A1466 820-3437-B no power

[hgoncalves]

Hi,
I have an A1466 820-3437-B with no power
it has green light, fan speed, pulls 500mA from bench PSU, but no usb activity.

L7320:
1= 1,49V
2=1.74V

L7310:
1= 1,49V
2=1.74V

L7630:
1=0.9V
2=1V

Can you help?

 

[Paul Daniels]

What's PPVRTC_G3H ?
Do you also get PCH_CLK32K_RTCX1 (32kHz) ?

Look around U6100 / U1900 for damage/corrosion

Also check U8005 for corrosion

 

[hgoncalves]

Hi Paul,
Here is the colour blind guy from your FlexBoard. Tks for the help...
PPVRTC_G3H = 3.3V
U6100 / U1900 seams to be ok but I found around Y1905 it has corrosion and signs of liquid contact. I'll replace those resistors, caps and also Y1905
U8005 seams to also be ok

 

[Paul Daniels]

Ah, small world there. Hope the new releases of FlexBV are helping you adjust colours more to your liking, especially now with the colour adjustable parts ability.

Did you get 32kHz on pin 12 of U1900 ?

Is the corrosion seemingly from liquid ingress or more just that typical surface corrosion that happens over time just naturally ?

 

[2informaticos]

Do you get PLT_RESET_L?

 

[hgoncalves]

I get an average 30khz and 40 max, on PCH_CLK32K_RTCX1 (U1900).
The corrosion seams to be from liquid contact (shal i remove those components right now)?

2informaticos
I do have 3.3V on PLT_RESET_L

 

[2informaticos]

RTC block is OK, if machine turns on.

Did you try known good BIOS?

 

[hgoncalves]

No, I haven't tried a known good BIOS yet. Shall I do it now) , or test something else first?

 

[hgoncalves]

I just notice that all test points near Y1905, includind PCH_HSIO_PWR_EN test point, are missing.
Can it be it? Where is the best choice to jumper it?

 

[hgoncalves]

Hi,
I rebuild the tracks of the test points near Y1905 to the U1900 and it started to work.
Tks.