Lenovo G550 dead

Post Reply
Swanand
IndiaReFix team
IndiaReFix team
Posts: 19
Joined: Mon Nov 30, 2015 3:03 am

Lenovo G550 dead

Post by Swanand »

Case study...G550 ..
No vin...means 19v was not gating in through second p channel mosfet due to bad charging ic
Fund charging ic was look like bit burnt ...repalce charging ic...vin comes...
Power on no display
Amps. 0.250...0.300
All voltages present
No vcore..
Check vr on...it was present
Check 5v input it was preset
3.3v preset...
Finaly used CT functions to check vcore mosfet gate...One set of Vcore mosfet Gate was ...not Properly shown on CT...
Replace Vcore ic system start working

[ Post made via Android ] Image

[ Post made via Android ] Image
Attachments
Bad ic Graph on CT
Bad ic Graph on CT
Good Ic Graph on CT
Good Ic Graph on CT
esmat-fadak
Guru
Guru
Posts: 182
Joined: Thu Feb 18, 2016 11:32 am
Location: Kabul, Afghanistan

Re: Lenovo G550 dead

Post by esmat-fadak »

nice job
sunilpatel
Member
Member
Posts: 17
Joined: Thu Jun 16, 2016 7:55 am

Re: Lenovo G550 dead

Post by sunilpatel »

good job
Post Reply

Return to “Laptop Case Studies”

Who is online

Users browsing this forum: No registered users and 28 guests