INSKAM Microscope USB port issue

[lcdcaps1]

Hi
All
Does anyone have a INSKAM 7 inch LCD digital microscope
I have a weird issue on the one I have where the USB port does not output enough power because when I connect a USB light or the ring light the light output is always really dim
The ring light when connected to the microscope USB port is at the lowest brightness and turning the brightness knob makes no difference
I have tried different cables and different USB power adapters

I have confirmed there is nothing wrong with the ring light and the other USB light by plugging them into another USB source other than the microscope and they work fine and ring light brightness works

Has anyone had any issues with this before
Does anyone have any schematics or board view or photos of the board

Thanks all

[stj]

most usb microscopes you dashcam type circuits, it probably has a usb supervisor chip on the 5v rail that limits current.

[lcdcaps1]

most usb microscopes you dashcam type circuits, it probably has a usb supervisor chip on the 5v rail that limits current.

Thanks for the reply
I'll try and get into it and look

[lcdcaps1]

I have just noticed my photos of the microscope. Did not attach. I have attached again.
I am trying to get inside to have a look but after removing the screws it is still tight

Has anyone got the same or similar microscope, please. The inside boards are most likely the same or similar throughout the diffirent models
Thanks all

[lcdcaps1]

I plugged in a USB amp meter into the USB port and got nothing showing
I tried a few and tested on other devices
I found this very strange

It is as though the USB port is shorted or loose
I do not understand why there is no voltage showing because there must be some voltage output as the LED ring light is being lit up
Still trying to see how to get into it
Removed the screws but still very tight

[lcdcaps1]

I plugged in a USB amp meter into the USB port and got nothing showing
I tried a few and tested on other devices
I found this very strange

It is as though the USB port is shorted or loose
I do not understand why there is no voltage showing because there must be some voltage output as the LED ring light is being lit up
Still trying to see how to get into it
Removed the screws but still very tight

What could cause the USB Ammeter show this behaviour
Has anyone seen this issue before