FUJITSU LIFEBOOK E780 MARTWY

Witam,
Mam laptopa:

Po podłączeniu zasilacza pobór 0,026 A. Świeci się jedynie zielona dioda.
po podłączeniu baterii pod płytę - bateria jest ładowana.
Na każdej cewce 0 V
Rezystancje na cewkach poniżej:


Prośba o dalsze sugestie. Nie posiadam schematu.

Hello!

How about the resistances on two black coils near the RAM memory connector?
Also measure the voltage to ground on this two coils.

matic napisał(a):How about the resistances on two black coils near the RAM memory connector?

For the both coils is "OL" (out of scale)

matic napisał(a):Also measure the voltage to ground on this two coils.

The results are below.

Measure the voltages to ground on pins 1, 5, 7, 13, 19, 20, 21, 28 of QFN chip (marking 62386) near this coils.

matic napisał(a):Measure the voltages to ground on pins 1, 5, 7, 13, 19, 20, 21, 28 of QFN chip (marking 62386) near this coils.

1 - 0V
5 - 5V
7 - 5V
13 - 3,3V
19 - 3,3V
20 - 19V
21 - 5V
28 - 0V

Check, if the voltage is present on the power button.

matic napisał(a):Check, if the voltage is present on the power button.

1 - 0V
2 - 0V
3 - 3,3V
4 - 3,3V
5 - 0V
6 - 0V
7 - 3,3V
8 - 1,5 V
9 - 0,2V

Check, if the voltage on any pin (3, 4 or 7) drops to 0V, when the power button is pressed.

matic napisał(a):Check, if the voltage on any pin (3, 4 or 7) drops to 0V, when the power button is pressed.

The voltage don't drop.

Measure the voltages on the power button itself.

The button has 3,3V

After press drop to 0V

Check, if that voltage drops to 0V, when the power button is pressed.

matic napisał(a):Check, if that voltage drops to 0V, when the power button is pressed.

Yes, drop to 0V.

If the voltage on none of the pins 3, 4 or 7 of button board connector on the motherboard does not drop to 0V, when the power button is pressed it is only one option - damaged FFC cable between the motherboard and power button board, or damaged FFC connector on the motherboard.

Use a continuity tester and check the connections.

I checked it and the cable was broken.
I bought new one. Now when I press power button the voltage drop to 0 V in motherboard but the motherboard still doesn't start.
After press, power consumption has increased for one moment from 0,026 to 0,036

Did you perform an RTC reset?
Check, if the RTC battery is good (voltage on it should be 3V).

Measure the voltages to ground on all pins of highlighted two quartz with connected RTC battery only (without power supply connected).

matic napisał(a):Did you perform an RTC reset?

Yest I did.

matic napisał(a):Check, if the RTC battery is good (voltage on it should be 3V).

The battery have 3V.

matic napisał(a):Measure the voltages to ground on all pins of highlighted two quartz with connected RTC battery only (without power supply connected).

For the all pins in these two quartz = 0V.

Bezel018 napisał(a):For the all pins in these two quartz = 0V.

Measure it again with connected power supply to the board.
If there is still 0V on all pins, check if there are any more quartz on the board in the same housing as these two.

matic napisał(a):Measure it again with connected power supply to the board.

The results below:

matic napisał(a):If there is still 0V on all pins, check if there are any more quartz on the board in the same housing as these two.

The motherboard doesn't have more of them.

This voltages seems ok, but it is strange that there is 0V with connected RTC battery only.

Please, post a clear picture of RTC battery connector area of the board with nearby surroundings.