820-3474

andrespi

Member
initially this computer did not turn on a green light then change u7090 because 2.2v l7095 g3hot, this board after change ic l7095=3.3v not 3.42, I do not know if it's normal valor.customer took the laptop now the client brought me the laptop with the same problem I measure it gives me 2.2v l7095, change u7090 and measure l7095= 3.37 and power on again.I do not know that value is normal or there is other damage board or customer is doing something wrong
 

2informaticos

Administrator
Staff member
You've said the board started after worked on U7090 area.
If goes bad again, after a while, we can suppose heat reaction affecting some component.

Remove C7095, replace C7094 and R7095/96.
 

andrespi

Member
refers to the heat when change the ic u7090 with my air station can affect other components? with what temperature and air to change components with quick861dw?
 
Last edited:

2informaticos

Administrator
Staff member
The heat may affect some component, which works for short time after that.
Could also be caused by accumulated crap under some BGA chip.

Each hot air station has its settings, which you can adjust testing with scrap boards.
 

andrespi

Member
ok it's fine after changes c7094 R7095,R7096 the 3.42v.But it had sulfated resistance and capacitor,near the smc R5699, C5449 then replace. now it starts but an asd error appears ASD fail sensor ICOR and ISDC I do not know if it was my error or dirt was placed under the smc before I did not have that error
 
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