Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Can I replace the CPU from Lenovo to Asus with the same number on ym3500c4t4mfg?...
alb3rt121
Member
Last Activity: 03-20-2025, 09:57 AM
Joined: 02-13-2022
Location: Kazimierza
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Unfortunately it was not possible to fix it. I replaced the RT8231AGQW and made the measurements. Everything looked fine. I connected the power supply and the LED light came on for a moment. After two seconds, the short-circuit protection was activated in the power supply. I took the measurement again. It turns out there is a shorted + 19v line through the DDR and VVT power mosfet. I removed the mosfet and made a measurement - still short circuit. I tried to inject 1.2V. The circuit was drawing 6A but nothing...Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
I just found out how MOSFET works using diode and resistance mode. lol. By the way, I found a MOSFET with a low resistance between G and S. This is the VVT and DDR power supply (I don't know what VVT is) After the measurements, it turned out that the U8300A chip
RT8231BGQW legs 16, 17 are mosfet controlled. The IC didn't look very good, it had changed color like burnt. I have ordered parts so I will reply soon. May it work.Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Thank You for help.
1. The schematic of the Fx505DU is the closest to the DD.
2. I use oryginał 150W power sipply.
I will let you know when I take the measurements.
I am attaching the diagram of the FX505DU board...Last edited by alb3rt121; 03-13-2022, 12:57 PM.Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Can such symptoms be caused by a damaged SIO?
I noticed that on IT there is no 3.3V on legs 11, 83....Last edited by alb3rt121; 03-13-2022, 11:19 AM.Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
You mean + 3VSUS + 5VSUS?...Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
The CPU is slightly warm, as I said, but not hot.
I will check the converters as soon as I can. I will let you know about the results.
I would like to know why there is a low resistance of 0.9 ohm on the GPU power supply. This is normal?Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
My power supply is 4 digit (0.000). After put voltage to motherboard 0.045A
The measurements are in the attachment.
Coil at CMOS battery - 122 ohms. I forgot to add in the photo...Last edited by alb3rt121; 03-12-2022, 04:11 AM.Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
I found a pwm controller.
Measurements in the attachment...Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Measurement
CLR +19v- Present
LDO +3v - Not preset. I can't find where it comes fromLeave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
I have already flashed the bios from Asus website once. Without result.
I also noticed that pressing the ON button causes the voltage on the IT 107 leg to drop from 3.5V to 3.2VLast edited by alb3rt121; 03-08-2022, 04:43 PM.Leave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
The voltage on the USB port is not present. I checked in the diagram where the control signal for the power transistor comes from. It comes with the CPULeave a comment:
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Re: ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
Unfortunately, I don't have a keyboard now.
On another forum I was told that the CPU might be damagedLast edited by alb3rt121; 03-08-2022, 12:27 PM.Leave a comment:
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ASUS Tuf Fx505dd rev2. Does not start up, does not charge the battery.
At the beginning, as a new user, he would like to welcome the group of forum users. I hope you will help.
The topic concerns
Model: Asus TUF Gaming FX505DT
Platform: FX505DD rev 2.0
Processor: Ryzen 5 3550H YM3500C4T4MFG
Graphics: Nvidia GTX 1650 N18P-G0-A1
KBC: IT8987E
BIOS chip: MX25U12873
In the laptop, after connecting the power supply, only the keyboard is illuminated.
No reaction to the switch, no diodes light, no battery charging.
Current consumption after applying voltage 0.04A without frames and...Last edited by alb3rt121; 03-08-2022, 12:17 PM. -
Re: New Members - please post your introductions here
Hello everyone. I registered here because I want to learn motherboard repair. I hope with your help it is possible. GreetingsLeave a comment:
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