MacBook Pro USB slots unrecognizable

[caspian]

Re: MacBook Pro USB slots unrecognizable

working USB voltages will help if a USB mouse is connected to it.
the most probable suspects are L4600, D4600, L4610, D4610, U4650. It would be good if you test them.

[Johndill]

Re: MacBook Pro USB slots unrecognizable

working USB voltages will help if a USB mouse is connected to it.
the most probable suspects are L4600, D4600, L4610, D4610, U4650. It would be good if you test them.

Here are the good voltages from the board with working USB ports:

With USB mouse connected:
4. 0.0mV
3. 7.1mV without mouse moving
2. 3.075V
1. 5.04V

4. 0.0mV
3. 13.1mV without mouse moving
2. 3.060V
1. 5.04V

Without USB mouse connected:
4. 0.0mV
3. 0.3mV
2. 0.3mV
1. 5.04V

4. 0.0mV
3. 0.3mV
2. 0.3mV
1. 5.04V

[Johndill]

Re: MacBook Pro USB slots unrecognizable

Here are the bad voltages from the board I am fixing:

With USB mouse connected:
4. 0.0mV
3. 1.0mV
2. 4.88V
1. 5.00V (This voltage drops to 4.95V with USB hard drive connected)

4. 0.0mV
3. 2.9mV
2. 3.184V
1. 5.00V (This voltage drops to 4.95V with USB hard drive connected)

Without USB mouse connected:
4. 0.0mV
3. 0.9mV
2. 40.0mV was around here and kept slowy rising
1. 5.00V

4. 0.1mV
3. 70.0mV was around here and kept slowy rising but kept going up and down about 0.5mV and still rising
2. 1.1mV
1. 5.00V

[caspian]

Re: MacBook Pro USB slots unrecognizable

these voltages are different from the healthy board's. but they do not say what is wrong. Now test L4600, D4600, L4610, D4610. It will be great if you find a faulty one.

[DjBigman]

Re: MacBook Pro USB slots unrecognizable

Hi!

I think you should check the channel of Loius Rossman. He made many usb port fixies on macbooks. M

[Johndill]

Re: MacBook Pro USB slots unrecognizable

these voltages are different from the healthy board's. but they do not say what is wrong. Now test L4600, D4600, L4610, D4610. It will be great if you find a faulty one.

L4600
1. 1.1mV
2. 1.1mV
3. 62.0mV
4. 1.0mV

L4610
1. 1.0mV
2. 90.5mV
3. 1.2mV
4. 1.2mV

D4600
1. 0.0mV
2. 0.5mV
3. 0.1mV
4. 0.6mV
5. 66.0mV
6. 2.5mV

D4610
1. 0.0mV
2. 2.6mV
3. 1.4mV
4. 91.8mV
5. 0.7mV
6. 1.3mV

[Johndill]

Re: MacBook Pro USB slots unrecognizable

Hi!

I think you should check the channel of Loius Rossman. He made many usb port fixies on macbooks. M

Thanks, I found his USB repair video that was done on the same model as mine and it helped me understand the USB circuit a bit better

[Johndill]

Re: MacBook Pro USB slots unrecognizable

L4600
1. 1.1mV
2. 1.1mV
3. 62.0mV
4. 1.0mV

L4610
1. 1.0mV
2. 90.5mV
3. 1.2mV
4. 1.2mV

D4600
1. 0.0mV
2. 0.5mV
3. 0.1mV
4. 0.6mV
5. 66.0mV
6. 2.5mV

D4610
1. 0.0mV
2. 2.6mV
3. 1.4mV
4. 91.8mV
5. 0.7mV
6. 1.3mV

The filters L4600 and L4610 don't look right. The same voltage should pass through all pins. The working board has 0.3mV on all pins of L4600 and L4610.

[caspian]

Re: MacBook Pro USB slots unrecognizable

measure voltages on L4600 and L4610 while a usb mouse is connected. In the youtube channel of Loius Rossman, there is a video on how to properly test inductors like L4600 and L4610 and what kinds of problem they might have. you should watch it. Because I am not a Macbook specialist, I cannot help much in Macbook repair.

[Johndill]

Re: MacBook Pro USB slots unrecognizable

measure voltages on L4600 and L4610 while a usb mouse is connected. In the youtube channel of Loius Rossman, there is a video on how to properly test inductors like L4600 and L4610 and what kinds of problem they might have. you should watch it. Because I am not a Macbook specialist, I cannot help much in Macbook repair.

His opinion was replace it as a multimeter can't test filters properly, so I'll test again with a USB mouse connected and see what I get.

[Johndill]

Re: MacBook Pro USB slots unrecognizable

measure voltages on L4600 and L4610 while a usb mouse is connected.

One port randomly started working when I was measuring the voltage of its filter which I think was L4610 pin 4 was 3.0V and 4.88V on pin 3 so replacing both filters (L4600 and L4610) seems like the next step.

[Johndill]

Re: MacBook Pro USB slots unrecognizable

Success!! My YIHUA 858D arrived yesterday and I've replaced L4600 and L4610 from a dead donor board successfully

Both USB ports are now working, thank you Caspian for the tech help once again and DjBigman for referring me to Loius Rossman as his videos were a big help

Don't know why the third picture is uploading upside down.

[kaister]

Re: MacBook Pro USB slots unrecognizable

Hi, I don't have a donor board to replace L4600. Does anyone know what kind of part this is and where can I purchase this part?

[mon2]

Re: MacBook Pro USB slots unrecognizable

L4600 is an EMI filter that is common to use to filter out noise on USB D+/D- lines.

We use them in our product designs all the time. The footprints do vary.

They are technically not required so you can, for now, remove this 4 pad SMD part and bridge then as straight through. Often you can apply a solder blob in series to allow for the D+ to bridge to the downstream D+ and then D- to D-.

Be sure to NOT short D+ to D-.

Then you can test again to see if the USB port is working.

The part listed in the schematic is from Murata but is very common to source from other vendors.

Murata DLP11S EMI filter:

DLP11SA900HL2L (believe this one should work fine)

https://www.arrow.com/en/products/dl...-manufacturing

hope this helps.

[damfunk]

Re: MacBook Pro USB slots unrecognizable

L4600 is an EMI filter that is common to use to filter out noise on USB D+/D- lines.

We use them in our product designs all the time. The footprints do vary.

They are technically not required so you can, for now, remove this 4 pad SMD part and bridge then as straight through. Often you can apply a solder blob in series to allow for the D+ to bridge to the downstream D+ and then D- to D-.

Be sure to NOT short D+ to D-.

Then you can test again to see if the USB port is working.

The part listed in the schematic is from Murata but is very common to source from other vendors.

Murata DLP11S EMI filter:

DLP11SA900HL2L (believe this one should work fine)

https://www.arrow.com/en/products/dl...-manufacturing

hope this helps.

Many thanks for this tip, it helped to identify that the both L4600 and L4610 are broken.

[mon2]

Re: MacBook Pro USB slots unrecognizable

@damfunk, excellent!! Very glad to hear that it helped.