Author Topic: Wii U Repair, No Power  (Read 22822 times)

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Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #25 on: July 19, 2017, 09:30:03 pm »
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.?

14.5v on the source, 0v on drain and 14v on the gate.

Edit:
If I am not mistaken, that is not correct behavior right?
sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #26 on: July 19, 2017, 09:57:15 pm »
I think we are getting somewhere closer to the answer.

Measure again, that the 4808 mosfet as an example, you can see the 2 drain and 2 source and 2 gate.

measure 1 , see the attached.

[*Black probe to the negative side of the capacitor.]

« Last Edit: July 19, 2017, 10:01:13 pm by Armadillo »
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #27 on: July 19, 2017, 10:05:23 pm »
I think we are getting somewhere closer to the answer.

Measure again, that the 4808 mosfet as an example, you can see the 2 drain and 2 source and 2 gate.

measure 1 , see the attached.

[*Black probe to the negative side of the capacitor.]

Which cap?

And this is a six pin MOSFET package. Seems to be DDGSDD for the pins.
sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #28 on: July 19, 2017, 10:09:32 pm »
I think we are getting somewhere closer to the answer.

Measure again, that the 4808 mosfet as an example, you can see the 2 drain and 2 source and 2 gate.

measure 1 , see the attached.

[*Black probe to the negative side of the capacitor.]

Which cap?

And this is a six pin MOSFET package. Seems to be DDGSDD for the pins.

Associated capacitor of the buck converter, you just now measure voltage of the capacitor [blue arrow].

D1, D1, S1, G1
D2, D2, S2, G2
« Last Edit: July 19, 2017, 10:11:03 pm by Armadillo »
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #29 on: July 19, 2017, 10:14:30 pm »
I think we are getting somewhere closer to the answer.

Measure again, that the 4808 mosfet as an example, you can see the 2 drain and 2 source and 2 gate.

measure 1 , see the attached.

[*Black probe to the negative side of the capacitor.]

Which cap?

And this is a six pin MOSFET package. Seems to be DDGSDD for the pins.

Associated capacitor of the buck converter, you just now measure voltage of the capacitor [blue arrow].

D1, D1, S1, G1
D2, D2, S2, G2

I thought you meant the one with the six pins, my bad.

Seems to be zero, and you meant these two joints correct?
sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #30 on: July 19, 2017, 10:15:58 pm »
black probe to the capacitor, red probe to each of the ic pins from 1 to 8.
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #31 on: July 19, 2017, 10:18:57 pm »
black probe to the capacitor, red probe to each of the ic pins from 1 to 8.

I got 0v on everything.
sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #32 on: July 19, 2017, 10:25:19 pm »
black probe to the capacitor, red probe to each of the ic pins from 1 to 8.

I got 0v on everything.

There you go, no supply to the drain from some power supply somewhere.
Now I need you to find out why. So you trace the only the Drain Pins back to the another power supply component, so that we can identify the failing circuit or fuse section that actually failed.
Take a photo of the section.
 
« Last Edit: July 19, 2017, 10:28:12 pm by Armadillo »
 

Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #33 on: July 19, 2017, 10:43:50 pm »
black probe to the capacitor, red probe to each of the ic pins from 1 to 8.

I got 0v on everything.

There you go, no supply to the drain from some power supply somewhere.
Now I need you to find out why. So you trace the only the Drain Pins back to the another power supply component, so that we can identify the failing circuit or fuse section that actually failed.
Take a photo of the section.


See example of trace;

For the ohm,  you must power off and measure from the vias [black probe] and find out where it is connected to example RED probe to each of the positive side of the bigger capacitors somewhere [it is bound to be connected to the +ve side of some capacitor somewhere.]
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #34 on: July 19, 2017, 10:51:48 pm »
black probe to the capacitor, red probe to each of the ic pins from 1 to 8.

I got 0v on everything.

There you go, no supply to the drain from some power supply somewhere.
Now I need you to find out why. So you trace the only the Drain Pins back to the another power supply component, so that we can identify the failing circuit or fuse section that actually failed.
Take a photo of the section.

This seems to be all the connections, up to the chips.


Also, these pins are shorted. D2 and S1 it looks like, is that normal?
sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #35 on: July 19, 2017, 11:04:15 pm »
See previous attached, measure the d1. [d2 may not be used, maybe] I don't know,
So let's measure d1 to be sure.
see previous attached example.

Edit: someone with the schematic may be laughing at us. LOL ....  :-DD
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #36 on: July 19, 2017, 11:20:22 pm »
See previous attached, measure the d1. [d2 may not be used, maybe] I don't know,
So let's measure d1 to be sure.
see previous attached example.

Edit: someone with the schematic may be laughing at us. LOL ....  :-DD

Woops, wrong picture.

sudo dd if=/dev/zero of=/dev/sda
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Offline Armadillo

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Re: Wii U Repair, No Power
« Reply #37 on: July 19, 2017, 11:48:03 pm »
Maybe you should write to Nintendo to ask for the schematic.

Without the schematic, it is definitely very difficult communicating it this way.
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #38 on: July 19, 2017, 11:49:05 pm »
Maybe you should write to Nintendo to ask for the schematic.

Without the schematic, it is definitely very difficult communicating it this way.

I'll try.
sudo dd if=/dev/zero of=/dev/sda
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Offline urbis

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Re: Wii U Repair, No Power
« Reply #39 on: July 21, 2017, 03:30:46 pm »
No chance of them supplying that.
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #40 on: July 21, 2017, 06:45:47 pm »
No chance of them supplying that.

Yeap, completely ignored. Guess I should trace out sooner if the schematic myself?
sudo dd if=/dev/zero of=/dev/sda
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Offline strawberry

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Re: Wii U Repair, No Power
« Reply #41 on: July 21, 2017, 07:22:53 pm »
If that controller is MAX5066
Check enable pins 15 and 28, while enabled should read above 1.225V
Check reference voltage source 3.3V on pin 6, this will indicate that IC is in active state

If there is no voltage on C1244/C1266, using continuity test try to find out where this supply come from all over the PCB(it has internal layers)
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #42 on: July 22, 2017, 01:49:40 am »
If that controller is MAX5066
Check enable pins 15 and 28, while enabled should read above 1.225V
Check reference voltage source 3.3V on pin 6, this will indicate that IC is in active state

If there is no voltage on C1244/C1266, using continuity test try to find out where this supply come from all over the PCB(it has internal layers)

I'll check this when I have a chance.

Any tips for board reversing other than use a probe?
sudo dd if=/dev/zero of=/dev/sda
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Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #43 on: July 28, 2017, 01:44:05 am »
I've been slowly reverse engineering some power stuff, what would a decent meter with the beeping continuity test be? It is kind of hard to check the resistance and keep an eye on the probes at the same time.
sudo dd if=/dev/zero of=/dev/sda
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Offline strawberry

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Re: Wii U Repair, No Power
« Reply #44 on: July 28, 2017, 08:02:54 am »
I am using cheap/decent MASTECH MS8286 . I can not complain about continuiti beep speed. And if has many other useful funtions for repair.
PS.But I am not happy with indication of mismatched test leads

You coud use X-ray for reverse your board :)

There are Dave Jones videos about multilayer  PCB reverse enginering
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #45 on: July 28, 2017, 04:45:25 pm »
I am using cheap/decent MASTECH MS8286 . I can not complain about continuiti beep speed. And if has many other useful funtions for repair.
PS.But I am not happy with indication of mismatched test leads

You coud use X-ray for reverse your board :)

There are Dave Jones videos about multilayer  PCB reverse enginering

I don't have access to X-Rays. At least most of the stuff is on the outer two layers it seems. Over only found two things in the inner layers so far.

I'll check out that meter.
sudo dd if=/dev/zero of=/dev/sda
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Offline EPTech

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Re: Wii U Repair, No Power
« Reply #46 on: July 29, 2017, 11:29:40 am »
Hi there,

I was re-reading this thread and I find it strange that your power input is AC. I do not see a rectifier anywhere. Are you sure the device does not need a DC source? Ask your friends power supply and try.

Happy hunting.
Kind greetings,

Pascal.
 

Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #47 on: July 29, 2017, 04:23:29 pm »
Hi there,

I was re-reading this thread and I find it strange that your power input is AC. I do not see a rectifier anywhere. Are you sure the device does not need a DC source? Ask your friends power supply and try.

Happy hunting.

It takes DC, there is a power brick.
sudo dd if=/dev/zero of=/dev/sda
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Offline gudenauTopic starter

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Re: Wii U Repair, No Power
« Reply #48 on: July 30, 2017, 02:54:40 am »
Anyone happen to have a pinout/datasheet for this chip?
sudo dd if=/dev/zero of=/dev/sda
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Offline gnavigator1007

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