Wii U Repair, No Power

[gudenau]

I have a Wii U that does not power on. I checked the voltage on the board right where it connects to the power adapter and it gets ~14v. I also had someone check a working one for a power rail by the CPU that was 0v on my board, she had 1.5v. This was right after what looks like inductors to me right overthe giant package.

I am not too sure whereto look, I've checked a few resisters and caps for shorts and open circuits and the all look fine.




Sadly I only have a crappy multimeter that I can't trust a quarter the distance I can throw it.

[strawberry]

Does enable signal comes to this powersupply? Is there any shorts on CPU.. any of these eight powersupply?
How about power button wear-out?

[gudenau]

Does enable signal comes to this powersupply? Is there any shorts on CPU.. any of these eight powersupply?
How about power button wear-out?

Sorry, didn't get notified...

Not sure of the power supply on the board, but the brick does work.

Per button isn't an issue at all, that's software more than hardware control.

Haven't found any sorts, plus that would probably blow what I think is a fuse or get hot.

[BMack]

Did you check that fuse coming off the connector? Check voltage across all those caps and diodes.

[gudenau]

Did you check that fuse coming off the connector? Check voltage across all those caps and diodes.

The fuse is in tact, anything in particular I should look for with the caps and diodes?

[EPTech]

Hi there,

Those inductors you mention are indeed part of the supplies for the central processor. I would start by measuring whether there is voltage across any capacitor on the output of the step down converters, that is, on the 'big' capacitors near the inductors. IF you do not measure any voltage there, check whether there is voltage on the inputs of the step down converters, that is, on the brown, smaller, ceramic packages near the supply. If there is voltage on the ceramic input capacitors, but not on the bulk output capacitors, that particular supply may be switched of or defective. There usually is an enable signal on the control IC's, check the data sheet.
If none of the input capacitors have voltage on them (after pressing the power switch) you may have failure on the main supply or some standby power circuit. Without a schematic I cannot tell whether the standby circuit is implemented in HW or SW in the main processor or some other peripheral processor.

Happy hunting.

[gudenau]

Hi there,

Those inductors you mention are indeed part of the supplies for the central processor. I would start by measuring whether there is voltage across any capacitor on the output of the step down converters, that is, on the 'big' capacitors near the inductors. IF you do not measure any voltage there, check whether there is voltage on the inputs of the step down converters, that is, on the brown, smaller, ceramic packages near the supply. If there is voltage on the ceramic input capacitors, but not on the bulk output capacitors, that particular supply may be switched of or defective. There usually is an enable signal on the control IC's, check the data sheet.
If none of the input capacitors have voltage on them (after pressing the power switch) you may have failure on the main supply or some standby power circuit. Without a schematic I cannot tell whether the standby circuit is implemented in HW or SW in the main processor or some other peripheral processor.

Happy hunting.

C1428 has 0v, could that be the fault?

[abraxa]

C1428 has 0v, could that be the fault?

Certainly. However, we don't know which cap is C1428 on the board. Is it an input or output filter cap of the voltage regulator circuit it's a part of? Pictures would be best, of course.

[gudenau]

C1428 has 0v, could that be the fault?

Certainly. However, we don't know which cap is C1428 on the board. Is it an input or output filter cap of the voltage regulator circuit it's a part of? Pictures would be best, of course.

The cap in red is C1428.

[Armadillo]

You can't measure it that way; C1428 and C1429 are in series. If you want, you should measure both ends of the caps.

Measure it per the diagram attached., what is the voltage?

[gudenau]

You can't measure it that way; C1428 and C1429 are in series. If you want, you should measure both ends of the caps.

Measure it per the diagram attached., what is the voltage?

~14.5v, and when I looked at the board some more the 0v cap is between two grounds. Smoothing I guess?

[Armadillo]

You can't measure it that way; C1428 and C1429 are in series. If you want, you should measure both ends of the caps.

Measure it per the diagram attached., what is the voltage?

~14.5v, and when I looked at the board some more the 0v cap is between two grounds. Smoothing I guess?

The first 2 capacitors and the line choke inductors you just measured forms a filter. Nothing wrong with that.

The typical buck converter are those in the pictures. You should be measuring the buck voltages. But You need to take one close up photo so that I can see the IC and so that I can tell you how to go about.

I hope someone with the board can help you out actually. I don't have the board.

As you have little background in troubleshooting, someone with the board and expertise can be a great help here,

Take the one with the arrow.

Or you can take your friend board and compare Pin to Pin. Put meter to voltage mode. Hook Black to Ground, and then use the Red measure pin to pin of each of the IC and compare with your friend good board.   

Edit: While you do that, careful not to short out your friend good board, so that you can return her in good piece, yeah;

[gudenau]

You can't measure it that way; C1428 and C1429 are in series. If you want, you should measure both ends of the caps.

Measure it per the diagram attached., what is the voltage?

~14.5v, and when I looked at the board some more the 0v cap is between two grounds. Smoothing I guess?

The first 2 capacitors and the line choke inductors you just measured forms a filter. Nothing wrong with that.

The typical buck converter are those in the pictures. You should be measuring the buck voltages. But You need to take one close up photo so that I can see the IC and so that I can tell you how to go about.

I hope someone with the board can help you out actually. I don't have the board.

As you have little background in troubleshooting, someone with the board and expertise can be a great help here,

I take it the strange dual triangle thing is a brand?

[Armadillo]

Those IC you mark are mosfets.
Apparently the power management IC must be somewhere else.
Anyway;
Measure the blue arrows shown;

This is typical measurement, so you measure the capacitor to identify which one has no voltage.

Also the 5066 controller as attached.

[gudenau]

Those IC you mark are mosfets.
Apparently the power management IC must be somewhere else.
Anyway;
Measure the blue arrows shown;

This is typical measurement, so you measure the capacitor to identify which one has no voltage.

They are both 0v.

Edit:
There is a chip labeled "LV5065\n2UNQ" directly on the other side.

[Armadillo]

Those IC you mark are mosfets.
Apparently the power management IC must be somewhere else.
Anyway;
Measure the blue arrows shown;

This is typical measurement, so you measure the capacitor to identify which one has no voltage.

They are both 0v.

Edit:
There is a chip labeled "LV5065\n2UNQ" directly on the other side.

All the 5065 , 5064, do similar measurement at the capacitors.

Hope you will arrive at the big one supplying all these smaller ones.

Measure Pin 1 and 8 of the mosfet, do you have a voltage there. ?
I think pin 2 and pin 4 is connected [mosfet] together, is it? can you trace this pin to a bigger IC.

[gudenau]

Those IC you mark are mosfets.
Apparently the power management IC must be somewhere else.
Anyway;
Measure the blue arrows shown;

This is typical measurement, so you measure the capacitor to identify which one has no voltage.

They are both 0v.

Edit:
There is a chip labeled "LV5065\n2UNQ" directly on the other side.

All the 5065 , 5064, do similar measurement at the capacitors.

Hope you will arrive at the big one supplying all these smaller ones.

None of the larger caps have voltage expect the one close to the power input.

[Armadillo]

There is a fuse that look at photo but mark 10A. Power off, measure the resistance across it.

Never mind you measured it just now.

[gudenau]

There is a fuse that look at photo but mark 10A. Power off, measure the resistance across it.

About 0?.

[Armadillo]

There is a fuse that look at photo but mark 10A. Power off, measure the resistance across it.

About 0?.

Yeah, I know.
Can you answer above questions completely regarding the mosfet voltage and the tracing pin to device.

[gudenau]

There is a fuse that look at photo but mark 10A. Power off, measure the resistance across it.

About 0?.

Yeah, I know.
Can you answer above questions completely regarding the mosfet voltage and the tracing pin to device.

Does this help?



Anyone on dial-up would hate this thread. :-P

[Armadillo]

do you have a logic probe? or oscilloscope?

For all the 0 volt you indicated, measure the mosfet Drain to Ground point, any voltage there? Either there is no pulse to the gate or no supply going into the Drain. Can you confirm  any?

For all the 5064, 5065 5066 controller, so can I assume all OK supplying voltage?

[gudenau]

do you have a logic probe? or oscilloscope?

I only have a crappy multi-meter I am afraid.

[Armadillo]

Hi guys, if you reading this, do chip in.

[Armadillo]

do you have a logic probe? or oscilloscope?

I only have a crappy multi-meter I am afraid.

So is there power to the mosfet drain?. With the meter, is there any voltage to the gate.?