E-Machine G725, LA-4851P

[hansie55]

Hey Guys,

How are you today?

I having a Emachine with a dead USB on both connectors,
and I would like some help.

Page 28 USB Connectors

D23 pin 5 = 0,45V

U28 pin 2+3 = +5V
pin 5 = 3,3V
pin 6,7,8 = 0,45V

The C's and the R's meassure OK

All these 0,45V is the +USB_VCCA

Where is this V comming from or made?

Can someone put me in the right direction?

[atsio]

Re: E-Machine G725, LA-4851P

Replace U28.

[hansie55]

Re: E-Machine G725, LA-4851P

Thanks for the reply. I will do so.
Today I will not have the time, but I 'll com back on it.

[cyberhack]

Re: E-Machine G725, LA-4851P

You missed pin 4 u28, u28 is a Power-Distribution Switch have a look at the data sheet
http://www.ti.com/product/tps2061

[aanan]

Re: E-Machine G725, LA-4851P

check Q26A for [shorting]

[hansie55]

Re: E-Machine G725, LA-4851P

check Q26A for [shorting]

Checked, but no short.

[hansie55]

Re: E-Machine G725, LA-4851P

You missed pin 4 u28, u28 is a Power-Distribution Switch have a look at the data sheet
http://www.ti.com/product/tps2061

You are right, I messured it, but forget to write it down. Now u28 is already taken of the board and I'm waiting for the new one to arive