Hi, I am working on a Hp 15-cs2023ca Laptop, Logic Board # DAG7BMB58C0 REV: C. The motherboard works fine but the USB 2.0 does not work at all & gives Error "unknown usb device (device descriptor request failed)" in Windows 10. I checked the 5v & GND, both fine. Checked the coil of TX & RX, resistence between both the point is around 400Khms & no shorts at all. Does this signal come directly from the SOC??? If someone can put in their expertises on this issue, I would appreciate. Thanks in advance.
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Last edited by mferna14; 09-20-2022, 02:23 PM. -
Re: Hp 15-cs2023ca USB 2.0 not working
do you mean USB3 ports? according to the spec, this unit has 1 USBC and 2 USBA ports. Is absolutely any of these working fine?Last edited by cruiser_; 09-20-2022, 03:17 PM. -
Re: Hp 15-cs2023ca USB 2.0 not working
Thanks for the reply. This has Only 2 USB ports & built-in USB 3.0 in it. I am only concerned about the Generic USB 2.0 which should work & now not working for some reason. More info pls. ask me. ThanksComment
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Re: Hp 15-cs2023ca USB 2.0 not working
Do you have a Chipmunk USB tester? If not, get one. Can save you buckets of time with USB port issues.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Remove all power. Meter in diode mode.
Red meter probe to ground.
Black meter probe to the D+ on the usb connector. What is the measurement?
Repeat with D- on the usb connector (black lead on meter). What is the measurement?
You may have local esd diodes that are damaged. Other faults may be an onboard usb hub controller that links to these ports. Check for the IC nearby.
Check the diode values against a known good USB port on any laptop.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
I'm going by this (external ports).
According to available G7BD schematics (not sure how close it resembles DAG7BMB58C0) the only elements between the ports and the PCH would be the ESDs or USB multiplexer. If you say your USB3 works fine then the multiplexer is out of the way iMHO.
See if USB power stays at steady 5V when you plug devices in.
Go for data lines with oscilloscope and see if they are sound/stable.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
I have seen these errors also on Dell laptops, after a reinstall of Windows 10, they didn't come backComment
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Re: Hp 15-cs2023ca USB 2.0 not working
I mentioned the meter reading for the Data lines, both are almost 400Khms, & the 5v is always present, the voltage is not fluctuating at all, stable as ever. I checked, but there does not seem to be any protection diode. After the coil, the circuit is directly going to the SOC, I am assuming this as I do not have the schematics for this model. I have a used another SSD with fresh Windows 10 on it & still gives "unknown usb device (device descriptor request failed)"Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
On newer mb's, there is no esd diode/controller . All bypassed by manufacturer to cut costs and hence any surge/malfunction in usb port directly affets the PCH part of SOC. Sad but true.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Actually that is a good thought to follow.
To rule out software issue try booting off a Linux usb and see if they work there.
I've seen win boxes having usb description read issue while trying to read usb2 devices in usb3 port.Last edited by cruiser_; 09-21-2022, 02:36 AM.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Also confirm the integrity of the 24mhz crystal onboard. This clock is linked to the usb controller engine.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Thanks, I will check both & report later..Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
You guys are so right "SMDFlea" & "mcplslg123", USBs, Webcam & SD Card reader solt even is not working. I have attached the photos of tHe USB board, kindly look into it. Hopefully we can resolve this problem. ThanksAttached FilesComment
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Re: Hp 15-cs2023ca USB 2.0 not working
USB+Webcam+Card Reader-not working is a sure indication of shorted SOC(USB part of PCH). So only SOC replacement will solve it. Else , dont waste your time.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Thanks mcplslg123 for the answer, I will do one last deep testing & then will order new motherboard.Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
3rd time...crystal ok ?Comment
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Re: Hp 15-cs2023ca USB 2.0 not working
Hey "mon2" read it now., I was so involved with the others.. Mon2 where is this crystal???/ Do you have a location for it? & how will I be able to test crystal??? Kindly inform me please. ThanksComment
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Re: Hp 15-cs2023ca USB 2.0 not working
Crystal can be tested with DSO. Should be located near to SOC.Comment
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