ADATA SSD SU760

[Jay Arum]

Hello,
I am new to this forum, I have an SSD SU760 that stopped working, DC-DC converters components are heating up & also SSD controller is heating up. I need to identify some components on the board, they are all related to DC-DC converters. I have attached the files with the IC / components circled in red line.

In fig1

1. An SMD component of two SMT solder points with gold marking Data sheet URL / Drawing with pin name + definition.

2. An IC U3 with leads on 4 sides, 16 pins total, with marking Data sheet URL / Drawing with pin name + definition.
3123B
921J2

3. An IC U5, U1, U2 with 5 leads with marking Data sheet URL / Drawing with pin name + definition.
3102
925J2

4. SSD controller Realtek, RTS5733 DMQ Data sheet URL / power pin location.

5. An SOIC U14 of 8 leads with marking Data sheet URL / Drawing with pin name + definition.
2H919
DG408J

Attachments

Photo of the PCB

Photo of the PCB

[fzabkar]

The general rule is to measure the voltages at the inductors. That's where you will find the outputs of the DC-DC converters.

MT3102, M3Tek, 1.5A Continuous 2A Peak 5V Input 2.5MHz Synchronous Step-Down Converter, marking 3102, DFN_6L:
https://web.archive.org/web/20161029112954/http://m3tekic.com/upload/2016/08/20160826154353.pdf

MT3123 / MT3123A / MT3123B, M3Tek, 5V 4A 1.25MHz 15æA Low Iq FAST-PWM Synchronous Step-Down Converter, marking 3123 / 3123A / 3123B, QFN3x3_16L:
https://web.archive.org/web/20190809212449/http://www.lctek.net/uploadfile/cfile/upload/2016852311282.pdf

W25X20CLUXIG, Winbond, 2.5/3/3.3V 2M-BIT SERIAL FLASH MEMORY WITH 4KB SECTORS AND DUAL I/O SPI, marking 2Hxxx & 0Gxxxx, USON 2x3-8:
https://www.mouser.com/datasheet/2/949/w25x20cl_revf_20150806-1489633.pdf

The "SMD component of two SMT solder points with gold marking" appears to be a fuse or polyfuse or polyswitch.

My datasheet database:

https://web.archive.org/web/20230522152029/http://www.users.on.net/~fzabkar/Datasheets/DATAURLS.HTM
https://web.archive.org/web/20230522152022/users.on.net/~fzabkar/Datasheets/datasheets.txt

[Jay Arum]

Hello,
Thanks for the quick reply,

This component "SMD component of two SMT solder points with gold marking" is heating up, also the voltage drop on this part is ~0.5V to 0.6V, this drop is a lot is it not?

For testing, I can jumper this component is it not? since you said, this is a fuse. Is it possible to know the mfg + part # of this comp?

This drive slowly deteriorated from functioning intermittently to fully dead; because of the heat!
I thought DC-DC components are robust; they don’t go bust like this?


Regards.

[Jay Arum]

Hello,
Why there are two different step down DC-DC converters? I don't see any fast changing / unstable input?

MT3102 5 leads U5, U1, U2.


MT3123 16 leads U3

Regards

[fzabkar]

What are the output voltages of each converter?

[Jay Arum]

MT3102
U5 Output @ pin 3 / @L6: 1.83V / 1.79V
U1 Output @ pin 3 / @L1: 1.11V / 1.21V
U2 Output @ pin 3 / @L3: 3.33V / 3.52V

MT3123
U3 Output @ pin 16 / @L4: 3.33V / 3.33V

There is a drop of 0.5V to 0.6V between two leads of Fuse?

[fzabkar]

Those voltages look OK. The only concern I would have regarding the voltage drop across the polyfuse is if the voltage is low enough to trigger a power-on reset. You could bypass the polyfuse with a wire link or glass fuse for testing purposes.

The MT3123 converter might be providing Vcc for the NANDs. That could explain why it is heftier.