Dell Precision M6800 (LA-9782P) - identyfikacja elementu.

Witam.
Uszkodzone są niby diody przy złączu baterii.
Chodzi o PD2 i PD3.
PD2 robi zwarcie do masy w linii PBAT_SMBCLK.
Myślałem, że tylko ta dioda jest do wymiany, ale w poszukiwaniu tych diod, żeby sprawdzić co to dokładnie jest wylutowałem też PD3 i...... na teście diody, ani jeden pin w jedną i drugą stronę nie przewodzi, ani nie ma zwarcia.
Czy to są na pewno diody?
Oznaczenie na nich to CG5.

Pozdrawiam.

Hello!

It's a 5V ESD protection diodes TVNST52302AB0.
Datasheet at the attachment.

To normalne, że taka dioda nie przewodzi w ani jednym kierunku na wszystkich pinach?

This is an ESD (suppressor) protection diode and does not behave like a classic diode. This diode works similar to a zener diode - it starts to conduct when the voltage on is exceeds about 6V in any polarity.
Bidirectional ESD diode V-I characteristics:

In this case the VBR voltage is 6V and IT current is 1mA.

If you want to test this diode, you can connect it according to the following schematic:

There are actually two independent ESD diodes in the single package - let's say them A and B, so you have to test both of them separately.
Let's test the diode A first:
Build the circuit according to the schematic and supply the circuit with the laboratory power supply. Measure the voltage in reference to the point "A" with a multimeter. Then reverse the polarity of the laboratory power supply and measure the voltage again. If you measured the voltage of about 6V at both polarities of the laboratory power supply, the diode "A" is fine.
As for the test of diode "B", just switch the ground and multimeter connection to the point B and do the same tests again. If you measured the voltage of about 6V at both polarities of the laboratory power supply, the diode "B" is fine as well.

Thanks for this tip.
Dioda wymieniona, laptop zaczął widzieć i ładować baterię.