Badcaps Forums

Badcaps Forums (https://www.badcaps.net/forum/index.php)
-   Troubleshooting Laptops, Tablets, and Mobile Devices (https://www.badcaps.net/forum/forumdisplay.php?f=23)
-   -   Dell inspiron 3521 la-9104p dead (https://www.badcaps.net/forum/showthread.php?t=63872)

mcplslg123 08-10-2017 11:17 PM

Dell inspiron 3521 la-9104p dead
 
Model-Dell Inspiron 3521
M/B-La-9104p rev 1.0(A00)
Problem-Dead

The ene kbc was shorted, so i replaced it with a new one and programmed it as well with Rt809F. unit still has no 3.3v

I have tried the following:

01. Replaced another new kbc and programmed-still same
02. Replaced Pu200 with TPS 51125-still same
03.Replaced Pu100(ISL88731)-still same.
04. There is no short on 3v and 5v coils(PL200 & PL201)
05.Tried flashing both Eprom's-still same.

I have noticed one thing which has left me puzzled--If i connect pin16 of Kbd Connector(which is connected to pin 42 of KBC) to Ground-all voltaged appears on the board-3.3v at battery terminals and power switch. Mb wont turn on simply coz connecting pin 42 of kbc to Gnd means KBC is in programming mode.

So whats wrong???
Please advise friends as i have run out of ideas.

mcplslg123 08-12-2017 01:06 AM

Re: Dell inspiron 3521 la-9104p dead
 
No ideas?? or i'm not clear in my explanation of case?

razu 08-12-2017 03:44 AM

Re: Dell inspiron 3521 la-9104p dead
 
Its so difficult to find out .............laptop repair is tough work, sometimes its bother me

age80 08-12-2017 08:50 AM

Re: Dell inspiron 3521 la-9104p dead
 
https://www.youtube.com/watch?v=rifMj6ne920

Check this video you might find it useful and get some more clues...

jasko_jacker 08-12-2017 10:40 AM

Re: Dell inspiron 3521 la-9104p dead
 
1 Attachment(s)
This is schematic and bios dump,
have you a short on 3.3v <-- EC ?

jasko_jacker 08-12-2017 10:54 AM

Re: Dell inspiron 3521 la-9104p dead
 
1 Attachment(s)
I remember a similar issue on a thinkpad solved with a pch reflow but in this case you should , In this case you should try to separate 3.3V 5V block from its loads

raajkumar 08-12-2017 08:58 PM

Re: Dell inspiron 3521 la-9104p dead
 
Check at PL600 & PL601 for short circuit. And also PU600.

mcplslg123 08-14-2017 12:07 AM

Re: Dell inspiron 3521 la-9104p dead
 
Quote:

Originally Posted by jasko_jacker (Post 764243)
This is schematic and bios dump,
have you a short on 3.3v <-- EC ?

No short on 3.3v ec

mcplslg123 08-14-2017 12:07 AM

Re: Dell inspiron 3521 la-9104p dead
 
Quote:

Originally Posted by raajkumar (Post 764354)
Check at PL600 & PL601 for short circuit. And also PU600.

Both the coils are not shorted to Gnd. Checked with a working board. Pu600 is fine

raajkumar 08-14-2017 01:14 AM

Re: Dell inspiron 3521 la-9104p dead
 
i had the same issue on a motherboard. but i don't remember which resistor is damaged. so check resistors around pu200.

smali 08-14-2017 05:58 AM

Re: Dell inspiron 3521 la-9104p dead
 
check RE4 and RE1

anandkv123 07-30-2018 10:56 AM

thanks

jijunmedia 07-19-2019 07:15 AM

Re: Dell inspiron 3521 la-9104p dead
 
dears i have a problem dell 15-3521la-9104p)
it showing the massage battery not identifed system unable to charge
i change battery ,charger
chargig ic
3,5 ic
all starting /charging mosfets
near charging ic components
pch bios 32/io,bios16 bios programmed
io chip kb012qf changed and programmed
but no chance please help me friends

mcplslg123 07-19-2019 10:45 PM

Re: Dell inspiron 3521 la-9104p dead
 
Can u run the laptop only on charged battery?? Check for shorted caps on battery output lines. What about PS_ID??

whitevolf 12-12-2019 01:19 AM

Re: Dell inspiron 3521 la-9104p dead
 
thanks

mcplslg123 12-12-2019 07:56 AM

Re: Dell inspiron 3521 la-9104p dead
 
Quote:

Originally Posted by jijunmedia (Post 906099)
dears i have a problem dell 15-3521la-9104p)
it showing the massage battery not identifed system unable to charge
i change battery ,charger
chargig ic
3,5 ic
all starting /charging mosfets
near charging ic components
pch bios 32/io,bios16 bios programmed
io chip kb012qf changed and programmed
but no chance please help me friends

This sort of "hit and trial" approach makes things worse and sometimes render the mb unrepairable. Identify the fault first, understand the circuit or seek help in the forum instead of killing mb's.

djharold 02-06-2020 12:38 PM

Re: Dell inspiron 3521 la-9104p dead
 
thanks

hussaka 03-19-2020 01:34 PM

Re: Dell inspiron 3521 la-9104p dead
 
Thank you

ycok 06-30-2020 05:56 AM

Re: Dell inspiron 3521 la-9104p dead
 
Thank you

scarts4 08-31-2020 12:33 PM

Re: Dell inspiron 3521 la-9104p dead
 
Thanks a lot guys.


All times are GMT -6. The time now is 02:08 AM.

Powered by vBulletin ®
Copyright ©2000 - 2022, Jelsoft Enterprises Ltd.