820-2879 not turning on

[Kyle93]

Have a 820-2879 board that had mild water damage. After replacing u7000 and everything else that had corrosion I now get a green light and the board attempts to power on when pads are shorted but still no fan spin.

ALL_SYS_PWRGD is 0.871 V and cpu/gpu get warm without a heatsink.

Could this be a smc issue?

 

[2informaticos]

ALL_SYS_PWRGD is pulsing, or steady 0.97V?

CPU/MCP get hot even without trying to power on?
That's no good at all.

F7040 voltage?

 

[Kyle93]

ALL_SYS_PWRGD is 0V when system off. When turning on its a steady 0.871V

CPU/MCP only get hot when turning the board on by shorting pads

F7040 12.60V

 

[2informaticos]

So board turns on.
Do you get voltage at any big coil?

 

[Kyle93]

L7260 5v

l7030 12.60v

 

[2informaticos]

Nothing on L7220???

"L7260 5v"
Means PM_SLP_S4_L comes high.
So other voltages should be present; the ones controlled by that signal.
As DDR voltage, for example...

Also check if PM_SLP_S3_L is high.

 

[Kyle93]

PM_SLP_S3_L 3.332v

 

[Kyle93]

L7220 3.332v

 

[2informaticos]

"PM_SLP_S3_L 3.332v"
Means board is now in S0 state...

Please post voltage on ALL coils of the board.

 

[Kyle93]

After closer inspection i didn't like the way u7500 looked so replaced it.

I have fan spin now but its not booting up fully. When I turn it on the sleep light blinks once and nothing else happens. What can cause this?

 

[Kyle93]

please respond, what does the 1 blinking light mean with fast fan spin?

 

[2informaticos]

"Please post voltage on ALL coils of the board."
Please respond...

 

[Kyle93]

L7710 1.521v

L9701 0V

L6995 3.435v

L7620 1.073v

L7750 0.917v

L7560 0.956v

L7030 11.77V

L7330 1.520V

L7401 1.168V

L7400 1.168v

L7220 3.331V

L7260 5.07V

 

[2informaticos]

Did you try only one module DDR3-8500 at a time, each slot?

 

[Kyle93]

yes, when using the bottom slot the sleep light will blink once and when using top slot it will blink three times

 

[2informaticos]

Does it beep RAM error if starts without any RAM module?

 

[Kyle93]

without any ram installed the light will blink once every few seconds but no beeping sounds