Cnx 458 problem on sony vaio

[Alschepmist]

Hi to all (sorry for my bad englisch i speak italian) my problem ist that i have no power and no chrging battery on my sony vaio vpc sa4w9e it see like the cnx 458 dont give out 19 v fuses are okay please help

[bluestone]

Re: Cnx 458 problem on sony vaio

Check for short on the board first

[Alschepmist]

Re: Cnx 458 problem on sony vaio

You are reading of mainboard or cnx 458 because i have no short on mainboard

[caspian]

Re: Cnx 458 problem on sony vaio

Fortunately, the CNX458's schematics file is available:
https://www.badcaps.net/forum/showthread.php?t=53164

First, measure voltage on pins of W_PQ81 and W_PQ82.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

So thats what i v got i hope is understable.

[caspian]

Re: Cnx 458 problem on sony vaio

these measurements do not give any clue. Instead, voltage on pins of W_PQ81 and W_PQ82 are important.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

Direct on the pin are dificult to measaure another way ?

[caspian]

Re: Cnx 458 problem on sony vaio

instead, measure voltage on both sides of W_PC22 and W_PC19 and W_PC10.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

Im in trouble i cannot find the datashet IRFH3707TRPBF i only find IRFH3707PbF but her pin 1.2.3 are G but in the schematich have to be 1 S. 2 G. 3D. Or my fault?

[Alschepmist]

Re: Cnx 458 problem on sony vaio

So i have meauserd w_pq81 and w_pq82 and at w_pq82 at all 6 pin 0 v. at w_pq81 at pin 8 i have got 0.8 volt changing then 0 at pin 7,6,5 0.3 volt

[caspian]

Re: Cnx 458 problem on sony vaio

W_PQ81 and W_PQ82 have no accessible pins. I think you did not measure them properly.
unfortunately, W_PC22 and W_PC19 and W_PC10 are not labeled on the board.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

The pin were accesible for me i used needle but where i can found DC_IN_MOS? Or DC_IN_G1?

[caspian]

Re: Cnx 458 problem on sony vaio

they are connected to W_PC19 which is not labeled. Now, you should measure 19v on at least one pin of W_PQ81. then, make sure you measured the other pins of W_PQ81 and W_PQ82 correctly.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

So definetely DC_IN_MOS are 0 volt i sourced at all the point but still everywere 0

[caspian]

Re: Cnx 458 problem on sony vaio

In addition, measure resistance to GND on all pins of W_PQ81 and W_PQ82 and on the yellow capacitors which are located near W_PQ81 and W_PQ82.
you can replace W_PQ81 as the first try to see what will happen.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

I v got no resistance to gnd it s that normal ? I have no contact w_pq81 and gnd

[caspian]

Re: Cnx 458 problem on sony vaio

yes, it is normal. Now measure resistance between the three pins of W_PQ81. I mean red probe on one pin and black probe on another pin. then, measure resistance between the three pins of W_PQ82.

[Alschepmist]

Re: Cnx 458 problem on sony vaio

So i think the problem is at w_pu2 BQ24725 beacause on pin 1 to 3 i have 0 volt but i should have 19v can be this the problem ?

[Alschepmist]

Re: Cnx 458 problem on sony vaio

And at w_pq81 pin number 3 on the schematic i v got 19 volt

[caspian]

Re: Cnx 458 problem on sony vaio

it can be w_pu2, but w_pq81 seems a more probable suspect. have you got another mosfet of the same model of w_pq81?