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 05-18-2021, 11:04 PM   #1
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Acer A515 Not Charging

Acer A515 motherboard, part number DA0ZAWMB8G. Someone tripped over the charging cord and broke the DC jack. Jack has been repaired, but system still doesn't detect charger.

19V is present on charger pin and drain of #1 mosfet but there is no voltage on the gate and source. There is 19v on a small cap near gate. If battery is plugged in, #2 mosfet measures 10V on drain, nothing on gate.
Mosfets are AON6414A. Datasheet https://datasheetspdf.com/pdf-file/7...ors/AON6414A/1

Measuring in diode mode I don't find any short to ground on any of the surrounding caps.

See attached image.
Attached Images
File Type: jpg PXL_20210519_042236684.jpg (1.24 MB, 35 views)

Last edited by mgrharry; 05-18-2021 at 11:06 PM..
mgrharry is offline   Reply With Quote
Old 05-19-2021, 02:19 AM   #2
mielta
Badcaps Veteran
 
Join Date: Apr 2015
City & State: Neuss
My Country: Germany
I'm a: Knowledge Seeker
Posts: 323
Default Re: Acer A515 Not Charging

Hi

measure on the shutresistor (its the one with R01) if there is short to ground
mielta is offline   Reply With Quote
Old 05-19-2021, 05:51 AM   #3
Sametbey
Badcaps Veteran
 
Sametbey's Avatar
 
Join Date: Jan 2021
City & State: Zonguldak
My Country: Turkey
Line Voltage: 220VAC 50HZ
I'm a: Knowledge Seeker
Posts: 202
Default Re: Acer A515 Not Charging

diagram and sample measurements will help. In order to trigger the N-mosfet at the entrance, it must be 25v at the gate. Check the voltages of the charging chip.
Attached Images
File Type: jpg BQ24738.jpg (238.4 KB, 23 views)
Attached Files
File Type: pdf Acer Aspire A515-51G C5V01 LA-E892P R1A.pdf (1.62 MB, 24 views)
__________________
I'm not happy to be so strong. because it's not humanly
Sametbey is offline   Reply With Quote
Old 05-20-2021, 08:26 PM   #4
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Acer A515 Not Charging

No short to ground on R01
mgrharry is offline   Reply With Quote
Old 05-20-2021, 08:46 PM   #5
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Acer A515 Not Charging

Thanks for the schematic. Unfortunately me and schematics = I tracked down the boardview as well but compared to the Mac board views it's so minimal and disorganized it wasn't much help.

What charging chip are you referring to Sametbey?
mgrharry is offline   Reply With Quote
Old 05-24-2021, 07:49 PM   #6
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Acer A515 Not Charging

Here are some full size photos showing the entire board top and bottom.
Attached Images
File Type: jpg PXL_20210525_014537505.jpg (1,006.1 KB, 13 views)
File Type: jpg PXL_20210525_014528565.jpg (945.3 KB, 12 views)
mgrharry is offline   Reply With Quote
Old 05-24-2021, 08:37 PM   #7
Spider1211
Badcaps Veteran
 
Join Date: Oct 2019
City & State: Morcellement
My Country: Mauritius
Line Voltage: 230VAC, 50Hz
I'm a: Knowledge Seeker
Posts: 413
Default Re: Acer A515 Not Charging

Charging IC is a small black square chip and will have "BQ735" written on it like this: https://www.leakymosfet.com/products...735-735-qfn-20

Find the IC on the board and measure voltage on the following pins and report back:
1. Pin 20 (Vcc)
2. Pin 6 (ACDET)
3. Pin 5 (ACOK)
Spider1211 is offline   Reply With Quote
Old 05-25-2021, 02:07 PM   #8
kiwin
New Member
 
Join Date: May 2021
City & State: Saratov
My Country: Russia
I'm a: Knowledge Seeker
Posts: 11
Default Re: Acer A515 Not Charging

You have a broken power connector. It has 3 contacts. ++19 volts /GND and AD_ID. The AD_ID pin is not triggered in the connector. It should short to GND.
kiwin is offline   Reply With Quote
Old 05-25-2021, 03:43 PM   #9
SMDFlea
Super Moderator
 
Join Date: Jan 2018
City & State: York
My Country: UK
I'm a: Knowledge Seeker
Posts: 7,436
Default Re: Acer A515 Not Charging

Quote:
Originally Posted by mgrharry View Post
Thanks for the schematic. Unfortunately me and schematics = I tracked down the boardview as well but compared to the Mac board views it's so minimal and disorganized it wasn't much help.

What charging chip are you referring to Sametbey?
Your motherboard is a quanta ZAW , i posted the schematic and boardview -

https://www.badcaps.net/forum/showthread.php?t=96065
SMDFlea is online now   Reply With Quote
Old 05-25-2021, 07:58 PM   #10
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Acer A515 Not Charging

Quote:
Originally Posted by kiwin View Post
You have a broken power connector. It has 3 contacts. ++19 volts /GND and AD_ID. The AD_ID pin is not triggered in the connector. It should short to GND.
That makes a lot of sense since this happened right after cord was tripped over. I reflowed the 19v pin but maybe the ID pin is busted internally.
mgrharry is offline   Reply With Quote
Old 05-25-2021, 09:10 PM   #11
mgrharry
Member
 
Join Date: Sep 2016
City & State: los angeles, ca
My Country: usa
I'm a: Knowledge Seeker
Posts: 84
Default Re: Acer A515 Not Charging

No chip labeled BQ735, but I did locate BQ24780S
https://www.ti.com/lit/ds/symlink/bq...=1621969065294

According to that, VCC is pin 28, ACDET pin 6, and ACOK pin 5.
VCC = 19.16V
ACDET = 0V
ACOK = 0V
mgrharry is offline   Reply With Quote
Old 05-26-2021, 08:14 AM   #12
Spider1211
Badcaps Veteran
 
Join Date: Oct 2019
City & State: Morcellement
My Country: Mauritius
Line Voltage: 230VAC, 50Hz
I'm a: Knowledge Seeker
Posts: 413
Default Re: Acer A515 Not Charging

Quote:
Originally Posted by mgrharry View Post
No chip labeled BQ735, but I did locate BQ24780S
https://www.ti.com/lit/ds/symlink/bq...=1621969065294

According to that, VCC is pin 28, ACDET pin 6, and ACOK pin 5.
VCC = 19.16V
ACDET = 0V
ACOK = 0V
I was referring to the initial attached schematic. Per new schematic provided by SMDFlea, charger IC is indeed BQ24780s.

ACDET should be 2.6V. Check if you have continuity (Ideally from ID pin in charger port) between pin3 (ADP_ID) of adapter input (PJ2) and pin2 of PQ17 . Also measure voltage on pin2 of PQ17 and report back.

Since you mentioned tripping over the cable, pretty sure the ADP_ID pin is the issue here.

Last edited by Spider1211; 05-26-2021 at 08:18 AM..
Spider1211 is offline   Reply With Quote
Old 06-18-2021, 12:11 PM   #13
kjchatman
New Member
 
Join Date: Dec 2012
City & State: spring lake/ north carolina
My Country: united states
I'm a: Knowledge Seeker
Posts: 17
Default Re: Acer A515 Not Charging

I have this board and it's dead. i'm wondering if this large chip near the charging port that circled red in the pic is a fuse. it has no continuity and is shorted to ground on one side
Attached Images
File Type: jpg acer1.jpg (286.4 KB, 15 views)
kjchatman is offline   Reply With Quote
Old 06-18-2021, 04:06 PM   #14
mon2
Badcaps Veteran
 
mon2's Avatar
 
Join Date: Dec 2019
City & State: Windsor, Ontario
My Country: Canada
Line Voltage: 110VAC
I'm a: Knowledge Seeker
Posts: 811
Default Re: Acer A515 Not Charging

No. That is a bulk ceramic capacitor. One side is expected to be to ground.

Often, fuses that are surface mounted (like this part) are white in color for the body of the component.

For your repair attempt, start with where the logic board is powered. Then check that the power supply is making it from the external power adapter -> to the power connector -> to the mosfets that will enable / disable to charge up the local battery, etc.

Start with the meter in DC volts mode with black lead to ground. Red lead onto the DC power in jack. Guessing that for this laptop, the DCIN voltage is around 19 Volts and is a round barrel (coax) jack with center pin positive.

The more recent designs are with USB Type C power adapters.
mon2 is offline   Reply With Quote
Old 06-18-2021, 07:01 PM   #15
kjchatman
New Member
 
Join Date: Dec 2012
City & State: spring lake/ north carolina
My Country: united states
I'm a: Knowledge Seeker
Posts: 17
Default Re: Acer A515 Not Charging

i'm getting 19v on pin 1 of bq24780s. shouldn't i get the same on pin 2?
kjchatman is offline   Reply With Quote
Old 06-19-2021, 08:43 PM   #16
kjchatman
New Member
 
Join Date: Dec 2012
City & State: spring lake/ north carolina
My Country: united states
I'm a: Knowledge Seeker
Posts: 17
Default Re: Acer A515 Not Charging

19v is actually on the vcc pin of bq24780s.
kjchatman is offline   Reply With Quote
Old 06-20-2021, 03:20 AM   #17
Sephir0th
Badcaps Veteran
 
Sephir0th's Avatar
 
Join Date: Oct 2020
City & State: Wangerland
My Country: Deutschland
Line Voltage: 230VAC 50Hz
I'm a: Hobbyist Tech
Posts: 258
Default Re: Acer A515 Not Charging

Share the actual issue of your Board, History If available and which measurements you did so far before proceeding with anything.
Sephir0th is offline   Reply With Quote
Old 06-29-2021, 11:40 AM   #18
kjchatman
New Member
 
Join Date: Dec 2012
City & State: spring lake/ north carolina
My Country: united states
I'm a: Knowledge Seeker
Posts: 17
Default Re: Acer A515 Not Charging

it wasn't detecting the charger. I removed pq9 to solve the issue
kjchatman 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 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 12:37 PM.
Did you find this forum helpful?