Dell Inspiron 3585 CAL51 LA-F121P

[mon2]

Re: Dell Inspiron 15 5570 Plugged in not charging

PR5: 2.168Ω

Not mistyped It is indeed a 2K resistor

So this should be written as 2.168K = ~2.2k or ~2K2 ohms.

From the measurements on PD1, it may be ok since the voltage is ~3v. This ~3v is from the pull-up after PQ1 to park this line to ~3v.

Common failures on the PS_ID line are @ PD1 and PQ1. More after picking up junior...

[Eniaro]

Re: Dell Inspiron 15 5570 Plugged in not charging

PD1 is a dual line unidirectional TVS diode for 5 volts.

The part will be passive and remain out of circuit unless a transient event spikes the voltage higher than 5 volts. Then it will shunt the event to ground to protect the line from damage.

Datasheet is attached. It is a common part that can be replaced by many other vendors.

From where do you purchase your parts?

Is there a Mouser or Digikey part that is similar? I can't seem to find it

[mon2]

Re: Dell Inspiron 3585 CAL51 LA-F121P

This one should do the trick.

5 volt working voltage.

SOT-523 package.

https://www.digikey.ca/en/products/d...2B3T-7/2918773

and another one here:

https://www.digikey.ca/en/products/d...02BXTG/5032246

[Eniaro]

Re: Dell Inspiron 3585 CAL51 LA-F121P

I ordered the little fuse and it's larger than what's installed. I decided to harvest one from Compal AAL15 LA-D071P : PD3

With that done and replacing PQ1 it seems to be charging except... The PC no longer powers on. The light code is 2 Amber 1 White = CPU Failure

Maybe it has something to do with the RC639 resistor? I'm going to remove it and see what happens

[Eniaro]

Re: Dell Inspiron 3585 CAL51 LA-F121P

New RC639 Resistor no RC639 resistor... no change 2 Amber 1 White

Went from a pc that doesn't charge and runs slow, to won't power on... I'm lost

[dana.repouille]

Re: Dell Inspiron 5570 CAL60 LA-F114P

@Mon2
I have taken resistance and voltage readings from a fully functional CAL60 LA-F114P motherboard (Inspiron 5570/5770). Could you please review my findings below, and in the three attachments I have uploaded? I would appreciate your feedback.

On the edge of the CAL60 LA-F114P motherboard (under DC_IN)
between PQ1 and PD2 (absent) there are five resistors:
PR5, 2.2K-ohm (nearest the edge of the board)
PR1, 33-ohm
PR3, 100K-ohm
PR6, 15K-ohm
PR4, 10K-ohm (between PQ2 and the missing PD3)

Measurements for each component of the PS_ID circuit:

PL3 BLM15AG102SN1D_2P, 0.5-ohm
1 to Power jack, ~3.3V
2 to PD1/PR3/PQ1-1-Drain, ~3.3V

PD1 TVNST52302AB0_SOT523-3, 0.8V voltage drop in diode mode
1 to GND
2 to PL3/PR3/PQ1-1-Drain, ~3.3V
3 N/C

PR3 100K_0402_1%
1 to PL3/PD1/PQ1-1-Drain, ~3.3V
2 to PR6/PQ2-2-Base, ~0.4V
(voltage divider for PQ2-2-Base)
PR6 15K_0402_1%
1 to PR3/PQ2-2-Base, ~0.4V
2 to GND

PQ1 FDV301N-G_SOT23-3
1-Drain to PL3/PD1/PR3 (~3.3V)
2-Gate to PQ2-1-C/PR4 (~5V)
3-Source to PR1 (~3.3V)

PQ2 MMST3904-7-F_SOT323-3
1-Collector to PQ1-2-Gate/PR4 (~5V)
2-Base to PR3/PR6, ~0.4V
3-Emitter to GND

PR4 10K_0402_1%
1 to +5VALW (5V pull-up)
2 to PQ1-2-Gate/PQ2-1-Collector

PR1 33_0402_5%
1 to PQ1-3-Source (~3.3V)
2 to PR5/MEC1416 pin 36 (~3.3V)

PR5 2.2K_0402_5%
1 to PR1/MEC1416 pin 36 (~3.3V)
2 to +3VALW (3.3V pull-up)