820-00165 Liquid damage

[RyanLEN]

Hi - Have board with liquid damage on DC In board and corrosion on upper right side of main board to the right of CPU. Replaced DC In board and everything was working. After cleaning now I get no PP5V_SO.

 

[RyanLEN]

In Other News: Just plugged it back in and its working again. ??? Thanks in advance.

 

[smiba]

Is there a light on the charger? Voltage on PP5V_S5?

 

[RyanLEN]

update: Yes, light on charger. Its off and on again. Thanks.

 

[RyanLEN]

And to answer your first question. No PP5v_s5

 

[RyanLEN]

Sorry. I do now have PP5V_S5

 

[smiba]

Does the board show any signs of life other then the charging light? Is there a fan spin?

How is PP3V3_S5 and PP3V3_S4 doing?

Also I assume you've already cleaned up the corrosion on the upper right of the CPU?

 

[dukefawks]

I bet pin 8 of U1950 is corroded.

 

[RyanLEN]

Oh yea...there's life. The entire board will work fine. It even boots. Then I unplug charger and plug back in and it will be dead. Ill start probing around and all of a sudden it turns on again. I did clean the corrosion because I wrongfully assumed it was working but I know where the damage was. All other rails are good. I will check again tomorrow in the AM. Thanks for your responses guys. Have a good one!

 

[RyanLEN]

Hi. Checked this morning around U7200. Getting 8.5 V in to pin 17. Nothing on pin 10 or pin 1.

 

[RyanLEN]

pin 8 on u1950 looks ok

 

[dukefawks]

No idea, this will be corrosion under somewhere. Only you saw where the corrosion was, I cannot help in this case. Simple fact is is the CPU power in not coming on all rails will start cycling and you should be able to see that on 5V_S0 bus.

 

[RyanLEN]

All set here. Thanks for your time.

 

[dukefawks]

Did you find something?

 

[RyanLEN]

Besides throwing dirty looks its way from across the room, no.