i9505 dead after power switch change
 

Hi guys,
I've a problem with 4x i9505...

After a power switch replacement, all the four i9505 stop working...
not power on...

Any idea? Any solution? What can i check?

Thanks...

what do u use to change hot air? how many A absorb? check u800 like troubleshooting

Hi, thanks for reply...

I've check U501 output voltage (C835=1.225V, C838=1.05V) and is OK...
I've check the U800 output signal (R804=1.8V) and is OK...
I've check the OSC801, and is not working...no 32kHz signal...

Where i can find this OSC? In which other Samsung mainboard? i9100?

PS. I've use a classic solder...no hot air...
And...
When the mainboard is off is absorm 0.1mA, when i turn on it absorb 58mA

Bro, i can't help u
In elettrical spare list don't have specific of this oscillator but maybe u can try on s4 mini cause the supervisor is the same of i9505.... on my experience this problem seems typical on supervisor (u800).....

any similar size 32khz oscillator work. if small size take from I9300,N7100 and if big then from I9100.
check volt & 32khz on tp809 ~.900v aprox.

A rehot with hot air may help?
Or i need to replace it?

1) rehot with hot air
if not work replace it
pls keep us update

I've check with the DSO on tp809, and there is the 32kHz clock...

So, what does mean? That all is ok?
Unfortunately the phone does still not working...

http://s11.postimg.org/6axfh6gf7/IMG...020_083752.jpg

I'll try to rehot u800...

Its not showing exact frequency 32.768khz. In DSO its showing 33.236khz.
change xtal or power ic. When you get exact frequency and still not on then do emmc procedure. you had changed switch so nearest part is wifi so check 1.8v on C214. If shorted then remove wifi IC. then check 1.8v.

Thanks...
I've check C214 and i've found 2.95v!!!
So, i can try to remove the wifi IC or replace U800?


Edit.
I've try to connect the i9505 to a Octolus Jtag, and also the box doesn't recognize the chip...

Problem still remain...
Any idea? :)

It power switch problem,remove power switch n try charging.
If can charging then replace the switch n solder it carefully.