820-00165 fan spins for 5 seconds then off

[Kyle93]

820-00165 with minor liquid damage in LCD connector area.

board turns on for about 5 seconds then turns off and nothing else happens. Rest of board is very clean.

Wat to check first?

 

[2informaticos]

Clean affected area first.
Do you get all voltages in the 5s when board stays on?

 

[Kyle93]

affected area has been cleaned up.

Yes I have all 5V voltages when board is on

 

[2informaticos]

"all 5V voltages"
I was reffering to ALL voltages (in the 5s ON time ), especially on the big coils....

 

[Kyle93]

I do not see anything in the schematic that refers to 5S power rails. Are you referring to ALL of the power rails in schematic while the board is on like all of the 3.3V 12.6V 5V rails e.t.c

 

[JohnB8812]

Yes he means are ALL VOLTAGES present in the 5 seconds the board is powered on

 

[2informaticos]

You can try new BIOS, but check first if you get all voltages, including VCORE.
Also test the board alone, disconnecting LIO flex and other devices.

 

[JohnB8812]

Sounds like a bad CPU to me. Have seen that issue of on off on way too many times. BIOS would be only hope imo being liquid was near there

 

[Kyle93]

Bios from donar board of had exact symptoms. I think John is right bad CPU at this point. I replaced everything I could find under microscope that looked like it got hit with liquid but still no change.

This was also cleaned before I got it.

 

[2informaticos]

Did you check all voltages from pages 57/58?

 

[JohnB8812]

It?s one of the failures I see on 00164/5 a lot idk why it fails that way

 

[Kyle93]

Yes, they are all present during first power cycle and the second cycle. During 2nd cycle it stays at a steady 590 miliamps. Must be CPU now.

 

[2informaticos]

As the latest option, put good flux and heat CPU/PCH to 200 degrees.
Also find a good pray...