Hp dv2000 no display in adapter mode but ok in battry mode

skbasir
Member
Member
Posts: 36
Joined: Thu Jun 16, 2016 3:46 pm
Location: BHUBANESWAR
Contact:

Hp dv2000 no display in adapter mode but ok in battry mode

Post by skbasir »

Hp dv2000 no display in adapter mode but ok in battry mode

Hp dv2000

Board - Akita 945



Power on but no display in adapter mode

In battery mode laptop ok



Diagnosis



If board start with battery then display OK and put adapter also display OK



If remove adapter then once again insert board no display



Steps



Change all the mosfet of adbat and vin section but same isuue



Change charging ic but same issue



Then I check the 51120 ic pg pin11 - 2.9v in battry mode

But 1.8v in adapter mode



So that change the 51120 ic then check same issue



then I cut the track pin 11 from 51120 and 3v generate in pg section

Then check also same issue



This pg voltage is cpucore on voltage so I changed the core ic max8763 also same isuue



Then I checked the core voltage in battry mode is 1.2v but in ac mode.90v



So suspected issue is in vrm core section



Then I change CPU also same issue



After that change all capacitor and mosfet in CPU core section but same issue


After frosted then I add one capacitor behind CPU socket and work done

Now board ok
Attachments
capacitor marked
capacitor marked
Kaibalya das
Newbie
Newbie
Posts: 1
Joined: Wed Jul 20, 2016 6:59 am

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by Kaibalya das »

Nice job sir

[ Post made via Android ] Image
Kaibalya das
Newbie
Newbie
Posts: 1
Joined: Wed Jul 20, 2016 6:59 am

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by Kaibalya das »

Nice job sir

[ Post made via Android ] Image
shlnarang
TOP poster
TOP poster
Posts: 53
Joined: Sat Oct 01, 2016 12:09 pm

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by shlnarang »

useful information
chandra
Member
Member
Posts: 36
Joined: Mon Mar 07, 2016 8:57 am

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by chandra »

niceee sir

[ Post made via Android ] Image
manikodai
Member
Member
Posts: 35
Joined: Mon Oct 03, 2016 2:55 pm

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by manikodai »

beautifully its rare case
thank u sr..
skbasir
Member
Member
Posts: 36
Joined: Thu Jun 16, 2016 3:46 pm
Location: BHUBANESWAR
Contact:

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by skbasir »

thanks to all
mohamedsaid
Member
Member
Posts: 26
Joined: Tue May 10, 2016 1:43 am

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by mohamedsaid »

you are very amazing
minhaj
Newbie
Newbie
Posts: 10
Joined: Tue Mar 15, 2016 12:07 pm

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by minhaj »

nice job sir thanks for shering
gaurav
Member
Member
Posts: 21
Joined: Sun Dec 13, 2015 9:39 am

Re: Hp dv2000 no display in adapter mode but ok in battry mode

Post by gaurav »

Nice job

[ Post made via iPhone ] Image
Post Reply

Return to “Laptop Case Studies”

Who is online

Users browsing this forum: No registered users and 10 guests