Samsung NP550 No Chaging

[ukdirtyboy]

Samsung NP550p07c-s05uk
Hi all I have a Np550 that I have in for repair with a faulty charging socket

After replacing the socket, With charger in,the charging light will come on but the battery will not charge or turn the laptop on

if I charge the battery on another laptop the laptop will power on !!!
but if I insert the charger it will show it is charging but it doesn't it loses power until it go's off

i will post a video as soon as i have uploaded to youtube

[ukdirtyboy]

Re: Samsung NP550 No Chaging

Video http://youtu.be/L66YT6JA8a4

[3d0]

Re: Samsung NP550 No Chaging

Thats one strange problem you've got there? Have you checked the charger IC?

[ukdirtyboy]

Re: Samsung NP550 No Chaging

Never had to test one! Could you offer advise on where it's located and how to test it
Thanks

[dj_ricoh]

Re: Samsung NP550 No Chaging

post some pics( macro) of the board.
find some chips like maxim; those makes the battery charge.

[ukdirtyboy]

Re: Samsung NP550 No Chaging

Will do as soon as at work about a hour cheers

[dj_ricoh]

Re: Samsung NP550 No Chaging

ok ! don`t rush
drink your cofee first

[ukdirtyboy]

Re: Samsung NP550 No Chaging

Here are some photos sorry they are not the best

[dj_ricoh]

Re: Samsung NP550 No Chaging

the pic nr 4 you see there BQ735 post the voltage from that chip.

[ukdirtyboy]

Re: Samsung NP550 No Chaging

on pin 1 with battery & charger in but laptop off 11.81v

pin 1 no battery just charger and laptop off 1.08v
with battery in and charger removed laptop off 11.8v

thanks steve

[dj_ricoh]

Re: Samsung NP550 No Chaging

measure all the pins plzzz

[ukdirtyboy]

Re: Samsung NP550 No Chaging

all with psu in and no battery

[ukdirtyboy]

Re: Samsung NP550 No Chaging

voltages on photo above

[dj_ricoh]

Re: Samsung NP550 No Chaging

you need to trace from the power pin(V+) to this chip maybe something its culprit

[ukdirtyboy]

Re: Samsung NP550 No Chaging

the pin to the left of pin 1 is at 18.5volt and a resistances of only 590 ohms from the V= on the dc socket

[ukdirtyboy]

Re: Samsung NP550 No Chaging

anyone?

[3d0]

Re: Samsung NP550 No Chaging

If you could find a schematic that would help.
Just for my curiosity could you measure the voltage at the coil. With Battery in/without AC, then plug in your AC and measure again.