Xbox one s power on 1 second and turn off

[xiran64]

Hi to all!

I´ve an xbox one s, wich when you press power button, it poer on, but power off quicky.

I,ve remove the 3 big mosfets, and the lines in the picture, are grounded...

Some body knows, if the apu is in short? Or what voltaje can i inject to check if some component in the line produces the short? thx in advice!

 

[xiran64]

If i check, this point have low impedance

Someboy know, wich voltage needs here?

 

[xiran64]

If i check, this point have low impedance

Someboy know, wich voltage needs here?

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NCP4205 I2C unreachable -> Check R9C29, R9C30, R9D23, surrounding traces, check V_5P0_GATED available? (R9D30, Q8D1), replace U9C2

 

[squallwu]

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[td]NCP4205 I2C 不可达 -> 检查 R9C29、R9C30、R9D23 及周围线路，检查 V_5P0_GATED 是否可用（R9D30、Q8D1），如有问题，请更换 U9C2。[/td]
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您的机器修好了吗？我还在 YouTube 上看到一个视频，说 U9C2 需要更换。

 

[xiran64]

您的机器修好了吗？我还在 YouTube 上看到一个视频，说 U9C2 需要更换。

Hi!

I already ordered that ic, i put an NCP4204 from a normal xbx1, with same error, We need to wait for the IC to arrive.

 

[xiran64]

Hi!

I already ordered that ic, i put an NCP4204 from a normal xbx1, with same error, We need to wait for the IC to arrive.

NCP4205 arrived, same result...

NCP4205 I2C unreachable ->

Check:
R9C29 37 ohms
R9C30 0.2 ohms
R9D23 9.95k
surrounding traces, check V_5P0_GATED available?
R9D30 34.7k
Q8D1 "No short beetwen pins"
replace U9C2 **** done

Post automatically merged: Nov 26, 2025

NCP4205 arrived, same result...

NCP4205 I2C unreachable ->

Check:
R9C29 37 ohms
R9C30 0.2 ohms
R9D23 9.95k
surrounding traces, check V_5P0_GATED available?
R9D30 34.7k
Q8D1 "No short beetwen pins"
replace U9C2 **** done

Voltages when power on 1 second off:

MEMIO: Voltage temporally
CPUCORE: 0V
NBCORE: Voltage temporally

Signal in mosfet drivers pin 7&6:

U9D2 0v, 0.36v to 0v
U9E1 0V, 0V
U9E2 0V, 0V

Some videos, suggest, defective npc, i´ll resolder the ic

 

[xiran64]

NCP4205 arrived, same result...

NCP4205 I2C unreachable ->

Check:
R9C29 37 ohms
R9C30 0.2 ohms
R9D23 9.95k
surrounding traces, check V_5P0_GATED available?
R9D30 34.7k
Q8D1 "No short beetwen pins"
replace U9C2 **** done

Post automatically merged: Nov 26, 2025

Voltages when power on 1 second off:

MEMIO: Voltage temporally
CPUCORE: 0V
NBCORE: Voltage temporally

Signal in mosfet drivers pin 7&6:

U9D2 0v, 0.36v to 0v
U9E1 0V, 0V
U9E2 0V, 0V

Some videos, suggest, defective npc, i´ll resolder the ic

Ok, news:

SVC signal, is not generated...

This pin signal, is comming from APU