Dell Latitude E7470 no start

[Technodoc]

Hell guys, I need some help with this Dell E7470 laptop.
The complaint is "does not wurk".

Mainboard AAZ60 LA-C461P

Does not boot
capslock led always on
No fan movement

When pushing the power button, the led in the powerbutton goes on, stays on for 17 seconds then goes off again. Is repeatable.

ALL ALW voltages are present.

Made some nice paint artwork about voltages and resistance, added to this post. Also the schematic.

[MOD EDIT] Link to schematic --> https://www.badcaps.net/forum/troubl...-dell-la-c461p


TIA, Frans

[mon2]

Check the voltage to ground on coil PL4. This is the filter coil for the PSID signal. If the PSID signal line is broken, the logic board cannot gauge the power of the adapter so powers down.

What is the voltage?

[Technodoc]

Hello,

Voltage to ground on PL4 = 3.4 volt.

Greetings Frans

[mon2]

Have you tested with a known good bios?

[Technodoc]

Hello,

No, not tested with a known good bios. You think that is the problem ?

[mcplslg123]

Bios issue very very unlikely as you dont even have ram voltage.