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dirtykash

No Powers Issue

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I have a board that won’t power, had 3 caps gone below the cpu which I have changed for new and a slight trace corroded which I have jumped and still no power at all.

the PSU is good I’ve tried another and swapped power/eject buttons, so where do I look next?

 

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Edited by dirtykash

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32 minutes ago, dirtykash said:

I have a board that won’t power, had 3 caps gone below the cpu which I have changed for new and a slight trace corroded which I have jumped and still no power at all.

the PSU is good I’ve tried another and swapped power/eject buttons, so where do I look next?

 

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Have you tested the other traces as e is the least likely to have an issue?

 

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19 minutes ago, dirtykash said:

All other traces have continuity and visibly look fine 

Does the fan spin like 1/4 turn when you press the power button and that's the only sign of life? or does it do absolutely nothing?

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Fan doesn’t turn at all, seems totally dead.

should I try changing some of the bigger caps on the board?

one thing I did notice is that the 3 copper coiled components on the front of the board looked like they had some residue on the board beneath them, only visible when turning towards the light though...

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On the 20 pin power connector the white and gray wires should have around 3.3 volt.

 


Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

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20 pin plug has a white wire but no grey, and is reading 2.9volts is that correct?

is there anywhere else on the board I should be checking with the multimeter?

Edited by dirtykash

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4 minutes ago, KaosEngineer said:

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Check the voltage level on the blue and orange wires of the PSU connector with AC power connected and the Xbox off (well you can't get it on so not a problem).  Report your readings.

 

Except the pic he posted is not a 1.6 looks to me like a 1.4

 

6168FF5C-8945-49ED-B8DB-17EC9682C779.jpg.d58310e285a9b07c3f190321b3c75f56.jpg

 

Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

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1 minute ago, SS_Dave said:

Except the pic he posted is not a 1.6 looks to me like a 1.4

 

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Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

Oops, for some reason I thought they were talking about a 1.6 motherboard.  I'll post the correct PSU connector voltage levels for a v1.4 motherboard.

 

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psu12-15delta.gif.43d92f536a944a58f14211c096083e91.gif

The wire that's at the location of the gray wire here whatever color it is should be at 3.3Vdc.  One brand of Xbox PSU used different colors; however, the voltage level locations are the same on the connector no matter the wire color used to connect them there.

if you read 2.9Vdc at that location, is a bit too low.  The voltage should be within +/- 5% (3.14 to 3.47 Vdc).

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The power supply is good, I swapped the board into another working console case so I could check the power buttons etc at the same time and it made no difference.

ill check the readings but I think it must be something else on the board besides the 3 caps I changed which were all bulging.

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Must be a damaged or broken power button signal wire coming from the front panel to the motherboard or trace on the motherboard going to the PIC processor (System Management Controller).

Read more about Xbox Power/Eject Troubleshooting at:

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Checked all the traces for the power eject all seem fine, Im going to give the board another clean with alcohol and see if that makes a difference as I’m running out of options here...

Edited by dirtykash

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I don't think cleaning it is going to help.

 

Can you test the wire in the power plug and you should have 1 top left (Gray wire or a Blue wire) that is about 3.3 volt and is 6 down on the right row(Purple wire or a  Gray wire) that is 3.3 volt

This is looking down on the plug with the front panel towards you and the heatsinks away from you.

psu12-15foxlink.gif.c4727070cf690a54a0a3bc467f114570.gif  psu12-15delta.gif.047e33433fe68194bd4b1efab8ff4afd.gif

 

Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

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I am going to say a power supply failure.

When you tested the board in a different Xbox are you sure it was the same model as a version 1.6 has the same power plug but will not run the 1.4 board you have.

 

Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

 

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Tried two identical power supplies both of which power another winbond board I have perfectly

I don’t have any 1.6 models at the moment

Edited by dirtykash

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Can you measure the voltage on the top left pin and any of the black wires while the 20 pin plug is unplugged from the main board. so the AC is plugged in and the power supply is not connected to the Xbox.

 

Cheers

SS Dave


Soft modding is like masturbating, It gets the job done but it's nothing like the real thing.

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Just done this on both power supplies and get 

top left blue -1.6v

tip right white - 3.0v 

I also get 0v on the brown 6st wire down on both

on both power supplies both are deltas and both work fine on my working board

it has to be something else on the board is it worth changing more caps maybe the two bigger ones?

Edited by dirtykash

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1 minute ago, dirtykash said:

Just done this on both power supplies and get 

top left blue -1.6v

tip right white - 3.0v 

I also get 0v on the brown 6st wire down on both

on both power supplies both are deltas and both work fine on my working board

What are the voltages when plugged into your working board? 

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Board startup date: April 23, 2017 12:45:48
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