Turbo-X Quanta QL4 VCORE missing

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

You are right..if was a shorted cap, resistance will be 0.
I have write down all ICs (pu7,u22,pu5,pu4,pu3,pu9,pq26,pq56,pq55) that have a relation with 5VPCU.
My mistake is that i clean all the area before give voltage to avoid extra damage, but i cant remember exactly locations of corruption. Water spilled all over keyboard so 70% of one side of mobo getting wet for sure. I will be out of town for the next 3 days, so i'll continue with the mobo when i get back..at Thursday..so i let you know.
Yper euxaristw gia tin voitheia!! Na eisai kala!

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

Hello again

My trip finally was extended..
I cut the line goes at pin 9-10 of PU6 and short dissapear.
Now i have 0v at 3vpcu and 5vpcu is 3.7 and falling.

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

Today i receive the replacement RT8206B(PU6)

Short finally was at OUT1( pin 10) of PU6, so after replacement i have 5-6 Kohm at +5VPCU, so i replace all broken lines that removed at previous posts, but +VCORE is still 0.3V

Any other idea why Vcore and PU1 PGOOD is low?

[atsio]

Re: Turbo-X Quanta QL4 VCORE missing

What are the voltages now at all pins of PU1?

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

Thanks for reply Atsio,

Voltages without CPU attached:

[atsio]

Re: Turbo-X Quanta QL4 VCORE missing

What are the voltages with CPU?

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

Blue values : WITHOUT CPU
Red values : WITH CPU

[Nightwalker]

Re: Turbo-X Quanta QL4 VCORE missing

Finally problem solved...decide to reflow PU1 before give up and mobo is up and running ok!
:-))
Thanks a lot everyone for your help, especially Atsio!
Kalo kalokairi file!! ;-)