MBX-182, Always ON (3V, 5V) voltages are missing

[Nightwalker]

Hello everyone

I have a VAIO mainboard without "ALWAYS ON" voltages. Laptop was operational before with a broken dj-jack. After disassembly, an inductor fallen from mainboard, without a reason (pressure from my side or hit). I resolder it with a 25W, fine tip, lead free solder. After that, mainboard is dead.
Below the inductor are four MOSFETS, so i am thinking that something has to do with them.
As you can see at attachments, i measure all voltages around power chip..

Fallen inductor was the PL12 and the MOSFETS i'm talking about are PQ40, PQ41, PQ42, PQ43.

Any ideas?

[fddizon]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

try replacing isl3286

[guruji]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

replace the dc-dc ic as the en1 and en2 supply is okay alternate check for 3alw and 5alw short resistance with ground.also check bios.sony vaios have this problem

[Nightwalker]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

Thanks for replies

I think that both of you mean the ISL6236, thats the dc-dc ic, am i right?
5ALW is at pin 10 (OUT1) and 3ALW at pin 30(OUT2)?
I'll check it!
How can i check bios with dead mobo?

[fddizon]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

Thanks for replies

I think that both of you mean the ISL6236, thats the dc-dc ic, am i right?
5ALW is at pin 10 (OUT1) and 3ALW at pin 30(OUT2)?
I'll check it!
How can i check bios with dead mobo?

you need to make 3.3v and 5v ok first before you can check a BIOS

[guruji]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

Pls check the mosfets for short first and replace isl6236 dc to dc controller.should restore your stdby 3.3 and 5 always.let me know i tell you further

[Nightwalker]

Re: MBX-182, Always ON (3V, 5V) voltages are missing

I order them, both mosfets and dc-dc controller. When parcel arrives i'll post here for results! Thanks!