Hi,i got FX505du,it charges battery but when power button is pressed it has no led,dead totally,i have checked and 20v is present near gpu caps,caps above cpu are shorted,it is ryzen 7 with 1660ti gpu.What to check next?
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Re: Asus tuf FX505du charging,but wont power on
Check at the coils whether any power rail comes up when you press the power button and share what voltages are present before/after pressing the power button. Maybe you can tale a picture of the board and write the values near the coils. -
Re: Asus tuf FX505du charging,but wont power on
https://ibb.co/x1kt0t4
Hi,i cannot get powered it because power button is in keyboard,but i have tried and i get 20v like on picture,on the other side i have 3.3v near ITE chip,on keyboard connector is 5.2v but this signal goes to 35ohm short and again in circle...I have spotted some liquid spill near usb ports,i cleaned it but nothing....something is suspicious with 5v here...
Gpu has 0.7ohm resistance on coil,CPU 4.2ohm...
In the meantime i cleaned all usb ports,hdmi,even took those realtek chips,cleaned and soldered in place ,but no go...has somebody boardview cad,brd for this board ( FX505DU V2.0) ?Comment
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Re: Asus tuf FX505du charging,but wont power on
Is CPU and GPU resistance to ground too low?Comment
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Re: Asus tuf FX505du charging,but wont power on
If the power-button is inside of the keyboard, then find the corresponding pins. just needs some research and the knowledge howto use your multimeter. Also we can't do anything with the information where the 20V is present. If it is present at the current sense resistor, then it is present on the whole board.
The only thing we now know is that the main power rail is present and the Embedded controller gets voltage. The other observations are random, have no relations and lack descriptions.
Resistances of GPU and CPU Core rails are okay but you didn't shared any measurement from the coils, so what do you expect now?
i can't do more than to ask for measurements, to hope for sharp eyes and a clear mind.Comment
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Re: Asus tuf FX505du charging,but wont power on
I tried press on CON3104 pin 5+pin6 but all is the same,voltage on coils under cpu and above gpu are 0v,pin 5 is 3.3v,around ITE8987 i have 3.3,1.78,and 2.2v,those first two mosfets before current resistor r005 have 20v,only one coil 3R3 1947 under battery connector gets 0.215v,nothing gets hot on board..
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Re: Asus tuf FX505du charging,but wont power on
and i found some shorted caps,and this is place where was liquid damage(burnt paper was by me,cleaning mosfet with hot air and flux)...
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Re: Asus tuf FX505du charging,but wont power on
Those 2 caps from left goes to pin 26(+5VS_AUDIO),and caps on right on pin 41(PVDD1) which is in loop with pin 46(PVDD2)...all on +5VS...Comment
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Re: Asus tuf FX505du charging,but wont power on
Is it safe to inject some voltage on + side of shorted cap,if yes how much volt,amp?ThanksComment
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Re: Asus tuf FX505du charging,but wont power on
So you was or you still are dealing with a (partial) shorted +5VS. What's the actual situation? Where is the blown component located and what are the measurements there right? There are schematics and boardview available, so should be normally easy to trace.Comment
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Re: Asus tuf FX505du charging,but wont power on
Everything is the same ,i get 20v rail all the time on board,i removed cmos battery and computer reboots all the time,coils near cmos 3r3 gets 5.2v when rebooted and fails to zero for 1-2sec,3.3v is near it and it is doing the same...im bad at reading schematics,i have some pdf but i can read only ic-s ,following path is hard for me...Comment
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Re: Asus tuf FX505du charging,but wont power on
Alright, with the Injecting you have seperated the +5VS_AUDIO from +5VS by blowing up L3603. So yes, the short at +5VS_AUDIO obviously has disappeared although the Short at +5VS is still present.
Since I am a fan of constructive troubleshooting with _values_, I'd start with a good old resistance to GND measurement of +5VS to have something to start with. Ohms mode, range 200, without power.Comment
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Re: Asus tuf FX505du charging,but wont power on
Its 0.5ohm,fluctuating between 0.4-.07ohm,i measured +5v coil near cmos 3r3 ,when off 15kohm,when on 35ohm...Comment
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Re: Asus tuf FX505du charging,but wont power on
The +5VALW is NOT the +5VS. Usually these rails are seperated through load-switch. Also it isn't a good idea to measure resistance while the device is powered. It can damage the multimeter and the board, too.
So injecting time again, at a good accessible point of the +5VS. Can be still anything but with some luck just a bad capacitor.Comment
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Re: Asus tuf FX505du charging,but wont power on
So i can inject on this cap near blown L3603,what voltageshould i use?Comment
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Re: Asus tuf FX505du charging,but wont power on
Yes and as before: 1V and start with 2 Amps maybe. You can still raise the Amps if nothing "happens" but you must NOT raise the voltage.Comment
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Re: Asus tuf FX505du charging,but wont power on
Well,i have no bench Ps so i improvise with 1volt battery about 1 amp,but nothing gets hot...3v battery would not be good idea?Comment
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Re: Asus tuf FX505du charging,but wont power on
Well, this is out of the area how I test a board. Basically it isn't a good idea to go above 1V as long as the fault is not clear.... or whether there are no options left.
Maybe someone else can give advice for this question.Comment
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