Razer mouse component.

[diif]

I have some faulty Razer Naga mice I am working on.
They have different faults from not being detected by the PC to unknown device to everything working apart from movement.
I am trying to identify the first component the 5v connects to.
I'm hoping you can help.
It's 6 pins, the middle on one side has the 5v in and on the other side the two outer legs show 3v, no other voltages to speak of.
On a mouse that is not detected by the PC, I only get the 5v with nothing coming out.

Apologies for the bad photo, but tricky using a £2 magnifier and the camera on my phone.

It's marked ZE then has a 47 on it's side then a t.

Thank you.

[stj]

Re: Razer mouse component.

3v voltage regulator

[diif]

Re: Razer mouse component.

Cheers stj, any idea on the package ? it measures about 1.5mm x 3mm

[fzabkar]

Re: Razer mouse component.

What is the full model/part number of the mouse?

The markings suggest a NXP/Philips format, but I can't find an LDO regulator that matches the pinout. All I get is a dual transistor (PNP + NPN), but that doesn't seem to fit. I do agree that the part is most likely a 3.0V regulator. Which of the other pins are grounded?

[stj]

Re: Razer mouse component.

the package is just a SOT23-6
nothing special.


it may be a dual output regulator from ricoh

[redwire]

Re: Razer mouse component.

Check any electrolytic capacitors, I've replaced many on Razer mice and it fixes the weird problems.

[diif]

Re: Razer mouse component.

Thanks guys, it's a Razer Naga 2014.
The two pins with 3v on show continuity as do the pins on the other side at 0v.
The Ground pin is opposite the 5v one.

[fzabkar]

Re: Razer mouse component.

If the 3V pins are connected, then I would think that the part cannot be a dual regulator.

It's interesting that the markings of both L3 and L1 have been removed in the full photo. It's also interesting that both parts are identified as Lx rather than Ux. The former is normally used for inductors but perhaps in this case it refers to LDO regulators. Can you identify the marking on L1? Is L1 an IC or an inductor?

The microcontroller (LPC11U23F) is a 3.3V device (1.8V - 3.6V). If there is continuity between the 3V pins of L3 and the Vdd pins of the microcontroller, then this would confirm the function of L3.

[diif]

Re: Razer mouse component.

Thank you fzabkar, I think it's just the poor lighting and photo that removed the marking from L3 in the big photo although L1 has no markings.
L1 looks to be an inductor, as I see little copper coils underneath the top.

I've tested the continuity between the 3v pins on L3 and the Vdd and the microcontroller and there isn't any.

[fzabkar]

Re: Razer mouse component.

OK. I thought that maybe the markings on one mouse were erased, the other not.

Could U3 be the 3.3V LDO regulator for the micro? Could L3 connect to the optics?

I suspect that U1 may be a PSU supervisor which connects to the micro's reset pin. Its other pins would then be Vdd and Ground.

[diif]

Re: Razer mouse component.

U3 is marked 3A2, two 5v inputs and a ground on one side with 3.3v on the other and a pin that's doesn't seem connected to anything. So yes that looks like a 3.3v LDO regulator something like a LP2980-N ?

U1 has 3.3v on two pins and also a ground.

L3 connects to the USB, ground and 5v in the middle and two sets of pins connecting to the Data+ and Data-

[fzabkar]

Re: Razer mouse component.

I suspect that U1 might be something like this:

https://cdn.badcaps-static.com/pdfs/...4d9dac494c.pdf
https://cdn.badcaps-static.com/pdfs/...125ed7ee2a.pdf

FWIW, a marking code of M73 for the above part denotes a 3.06V threshold.

I wonder if L3 consists of the typical common mode inductor for the USB data lines plus additional components, eg ESD protection diodes? That said, what would be the function of L1?

[fzabkar]

Re: Razer mouse component.

Could L3 look like this?

          +5V
          ===
           |
          .-+-.
          |  |
     common  -  - ESD
      mode  ^  ^ diodes
     inductor |  |
      ___   |  |
Data+ o---UUU-----)---+--o Data+ (device)
(host)   ===   |  |
      ___   |  |
Data- o---UUU-----+---)--o Data- (device)
(host)       |  |
          |  |
          -  - ESD
          ^  ^ diodes
          |  |
          '-+-'
           |
          ===
          GND

[diif]

Re: Razer mouse component.

Thanks, L3 does look like that but the inductor is on the device side not the host side with a resistor and a cap then the inductor then connecting to USB_DM and USB_DP.

That looks about right for L1 although the pin arrangement is different.

[fzabkar]

Re: Razer mouse component.

Other than checking for a break in the USB cable, ISTM that all you can do is to verify the 3.3V supply, MCU reset state, and 12MHz clock. If these are OK and the mouse is not detected, then I would suspect the micro.

If the mouse identifies via USB but doesn't move the cursor, then I would suspect the optical sensor, especially if there is no illumination of the surface.

[diif]

Re: Razer mouse component.

Cheers for your input fzabkar, I have come to a similar conclusion although there is one mouse where the data+ and ground are shorted on L3. I'm waiting for a small hot air nozzle to arrive then I shall start swapping some components and hopefully get some out of these 6 mice fully working.

[fzabkar]

Re: Razer mouse component.

there is one mouse where the data+ and ground are shorted on L3.

Try isolating/snipping the ground pin of L3. This should allow the Data+ line to float, but you will be without ESD protection on the ground side.

[fzabkar]

Re: Razer mouse component.

XC6221A332, Torex, LDO regulator, 200mA, marking 3A2 = 3.3V:

[diif]

Re: Razer mouse component.

Thanks again.

[Argirisarchi]

Re: Razer mouse component.

Hello,
did the mouse worked with this component?
Thank you!
I hope you are still member on BadCaps...