Thinkpad e15 FE4A0/FE5A0/ dead

[Maurizio Merli]

Hi at all. My thinkpad is dead yesterday.
After open the bottom board, i see PQ1101 go to burn after powerup.
Probably is shorted? On the schematic is a n channel mosfet, marked as AONR32340C.



Hope someone help.

Thanks,

Maurizio

[SMDFlea]

PE606BA - https://www.badcaps.net/forum/troubl...86#post1672286

[Maurizio Merli]

Thanks SMD. I replace it with this.

Thanks again.

Maurizio

[Maurizio Merli]

SMDFlea can i buy safely on aliexpress?

Thanks so much,

Maurizio

[mcplslg123]

Replace both PQ1101/1102 along with pwm controller associated with these mosfets at one go.Else the new mosfet may get shorted again
.After removing the controller ic plus both high/low side fets,measure resistance to GND on the coil to be sure its not shorted.

[Maurizio Merli]

Thanks mcpl.

The mosfet driver, is marked CG9. What did mean?
I'm unable to find the datasheet.

Thanks,

Maurizio

[mon2]

See attached.

Your board is NM-C421.

Datasheet for this controller:

ONSEMI # NCP81253MNTBG

[ATTACH]n3534892[/ATTACH]

[Maurizio Merli]

Thanks so much mon2.

Maurizio

[Maurizio Merli]

Hi at all, i replaced all the mosfet and the driver, but before power-up i note, have missed (sadly with hot air) this little capacitor marked in orange.
What type of value have this capacitor? Before power up i wanna to install it.



Thanks,

Maurizio.

[mon2]

Sorry, which capacitor?

The part in the square is PQ1101 = mosfet.

Is that part missing?

[Maurizio Merli]

Mon2, is the little cap immidiately on the left of PQ1101 and circle in orange. No the Mosfet is not missing.

[Maurizio Merli]

Sadly i don't find the pcb layout, it's on the net but i can't find.

Thanks,

Maurizio.

[mon2]

Probably mates with the nearby MOSFET. Use the meter in resistance mode to confirm which pins and share the details.

[Maurizio Merli]

Thanks mon2 i trace it with the schematic.

[Maurizio Merli]

Any continuity with the DC/DC converter with the mosfet.
I give up, without the component layout i'm lost.

Sorry again

Maurizio.

[Maurizio Merli]

Ok i find the component i lost, it's not a capacitor, is PT0008 (prf15bb541nb6rc) a NTC thermistor, 640 ohm made by murata.


I hope to find it a replacement.

[Maurizio Merli]

I find this murata ptc are 540 ohm not 640. But is impossible to find an equivalent.
How substitute this?

Thanks so much again,

Maurizio.