Compal LA-6901P : No power with battery alone

[dimah77]

Hi;
Having packard Bell with Compal LA-6901P With no power with battery.
- BATERRY CHARGING OK
- POWER ON WITH CHARGER ALONE : OK
- POWER ON WITH BOTH CHARGER AND BATTERY : OK
- POWER ON WITH BATTERY WITHOUT CHARGER : NO OK

WITH CHARGER , ALL VOLTAGE ON PWR JUMPER ARE OK
WITH BATTERY ONLY : 10v on ON/OFFBTN !!!!!

[homeless_cz]

Re: Compal LA-6901P : No power with battery alone

WITH BATTERY ONLY : 10v on ON/OFFBTN !!!!!

??? You should have 3,3V on that button.

Anyway here is schematic -> https://cdn.badcaps-static.com/pdfs/...a12dee6b89.pdf

Focus on page 48 and check mosfet PQ5 and other parts related to its Gate.

[dimah77]

Re: Compal LA-6901P : No power with battery alone

??? You should have 3,3V on that button.

Anyway here is schematic -> https://cdn.badcaps-static.com/pdfs/...a12dee6b89.pdf

Focus on page 48 and check mosfet PQ5 and other parts related to its Gate.

what voltages should i get on PQ9 pins with battery only ?

[homeless_cz]

Re: Compal LA-6901P : No power with battery alone

Both cases battery and adapter pin 3 is clear, GND, pins 1 and 2 almost 0. In battery mode PQ9 gets short pulse to base and it sets gate of PQ5 to GND via PR15 , this opens PQ5 to pass the battery voltage to system. When you plug adapter, then VIN = 19V which closes PQ5 via PR16.

[dimah77]

Re: Compal LA-6901P : No power with battery alone

Both cases battery and adapter pin 3 is clear, GND, pins 1 and 2 almost 0. In battery mode PQ9 gets short pulse to base and it sets gate of PQ5 to GND via PR15 , this opens PQ5 to pass the battery voltage to system. When you plug adapter, then VIN = 19V which closes PQ5 via PR16.

Thanx a lot,
problem solved by changing PQ5