I have this Asus k43u PBL50 LA-7321P REV:1A, 19v is present but on power button and on JBTN1 pin 1 ON/OFFBTN# has 17v instead of 3.3v.on the bios chip there is no 3.3 on pin 8, anyone can help on this please
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Re: Asus k43u no power
One of the components are faulty PU301 PQ303 PQ304 -
Re: Asus k43u no power
I check pq303 pin 1 and pin4 are beeping does this short?Comment
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Re: Asus k43u no power
@Techtiger thanks for the response, replaced pq303 mosfet now no beeping on the pin1 and pin 4 and here is the measurement of RT chip pu301
pin 13= 3v
pin16= 19v
pin17=5v
pin14=2v
pin3=2v
pin8=3.3vComment
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Re: Asus k43u no power
On PQ303 no voltage on S and G on drain it has 1.5v fluctuating voltageComment
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Re: Asus k43u no power
PL301 have B+ 19v but PL305 both sides 0vComment
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Re: Asus k43u no power
PQ305 pin1 S and pin4 G beepingComment
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Re: Asus k43u no power
replaced PQ305 still same issue PL305 no voltageComment
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Re: Asus k43u no power
check resistance to GND on PL303 PL305 left one PAD of each coil & try if the voltage is back if not replace PC305 PC303Comment
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Re: Asus k43u no power
PL303 Pullout 1 side= 11omhs PL305 pullout 1side =2.2ohms tried plugged in with 1 side pullout still no voltage on PL303 and Pl305Comment
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Re: Asus k43u no power
I check pc305 is shorted beeping when i pulled it out same its beeping pc303 is not shorted, I cannot find same value on this cap on my scrapboardComment
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Re: Asus k43u no power
Problem solved!!! replacd PC305 laptop is now turns on and working fine @techtiger thank you for your helpComment
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Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
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Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
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Assuming... -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. đŸ˜…
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi... -
Hello, I have an issue with the motherboard. Specifically, it doesn't power on, more precisely, the POST initialization doesn't occur.
Let me start from the beginning, the motherboard suddenly stopped working one day. There are no beep signals from the speaker, and the debug LEDs are not lighting up. After inspecting it under a microscope and using thermal imaging, I didn't find anything that could be damaged.
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Hello, I have an asus Z97-A motherboard and it doesn't start which was working properly before, the problem isn't related by ram, ram slots or psu (I changed all and nothing work), the exact problem is when you switch it on , it starts and after 1 seconds (no boot or display picture) it's off and then on cycle continuously until you power it off from psu also it's responding to the power switch for turning it off if you keep pressing it 3 or 4 seconds (power button pin has 3.3v) , also when you start it with eatx 12v socket connected this is happening (power cycle also all voltages are resetting...
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