MBX-216 Vaio laptop dead

[Pragmatiko]

Hi all,

i have that MBX-216 MOTHERBOARD completely dead.

I've seen that from PU2 ic there are 5v but 3v are missing pag.23 of schematic
On PQ8 pin 5:19v 1,2,3:0v 4:0v

RVCC ON pin 27 U2 is 0volt. if i put an external voltage on pin 27 of U2 3volt of PQ8 are present, then i suppose RVCC ON is missing.

Is RVCC ON generated from pin 11 of U18 ?
I have replaced it but still 3 volt are missing.

Any help please...

Tks

[dj_ricoh]

Re: MBX-216 Vaio laptop dead

Sony mbx are notorius for bad caps.

Some of them with bad gpu chipset.
Find the main coils and see witch one its shorted to ground.

[dj_ricoh]

Re: MBX-216 Vaio laptop dead

My bet is if you lify up pl8 right side is shorted.
Check that first and confirm what side is shorted

[Pragmatiko]

Re: MBX-216 Vaio laptop dead

Sony mbx are notorius for bad caps.

Some of them with bad gpu chipset.
Find the main coils and see witch one its shorted to ground.

i found short cap on power board but still dont start.

[dj_ricoh]

Re: MBX-216 Vaio laptop dead

i found short cap on power board but still dont start.

again.

they usually come in pair

find shorted coils or any short to ground. refer to diagram not to be connected o ground.
Some fets are connected to ground o discharge. So please find a reference point so we can continue .