USB Hub Not Working

Received USB HUB stating problem was not detecting any USB device.

Connected the unit on my PC for testing & found it is not detecting any USB pendrive but when we connect mobile it starts charging, indicates power from the device is OK but data path is not working.

So opened the unit for inspection.

First checked USB cable continuity end to end. Found OK,

 device looks dusty hence cleaned it properly.

Checked Resistors & capacitors, all seems ok. Resistor used in this device by Marking on the PCB, R1=681 / 680Ω, R2=103/10KΩ, R3=473/47KΩ & R4=104 /100KΩ. Checked PCB for dry solder but everything looks OK still I retouched USB ports. Because this unit used Double layer PCB. This unit controlled by GL850G USB 2.0 Hub Controller IC.

When cleaning with the brush I Found one resistor marked R3=473/47K is fell down, maybe it has poor solder contacts.

Re soldered the resistor on its place.

While handling multilayer PCB be careful for traces, it gets ripped-off or burnt-out on overheat of soldering Iron.

again cleaned everything using IPA, re assembled everything & connected the unit on my PC for testing & found PC Detect my HP USB Pendrive.

Now unit is ready for pickup.

This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.

P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.

Note: You can check his previous repair articles on CIRCA BP Monitoring Machine Error 3

This site uses Akismet to reduce spam. Learn how your comment data is processed.