It's 1.3 KOhm
I measured :
+3VAO = 3.3 Volt
+5VAO = 2,8 Volt
The weird thing is that, after plugging and then removing the charger, resistance of +5VAO went very low to 11 ohm, but gradually get higher after some time back to 1800 ohm...
abuhamza
Member
Last Activity: 01-06-2025, 05:04 AM
Joined: 12-07-2017
Location: Jakarta
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Asus X407UBR No Power
I have a ASUS X407UBR will not power up.
I have measured:
+3VA = 3.3 V
+3VA_EC = 0,8V
Need guidance where to start troubleshooting next. thanks
[COLOR=#8e44ad][B]LINK to schematic/boardview[/B][/COLOR] [url]https://www.badcaps.net/forum/troubleshooting-hardware-devices-and-electronics-theory/troubleshooting-laptops-tablets-and-mobile-devices/schematic-requests-only/73053-hello-asus-x407ubr-rev-2-0#post1751795[/url]I have a ASUS X407UBR will not power up.
I have measured:
+3VA = 3.3 V
+3VA_EC = 0,8V
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I'm a beginner in the laptop/pc repair business, learn alot from this forum, few times solved problems with help with other in the forum.Leave a comment:
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Re: Lenovo G40-45 Dead, low voltage on B+ Need help
And weird thing I just noticed, even after i remove the charger, there is still voltage on B+ for a while and it is dropping from 0.9v to 0v very slowly.Leave a comment:
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Re: Lenovo G40-45 Dead, low voltage on B+ Need help
And i read from the power sequence, that B+ created from PU401. But there is no PU401 in the schematic that I can find.
So, what created B+, or which component that created B+Leave a comment:
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Re: Lenovo G40-45 Dead, low voltage on B+ Need help
PQ6 = all pins have 20v
PQ7 = Pin 1-4 has 20v, pin 5-8 has 0.9v
Where to measure voltage sensing? sorry, i'm new in this stuff...Leave a comment:
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Re: Lenovo G40-45 Dead, low voltage on B+ Need help
Pin 1 and 2 = 20v
Pin 3-5 = 0v...Leave a comment:
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Lenovo G40-45 Dead, low voltage on B+ Need help
I have a Lenovo G40-45 (nm-a281p) motherboad which is dead. I measure there is only 0.9v in B+ while the Vin is 20v
Please help, where to start troubleshoot the problem, thanks.... -
Re: Sony Vaio MBX-224 with +5valw and +3valw voltage drop
Do you mean measure it in diode mode? or in ohm mode? i'm sorrry i am new in this things.
I measured both PL16 and PL17 in diode mode with red probe on ground, and black probe on the coil, the result is this :
PL16 = 240 ohm
PL17 = 240 ohm
But when i use ohm mode, with black probe on ground;
PL16 doesn't show fix number in the multimeter, it shows random resistance
PL17 = 2,7 k...Leave a comment:
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Sony Vaio MBX-224 with +5valw and +3valw voltage drop
Hi guys,
I have a sony vaio mainboard with this symptoms; when i plugged in the charger, the +5valw and +3valw have normal voltages, 5v and 3.3v.
But when I press the power button, the 3.3v drops to about 1.4v, and the 5v drops to around 0.1v, and in the dc power supply shows 0.13 amps.
Any help would be appreciated.... -
Re: Axioo Neon HNM (ECS_MB40IAX_MB40II4) Dead
In Addition, OZ8618 (PU1) in pin 11 (PA) has 25v, and pin 12 (PB) has no voltage.Leave a comment:
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Axioo Neon HNM (ECS_MB40IAX_MB40II4) Dead
I have this mainboard that would not turn on. The DC Power Supply shows 0.003 Amps. I Checked there is no voltage in battery slot pin, and there is no voltage in 5VA and 3VA.
I am new in board repair, so where do i start?
Thanks in advance... -
Re: New Members - please post your introductions here
Hello everyone, looking forward to learn new things!Leave a comment:
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Re: How to read and understand schematic diagram.
Will check this. Thanks for the information....Leave a comment:
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