• Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

It is currently 30 September 2025, 13:06

Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

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#1 Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 11 September 2025, 19:39
Hi guys, I have this PC that won't turn on. The PC has a short on +3VA_EC, resulting in a short on IT5125VG-128.

I replaced IT5125VG-128, but the PC still won't turn on. The PS_ON_LS signal to enable +3VA_EC is missing.

The PS_ON_LS signal comes from U3201 SLG4E44058VTR, which I can't find any information about.

Thanks for your help.

Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Google Adsense [BOT] • 11 September 2025, 19:39

#2 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 12 September 2025, 14:06
Measure the voltage on PJP9704 (located near IT5125VG) while the power supply is connected (no battery connected at this stage).

#3 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 12 September 2025, 20:51
Vogelek23 wrote:PJP9704
3 v.

#4 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 12 September 2025, 21:17
Now, measure the voltages to ground at the points marked below. Same power conditions as before.
Image

leonemax81 wrote:SLG4E44058VTR, which I can't find any information about.
Below you can find an example of application for this chip.
Image

#5 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 12 September 2025, 22:05
Vogelek23 wrote:Now, measure the voltages to ground at the points marked below. Same power conditions as before.

1: SL3204: 0 V.
2: R5809: 0 V.
3: JD5901: 3.3 V.
4: D3204: 3.1 V.
5: D3206: 039 MV.
6: D3203: 0 V.

#6 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 12 September 2025, 22:12
Please post a clear photo of U3201 with its surrounding area (like on the boardview screenshot in post #4).

#7 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 12 September 2025, 22:24
Please post a clear photo of U3201 with its surrounding area (like on the boardview screenshot in post #4).

Image

#8 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 12 September 2025, 22:36
Measure the voltage to ground on pins 1, 4 and 8 of PQ8811.

#9 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 12 September 2025, 22:46
Vogelek23 wrote:PQ8811

PIN 1: 0 V.
PIN 4: 0 V.
PiN 8: 0 V.

AC_BAT_SYS Pin 12 PU8701: missing

#10 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 12 September 2025, 23:20
What is the voltage to ground on PQ9502 pin 5 (drain)?

#11 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 12 September 2025, 23:40
Vogelek23 wrote:PQ9502 pin 5

20 v.

#12 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 13 September 2025, 11:03
Disconnect power, allow 1-2 minutes to discharge the capacitors and measure the resistance to ground on pin 5 of PQ8902. If the resistance is high (in kΩ or MΩ range) connect power supply only and measure the voltage to ground on pins 4, 8, 12, 13, 14, 15, 16, 17, 18, 21, 22, 24, 25 and 31 of PU8901 charger (ISL9241HRTZ). Then, connect the battery + power supply and repeat measurements on the same pins of PU8901 as previous.

#13 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 13 September 2025, 11:32
Vogelek23 wrote:pins 4, 8, 12, 13, 14, 15, 16, 17, 18, 21, 22, 24, 25 and 31 of PU8901
PQ8902 PIN 5: 1600 Mohm.

PU8901 SENZA BATTERIA:
PIN 4: 0 V.
PIN 8: 0 V.
PIN 12: 0 V.
PIN 13: 0 V.
PIN 14: 20 V.
PIN 15: 20 V.
PIN 16: 0 V.
PIN 17: 20 V.
PIN 18: 0 V.
PIN 21: 0 V.
PIN 22: 0 V.
PIN 24: 0 V.
PIN 25: 0 V.
PIN 31: 0 V.

PU8901 BATTERIA:
PIN 4: 0 V.
PIN 8: 0 V.
PIN 12: 0 V.
PIN 13: 0 V.
PIN 14: 20 V.
PIN 15: 20 V.
PIN 16: 0 V.
PIN 17: 20 V.
PIN 18: 0 V.
PIN 21: 0 V.
PIN 22: 0 V.
PIN 24: 0 V.
PIN 25: 0 V.
PIN 31: 0 V.

#14 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 13 September 2025, 11:39
Replace PU8901 and remeasure the voltages on the same pins (without battery, only power supply connected).

#15 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 13 September 2025, 11:54
Vogelek23 wrote:PU8901

not available now an ISL9241HRTZ I have to order it, can I put an equivalent chip?

#16 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Vogelek23 • 13 September 2025, 12:08
Unfortunately, no. It must be exactly the same chip.

#17 Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by leonemax81 • 17 September 2025, 12:46
leonemax81 wrote:ISL9241HRTZ

Replaced ISL9241HRTZ, now the voltages, +3VA_EC, AC_BAT_SYS, P_3VADSW_LX_30, P_5VSUS_LX_30, are present, the PC has a consumption of 0.056 amps and the CPU is overheating in the chipset area, I think the CPU is dead.

Image

Re: Asus X7400PC Rev 2.2 No power IT5125VG-128 Short

by Google Adsense [BOT] • 17 September 2025, 13:39
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