Xbox 360E model:1538 not turning on

[tsiga]

Hello everyone!

I have two same console with same error. Not turning on.
Model:Xbox 360E model:1538
The power birck led is lights on amber.- Tested with this methood. Link
I measured the power button circuit to power panel connector, everithing looks good. local console guru said, southbridge error--> I replaced it with new.. same error.

Can't find schematic or any document for this error.
Can somebody help me?

[stj]

Re: Xbox 360E model:1538 not turning on

is the psu giving 12v?

[tsiga]

Re: Xbox 360E model:1538 not turning on

Yes,
5V stand by is present, and when the psu is on, 12V present based on video

[lotas]

Re: Xbox 360E model:1538 not turning on

A common cause in slims (does not turn on) is a problem in the 3.3v DC converter (in 5v - out 3.3v).

[tsiga]

Re: Xbox 360E model:1538 not turning on

Thank you.
I measured 5V is present the 3.3V just 0.28V
I not found this tiny voltage regulator name, type or any datasheet.
Is there any solution to bypass or change to other components?
I found article in which he mentions, to replace with AMS1117.. it is working?

[lotas]

Re: Xbox 360E model:1538 not turning on

Yes, you can put AMS1117 3.3 with a fixed voltage of 3.3v

"J7(X)" is "RT8057"

Sometimes they put: "CEY" - That is "TPS62560"

[tsiga]

Re: Xbox 360E model:1538 not turning on

Thank you, so much!

[tsiga]

Re: Xbox 360E model:1538 not turning on

working!
Thanks!!

[sam_sam_sam]

Re: Xbox 360E model:1538 not turning on

working!
Thanks!!

I like your repair this has a very professional look to it
One more item that did not end up in the landfill

Very nice work

[lineslim]

Hello,
I have the same problem (xbox360 does not power on) with the same 1538 board. I checked voltage on the RT8057 and I have 5V on leg 6 and 3.4V on number 1. Any suggestions on what to look for next?
I can mention that when I happened to touch the 5 legs component next to the rt8057 with my finger, the fan started spinning for like a second or so.
Help on continued trouble shooting is greatly appreciated.

[lotas]

I checked voltage on the RT8057 and I have 5V on leg 6 and 3.4V on number 1.

At 6 pin you can't have 5v because this pin is ground.

[lineslim]

At 6 pin you can't have 5v because this pin is ground.

Yes, you are correct, I have 5V on pin 5, not on 6.
I hope someone will have a clue to what the problem is. I think it must mean something that the fan jumps into life when touching the adjacent component....

[lineslim]

Update: I tested with another rf board from a working unit, no change. Green light on the on/off button for 2s after pressing it, then nothing, fan does not spin.

[lineslim]

Found the problem: broken hdmi port, pins shorted to ground

[lotas]

Found the problem: broken hdmi port, pins shorted to ground

And this needs to be checked first, as well as the USB ports.