820-01958 liquid damage

[2informaticos]

You can try, just in case.
Be sure U7800 is the one gets hot...

 

[Blackmambo90]

Ok.. finally received my lab psu, ingected some voltage and nothing is heating up
On charger cable plugged in there is only 5v 0.26amps and the PP3v3_G3H is shorted
Any ideas?

 

[2informaticos]

Do you talk about 3V3_G3H (L7690), or 3V3_G3H_RTC (L6960)?
What is the exact ohm value of the short?

 

[Blackmambo90]

Yes, L7690.. super weird...

 

[2informaticos]

"What is the exact ohm value of the short?"

 

[Blackmambo90]

Its 0.5 ohm.. just the leads of my meter give me 0.3

 

[2informaticos]

That's good.
Check continuity between all components; as their values also.

 

[Blackmambo90]

Sorry not sure i understend
0ohm short on 3v3_g3h is good?

On a donor board i have it shows me Kohms..

 

[2informaticos]

My error, I got confused with other thread.

Did you set the amp limit to max on the lab PSU?

 

[Blackmambo90]

Yes, max amps wich is 5amps
5 amps should at least heat up the board if the short is between layers... very strange, i wonder if the psu is working as expected, might check that with a thin wire

 

[Blackmambo90]

Ok i did mesure the current going trough the board and in fact it is 5 amps.. cave no clues at that point

 

[2informaticos]

If PSU has 5A limit, may not inject in fact; got blocked probably.
Get 20A PSU for this purpose.

 

[Blackmambo90]

Cant find a psu with 20amps... is 10amps good ?

 

[2informaticos]

Should be.
Set amp limit to max first.