00165 ppbus stuck at 4v

Patricia

Member
Hi to you all nice people , Merry Christmas first of all :)
Got a 820-00165 board with no liquid damage or corrosion whatsoever. Had a short on C7430 , replaced it and ppbus went up to 4v (from 0 )
now the board is taking 23 mA and i am stuck :) pp3v42 is ok and i do have green and orange light .
Measured around the U7100 and pin 1 is 0 V , that cant be ok .... so traced back to R7185 and R7186 and they are up to specs .... The voltage there is probably not ok though , on pin 1 R7185 =18.51 and pin 2 =7.51V and the R7186 pin 1 =7.51 and pin 2 = 0 V

The Q7180
pin 1 and 2 = 18.51
pin 3 = 7.51
pin 4 and 5 = 17.95
pin 6 = 17.79

if you had this board would you replace the isl or q7180 ? :)

Thanks in advance
 

2informaticos

Administrator
Staff member
If you get 8.58V at R7150 removing F7140, then no problems on U7100 area.
Resolder F7140 and post diode mode (both directions to ground) at PPBUS_G3H.
 

Patricia

Member
Jesus do i feel stupid ..... I DID check it in the initial stage and it was still ok :) guess it said goodbye during the reparation :)
What can i say besides thank you a thousand times !!!
mark it as solved :)
 
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