Hello, I'm currently stumped as I have this Asus laptop and none of the three usb's work ( all on one side in a row ) they is no IO board so no other usb's to use. I've checked all the 0 ohm resistors and they are good I replaced the PMIC and that did nothing. I'm looking at the low dropout regulator which is the last major thing in close proximity the issue is I don't know how to begin testing it and don't want to keep replacing stuff hands over fist. (G9661). Does anyone know what im missing? also the USBs dont work atall cant boot off a flash drive and bios says USB N/A in two slots.
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Re: gl731g no usb
Do you have a VBUS voltage of 5 volts on the USB connectors? -
Re: gl731g no usb
no 5v to usb aswell as all caps lining the ports are shorted to groundComment
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Re: gl731g no usb
Post a pic of the area with these parts.
Trace the USB connector vbus pin to the closest USB load switch. Often, the low quality USB load switch will be damaged and must be replaced. They are very inexpensive but being an Asus board, the schematics are rare to find. You can use diode mode to hunt down the load switch.
Meter in diode mode will tone beep if the probes are shorted. Next, one probe on Vbus connector pin. Other probe to nearby parts till you hear a tone beep.
Suspecting the USB load switch will be 5-6 pins and likely sot23-5/sot23-6 package.
Share the topside markings of the load switch after it is found.Comment
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Re: gl731g no usb
See attached - your board layout may be similar.
If it is, share the topside markings of this IC (USB load switch).Attached FilesComment
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Re: gl731g no usb
Attached FilesComment
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Re: gl731g no usb
What are the topside markings of this component?Comment
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Re: gl731g no usb
C34ahComment
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Re: gl731g no usb
This appears to be an ESD transient suppressor. Flux and remove off the board with your hot air tool to remove it from the equation.
Continue to trace the VBUS pin to other nearby components to locate the USB load switch.Comment
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Bought myself a project thing. Apple MBP16" A2141 820-01700
No shorts, no visible waterdamage.
Dead. no history.
All USBC ports do 20V and charging battery.
If you plug battery/charger PPBUS is 12.6v and all power rails like RTC, 3v3, 5v etc are present. U7800 PMIC all voltages are present APART from PPVCCPRIMCORE_PRIM_REG (not sure if it has to be present at this stage?! resistance is 40 Ohm). SSD 2.5, 0.9, 1.8 are present on both wings. Charger meter shows 30ma or something like this on charged battery.
But what PMIC does is that it power cycles(dropping to... -
Hello Gentlemen,
I am working on an apple MacBook A2442 board pn 820-02098-A with a visible short on the PMIC U7700 MVK-PLUS as per the schematics
I have a donner board from apple macbook pro m1 A2338 PN 820-02020 and I saw that the PMIC U8100 TMLT46B0-JPE could be a possible replacement for the U7700
Can you please help me confirm if the U7700 can be replaced with U8100 ?
APL1098 is it the same as APL1096
Thank you very much in advanced
Ahmad -
I have an Intel STK1A32SC Compute Stick... and a baaad case of The Stubborns
somehow I always 'forget' until just after it's too late that (a) the slightest application of heat to the power button shorts it internally, permanently, rendering the system unbootable, and (b) removing the button entirely, being a tiny tiny tiny momentary 'tact' switch, and surface-mount to boot, invariably destroys the support circuit for it, immediately adjacent.
Ooooops
I can read datasheets and understand electronics reasonably well; the AXP288 is the PMIC -- power management... -
Got a 2021 14" MacBook Pro M1 here that died suddenly. No signs of liquid damage. However there was a strong burned smell. Upon removing and flipping the board I found a burned cap C9400 near PMIC U9300. Photos attached. Should I just proceed with replacing U9300 and some of the surrounding caps? Also, I don't have any donor boards from this generation of MacBooks, maybe could locate a compatible cap from an older touchbar model? -
Hello.
Havr this Gigabyte rtx4090 Gaming that consume only 220w on full load and show only 1.6W power on PCIe rail
I need to identify PMIC with marking S56500
Comment