Crucial CT500MX200SSD1 - help identifying NL component

[melvin]

Hello,
Does anyone know what is that? It has NL on it, nothing more.

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[HaQue]

Hi, a pic of whole board can help to deduce what component could be in that part of circuit.

SMDs are marked with a marking code, so you would google for something like:
SMD Marking code "NL"

results like:

http://www.s-manuals.com/smd/nl
http://www.josvandijken.nl/smd_codes.php

Once you have a candidate you would verify by looking at the circuit/schematics of other available units and see if it makes sense.

[fzabkar]

As HaQue has said, context would have been helpful, but I suspect that the part is a 3.3V LDO regulator. I believe it provides a 3.3V supply for the adjacent MSP430 power sequencer/controller. ISTR that the series resistors for Vin and Vout are 10 ohms. If the output is low, then I would be testing the MSP430 for shorts.

[melvin]

Pictures attached. It was in the circled area. This little thing gets really hot in seconds. Black stains are from parker not burned.

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[fzabkar]

Measure the resistances between ground and the 2.8V/3.3V test points.

Check that the 10 ohm resistors are not open or stressed.

I suspect that the MSP430 IC will be shorted to ground.

BTW, I'm guessing that the regulator was probably OK.

TLV70028DSER/T, Texas Instruments, 200mA, 2.8V, Low-IQ, LDO Regulator, marking NL, WSON-6:
http://www.ti.com/lit/ds/symlink/tlv700.pdf

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[melvin]

Resistors are not open. Regulator is soldered.

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[fzabkar]

@melvin, if you measure the resistance between ground and the "0.8V" test point, you will find that it is approximately 4 ohms. This means that the MSP430 microcontroller is shorted.

[fzabkar]

The following thread has a similar problem:

http://forum.hddguru.com/viewtopic.php?f=10&t=33908

[melvin]

Thank you fzabkar,
Yes, resistance is 4,5 ohms. Also the mentioned regulator is cold now, and test points show 0 or 0,8V so more work to be done here.