Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
@mcplslg123
I can't find the RTCRST and I don't see an RTC Batt on this board....
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
@techtiger
You might be right this may be the issue. I checked the voltage out few times and some of the pins changed its voltage value (eg. Pin8 & 9) It has voltage at first and after I pulled off the charger and plug it again the voltage becomes 0V. Same thing with Pin 3 & 4 and few other pins....
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
Does it mean that the SIO is Faulty?
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
Yes, I am sure. About this pins 22 96 125 116 also 0V before and after....
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
@SMDFlea
Thanks...
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
Those Pins has 0v before and after press the PWRBTW....
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
@techtiger
Already flash the BIOS still the same. Could you please check the data of the SIO in the image versus the Actual Voltage value? Thank you for the input highly appreciated....
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
Hi, Update: I checked the Resistance to Ground on coils please see the actual value on the image. Those circle in yellow are not working. Can anyone tell me if the resistance value are good. Thanks and stay safe!...
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
Any input would highly be appreciated! Thank you!
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
I check again the laptop and found out that there are 3 more supply that are not Switching so Total of 5 supply that are not working.
Charging Light always On even without battery.
Steady Power LED Light after pressing power button.
Only 19V found in the LCD/LED Connector no other voltage
Could it be the SIO Chip is Faulty?
SIO- ene KB9026Q C
Please anyone could give me an idea. What would be the possible issue on this laptop. Thank you! Stay...Last edited by Techbuddy2020; 08-20-2020, 09:22 AM.
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Re: ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
I also wanted to inject supply to see what is heating up but I do not know where to inject and how much voltage needed.
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ASUS X442U With Power but No Display, 2 of the Power Supplies are not Switching
I don't have a schematic and board view so I take pictures to the power supplies that are not switching.
Unit is with power but no Display.
Main power rail = 19V
Main Bios Pin8 = 3.3V
Power button = 3.3V
No Voltage in RAM= I suppose that supply I label #2 with Voltage In 19V - No Drain Voltage
Label #1 (see image) - with Voltage In 19V - No Drain Voltage
Already checked all the mosfet but its not shorted It seems that they are not switching at all. I think the Driver of those mosfets are Faulty can anyone confirmed....
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