Fujitsu E746 - Brak schemat, gniazdo zasilania

Measure the power consumption (in mA) of the board in the following cases without battery connected:
a) Board turned off (before pressing to the power button).
b) Board turned on with RAM memory connected.
c) Board turned on without RAM memory connected.

Since the board doesn't work with your service power supply, you need to cut the Red or Black wire (one of them) between the DC socket and the motherboard and connect an ammeter between both ends of cut wire to measure the power consumption.

An alternative option is to use a "clamp" meter. This way you can measure the current without cutting the wire.
In this case you can measure the current at points "b" and "c" only, since such a meters usually can not measure low electrical currents.

Measure the voltages to ground on both pins of diode "A" and on pins 1, 3 of diode "B" with the RTC battery connected only (without power supply and main battery).

Diode "B" pinout:

Use a DDR4 RAM slot LED tester and test both RAM slots.


Measure the voltages to ground on both pins of marked quartz with the RTC battery connected only (without power supply and main battery). It's best to measure these voltages with an oscilloscope, if you don't have it, measure with a multimeter.

Golima napisał(a):Mam pytanie, czy te pomiary dokonywać na włączonej płycie, czy wyłączonej?

matic napisał(a):with the RTC battery connected only (without power supply and main battery).

Isn't it obvious? How can you turn on a laptop without the main battery and power supply connected?

Golima napisał(a):[ Obrazek ]
[ Obrazek ]

Am I right that only a few LEDs light up on the RAM tester? All other ones don't glow any a little, even in the dark?

Test the RAM slots with the power supply and main battery disconnected from the motherboard. What LED pattern do you get on the RAM tester in this case?