 06:19 AM   #10
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Just to make sure, which are the two mosfets i can check for 19v on?
MARHD is offline   Reply With Quote
Old 01-23-2019, 09:26 AM   #11
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Ok for the one switch that was 3v it is now also 1v, not sure why. Also the led above the power switch has 3v, which is odd since it is so close
MARHD is offline   Reply With Quote
Old 01-23-2019, 09:40 AM   #12
techtiger
Badcaps Veteran
 
Join Date: Oct 2014
City & State: paris
My Country: france
I'm a: Knowledge Seeker
Posts: 773
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by MARHD View Post
I can't find them, and I don't have the boardview to do so
in your Mob R18 not present
check pin 95 U22 SIO IC for NBSWON 3.3V
Check pin 19 & 102 u22 IC FOR 3.3V
Check PL 14 +3VPCU is stable

Last edited by techtiger; 01-23-2019 at 09:43 AM..
techtiger is offline   Reply With Quote
Old 01-23-2019, 10:29 AM   #13
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

PL14 has stable 3.3v on both sides.
Pin 95 of u22 has 1v.
Pin 102 of u22 has 2.5v
Pin 19 of u22 has 2.5v
But pin 93 of u22 has 3.3v
MARHD is offline   Reply With Quote
Old 01-23-2019, 12:23 PM   #14
techtiger
Badcaps Veteran
 
Join Date: Oct 2014
City & State: paris
My Country: france
I'm a: Knowledge Seeker
Posts: 773
Default Re: Acer 5760G - Quanta ZRJ dead, no power

you have to find out R418 & test input side for 3.3V it's near the SIO U22 near pin 19 & 102
send a cloe up PIC of that area it's near L26 Coil, there is a Voltage Drope, SIO nead 3.3V
Check your Bios Pin 8 for 3.3V U23

Last edited by techtiger; 01-23-2019 at 12:40 PM..
techtiger is offline   Reply With Quote
Old 01-23-2019, 01:14 PM   #15
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

R418 has 3.3v on the U22 side, and 2.5v on the other side.
I checked the Bios pin 8 on the C586 capacitor, and it was 3.3v, the other side of the cap was low voltage. you can see on the pic
Attached Images
File Type: jpeg super io and bios.jpeg (182.1 KB, 13 views)
MARHD is offline   Reply With Quote
Old 01-23-2019, 01:29 PM   #16
ktmmotocross
Boardkiller
 
ktmmotocross's Avatar
 
Join Date: Feb 2014
City & State: slovakia
My Country: slovakia
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 1,749
Default Re: Acer 5760G - Quanta ZRJ dead, no power

this can be shorted SIO or some output that draining too much current

remove l26 coil and other capacitors to be sure it is SIO that pulling that line down

Last edited by ktmmotocross; 01-23-2019 at 01:30 PM..
ktmmotocross is offline   Reply With Quote
Old 01-23-2019, 01:35 PM   #17
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by ktmmotocross View Post
this can be shorted SIO or some output that draining too much current

remove l26 coil and other capacitors to be sure it is SIO that pulling that line down
which other capacitors?
and what do you want me to test once i remove it?
MARHD is offline   Reply With Quote
Old 01-23-2019, 02:00 PM   #18
ktmmotocross
Boardkiller
 
ktmmotocross's Avatar
 
Join Date: Feb 2014
City & State: slovakia
My Country: slovakia
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 1,749
Default Re: Acer 5760G - Quanta ZRJ dead, no power

on the side of that resistor where is voltage pulled down is not connected only SIO. so isolate that line from other components to be sure that SIO is the component that pulling voltage down
ktmmotocross is offline   Reply With Quote
Old 01-23-2019, 02:06 PM   #19
MARHD
Member
 
Join Date: Jul 2018
City & State: Cape Town
My Country: South Africa
Line Voltage: 230V, 50HZ
I'm a: Knowledge Seeker
Posts: 40
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by ktmmotocross View Post
on the side of that resistor where is voltage pulled down is not connected only SIO. so isolate that line from other components to be sure that SIO is the component that pulling voltage down
So remove L26 and C579? and then check the resistor again? Or remove all of these caps also?
Attached Images
File Type: png caps.PNG (30.2 KB, 5 views)

Last edited by MARHD; 01-23-2019 at 02:08 PM..
MARHD is offline   Reply With Quote
Old 01-23-2019, 02:09 PM   #20
techtiger
Badcaps Veteran
 
Join Date: Oct 2014
City & State: paris
My Country: france
I'm a: Knowledge Seeker
Posts: 773
Default Re: Acer 5760G - Quanta ZRJ dead, no power

Quote:
Originally Posted by ktmmotocross View Post
this can be shorted SIO or some output that draining too much current

remove l26 coil and other capacitors to be sure it is SIO that pulling that line down
is that R418 faulty ?
Attached Images
File Type: jpg acer.jpg (120.3 KB, 14 views)
techtiger is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 02:03 AM.
Did you find this forum helpful?