820-2838 greenlight, but no fanspin

[dukefawks]

Voltage on the RTC crystal? You are shorting the power pads to try and turn it on? Does the light turn orange when battery connected?

 

[acehobojoe]

1. The voltage on y2810 is 1.7 on the top and 1.5 on the bottom
2. I do short the pads to turn it on, but I get the same voltages regardless.
3. The light turns green, but does not turn orange with battery connected.

 

[dukefawks]

3V3_S5 even present? PPBUS voltage?

 

[acehobojoe]

3v3 S5 is not present. PPbus 3v42g3h is present. so it's like it's getting to U7840 and not coming out. P3v3S5_EN is present but P3v3S5_EN_L is not showing DC voltage.

 

[2informaticos]

"P3v3S5_EN is present but P3v3S5_EN_L is not showing DC voltage."
"Pay atention to the circle from pin4; that means inverted output (as _L specifies low level)!"
Unfortunatelly you don't pay such atention; P3v3S5_EN_L is correct...

"3v3 S5 is not present."
"21 3.5v"
So 3V3_S5 is enabled.
Change U7201 if you don't find any short around.

 

[acehobojoe]

Ok, I think it makes sense now. Inverted means it's basically 0 and that makes it in an ON state. I'll double check 7201. it seems to be working, but it could be a sensitive chip if the outputs were shorted momentarily.

 

[JohnB8812]

What is your voltage on PPBUS_G3H?

 

[acehobojoe]

8.6 is the voltage of G3H la la la

 

[larossmann]

Is PP3V3_S5 present or not?

 

[acehobojoe]

PP3v3_S5 is not present.

 

[2informaticos]

""3v3 S5 is not present."
"21 3.5v"
So 3V3_S5 is enabled.
Change U7201 if you don't find any short around."

 

[acehobojoe]

Thanks for the help. I’ll make an order for that chip as soon as I can figure out if I need some others for another board