Hello everybody . I have an Asus laptop that turns on but does not display the screen. I continued with the voltage measurement.19 v is ok 3.3v is ok 1.5 volts in RAm is ok. but in cpu I do not have 1.0v or 1.2v ... how much can the processor have. And the processor was cold ,, .. After some measurements I noticed that PQl8104 was short. I removed it and replaced it with mosfet 6414A I do not know if it is a choice but please tell me .. I put it in the charger I see that the cpu is hot but there is no image. I did the bios that I found in this forum but again the same problem After the voltages in Pl8102 it is 0v and in Pl801 it is 0 v..This laptop has NCP81216A chip. Please tell me what I can do to diagnose the problem. Thank you Asus X541UVK REV 2.0 (1).rar This is board view ....And the FAn not spining . I try to turn of laptop but turn on agin for 2 sec.
Asus x541u vcc core missing
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Re: Asus x541u vcc core missing
B+ is the main 19v rail.
0.3 ohm is a short. This plus CPU heating up is not good news. Interrupt the VCORE power line as close to the CPU as you can and measure the voltage on it. If the voltage is normal after you replaced the mosfet, and the mosfet you replaced was the high side switch, then there is a good chance the 19v went straight into the CPU and you now have a donor board...Comment
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Re: Asus x541u vcc core missing
This means there's a short in the CPU and its pulling down the voltage, which is why you should test it by interrupting the VCORE line to verify it. Pull out the coil or some other component in the path to the CPU to verify. However, it does appear that your CPU is dead...Comment
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Re: Asus x541u vcc core missing
I dont know what PL801/802 do. I cant open boardview because im at work.
What do you mean you "closed" the line? The 0v you're seeing is because the short on the CPU sends the voltage to the ground. This is why I am telling you you need to _disconnect_ the CPU to verify that the voltage goes back to normal when the CPU is disconnected.
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Re: Asus x541u vcc core missing
ok pl801 and 802 are behind the mosfet that supply the processor with voltage. that should give 1.5 volts or less .. when I disconnect these I have no voltage. yes it is logical not to give because the cpu is in shorttt ... In processor i have 1.0 v coming from 2 points pjp 8104 and 8303. when I disconnect these laptops it turns on for a while and turns off .. now I have left only pjp 8303 connected and the cpu heats up a bit. pjp 8104 connect +vccsa and +vcccio_cpu pjp8303 connect +1.0vo and +1.0vsusLast edited by arber1232; 12-04-2020, 06:27 AM.Comment
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Re: Asus x541u vcc core missing
I dont know what PL801/802 do. I cant open boardview because im at work.
What do you mean you "closed" the line? The 0v you're seeing is because the short on the CPU sends the voltage to the ground. This is why I am telling you you need to _disconnect_ the CPU to verify that the voltage goes back to normal when the CPU is disconnected.Comment
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Re: Asus x541u vcc core missing
ok pl801 and 802 are behind the mosfet that supply the processor with voltage. that should give 1.5 volts or less .. when I disconnect these I have no voltage. yes it is logical not to give because the cpu is in shorttt ... In processor i have 1.0 v coming from 2 points pjp 8104 and 8303. when I disconnect these laptops it turns on for a while and turns off .. now I have left only pjp 8303 connected and the cpu heats up a bit. pjp 8104 connect +vccsa and +vcccio_cpu pjp8303 connect +1.0vo and +1.0vsusComment
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Re: Asus x541u vcc core missing
0.3Ohms on cpu line may not be short as cpu is soldered. +1.8V is present?? Check all pwrgood signals.Comment
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Re: Asus x541u vcc core missing
CPU VCore should be around 6 ohms to ground.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Asus x541u vcc core missing
PL8101 is iGPU VCore but it should be around the same value than CPU VCore.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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