[SOLVED]820-2879-b

[willie]

Hi friends i have 820-2879-B. Led green, not power on. Voltages are measured and:
[FONT=&quot]PAD POWER 3.40V
BIOS chip PIN 1 3.31 PIN 3 3.32 PIN 8 3.31
SMC_BC_ACOK_VCC =3.39v[/FONT]
[FONT=&quot]SYS_ONEWIRE =3.37v[/FONT]
[FONT=&quot]PP3V42_G3H_ONEWIRE =3.39v[/FONT]
[FONT=&quot]SMC_BC_ACOK = 2.50v[/FONT]

not that other measures have to be verified. Thank you

 

[dukefawks]

Voltage on F7040 and L7220?

 

[willie]

voltage on f7040 and l7220?

f7040 12.5v l7220 3.31v

 

[dukefawks]

Did you use keyboard or did you short the pads to power on?

 

[willie]

Did you use keyboard or did you short the pads to power on?

i did it both ways
.

 

[dukefawks]

Resistance to GND on PP3V42 bus and diode mode on both pins of Y2810?

 

[willie]

Resistance to GND on PP3V42 bus and diode mode on both pins of Y2810?

what you want is that i check impedance between GND and PP3V42, right?
The multimeter show 1230
But i don't have clear about the crystal Y2810, are we talking abouyt impedance too? it both pins repect to GND the impedance is 1368

 

[dukefawks]

Yes between GND and 3V42. 1230 what? Need a value in Ohm or kOhm.
For Y2810 red probe to GND and black to the pins, meter on diode mode.

 

[willie]

No Title

Yes between GND and 3V42. 1230 what? Need a value in Ohm or kOhm.
For Y2810 red probe to GND and black to the pins, meter on diode mode.

1230kOhm are the measures. I have seen that the coil L7260 has a very low resistance 006Ohm to GND, retirement coil and short appears on pin 1 of L7260. inject voltage and heated c6213, c6213 extract the all good! Thans for you time! dukefawks