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1.6 Turns On By Itself


prtscn
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The traces that cause the problem are on the bottom of the motherboard.  There are 4 that run along the front edge of the motherboard from the front panel connector grid section: 3V through 7V then go into 8W, 8U, 8T, etc making there way from the front edge towards the back heading to the custom Xyclops chip (System Management Controller) on a 1.6 motherboard.

Generally trace damage occurs from leaked clock cap electrolyte; however, the clock cap on a 1.6 is not near these traces.  It is between the IDE connector and Xyclops chip at location C8C3/C8C1.  So, check the front panel buttons, especially the power button, are they stuck in the pressed in position.

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4 hours ago, prtscn said:

Xbox turn on by itself after plugging to power mains. It is modded with alladin chip oldskool original. Tried different power supply, same thing, i had disconnected power button, controller ports, still, problem remains.

Board looks clean.

What could be causing such thing?

Thanks.

Have you tried it without the chip?

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14 hours ago, KaosEngineer said:

The traces that cause the problem are on the bottom of the motherboard.  There are 4 that run along the front edge of the motherboard from the front panel connector grid section: 3V through 7V then go into 8W, 8U, 8T, etc making there way from the front edge towards the back heading to the custom Xyclops chip (System Management Controller) on a 1.6 motherboard.

Generally trace damage occurs from leaked clock cap electrolyte; however, the clock cap on a 1.6 is not near these traces.  It is between the IDE connector and Xyclops chip at location C8C3/C8C1.  So, check the front panel buttons, especially the power button, are they stuck in the pressed in position.

board is pristine, it happens even if i disconnect power button

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7 hours ago, prtscn said:

board is pristine, it happens even if i disconnect power button

Since it occurs with the power button, front panel cable, disconnected from the motherboard, it has to be a damaged trace on the motherboard.  Somewhere along the path to the Xyclops chip (System Management Controller - SMC) the power button signal trace is being grounded.  

pe_trace_16.jpg

P/E Board Troubleshooting with description of how the front buttons work:

http://web.archive.org/web/20120623010812/http://diy.sickmods.net/Tutorials/Xbox1/Power-Eject_Pinouts/

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10 minutes ago, KaosEngineer said:

Since it occurs with the power button, front panel cable, disconnected from the motherboard, it has to be a damaged trace on the motherboard.  Somewhere along the path to the Xyclops chip (System Management Controller - SMC) the power button signal trace is being grounded.  

Yes. I will put it this xbox to "sometime" pile. :D

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  • 2 months later...
  • 1 month later...

Fixed. Don't know how. I only tested transistors near xcalibur chip. One was funky OPEN line, didn't measure well, but then started to work, after using beeper mode. Strange.

Probably stuck transistor (s), because all traces were OK condition.

Conclusion:

For 1.6, transistors cause such problems.

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