What could cause the USB Ammeter show this behaviour
Has anyone seen this issue before...
lcdcaps1
Badcaps Veteran
Last Activity: Today, 03:20 PM
Joined: 10-20-2011
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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...Leave a comment:
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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...Leave a comment:
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Thanks for the reply
I'll try and get into it and look...Leave a comment:
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INSKAM Microscope USB port issue
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... -
I have seen board views on *************
Not putting link as not sure what the rules are
Can anyone download for me
Thanks...Leave a comment:
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Thanks. Do you have a board view please
Thanks again...Leave a comment:
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Hi
AllLeave a comment:
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Compaq La-1701 Rev 2.0 schematic board view
Hi
All
Does anyone have a board view for
LA-1701 REV 2.0 HP Compaq nx700, schematic and board view
Thanks so muchLast edited by lcdcaps1; 05-25-2024, 06:34 AM. -
Thanks for the reply
I can replqce with a 5v1 zener diode smd which is 0.5 w
or 5v1 zener diode 1w which is through hole
I'm thinking if I replace with the 1w zenner diode it will add a bit more protection
any thoughts please
Thanks...Leave a comment:
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Would it be better to replace it with a 5v1 diode or a 5v6 diode, please
i think the glass might be cracked...Leave a comment:
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I am thinking that should i replace with a new better zenner diode as I am replacing the chipLeave a comment:
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In the process of doing it...Leave a comment:
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You were right
I got 1.6 ohms across the motor terminals and
i got 1.7 ohms across the diode both ways
i got 0.002 v drop both ways...Leave a comment:
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Is there any way to know if the Zenner diode is ok without removing it...Leave a comment:
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Can I use
1N4734A
5v6 1w
instead of smdLeave a comment:
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Thanks for the reply
I will do that
does that mean the Zener diode would still be ok
After speaking to the person who gave this to me, to look at
They said they plugged in another cable that had the same connector but the power adapter was different
was not usb
I believe that this is why the TP4056 blew
I I replace the TP4056 and deal with the burn damage
will it work again or should I replace the zener diode as well with a higher one
Thanks...Leave a comment:
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Yes I tested the diode it was a showing low ohms reading both ways...Leave a comment:
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Thanks for the reply
When you say a 1w diode
is that still a 5v1...Leave a comment:
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Usb rechargeable hair clippers blown tp4056 and zener diode
Hi
all
I have a usb rechargeable hair trimmers that should work plugged in and charge
it stopped working no led norhing
I've opened it up and see the tp4056 chip has blown
There is a zener diode that I tested and get a near short ohms reading no matter which way my leads are
I don't know what to replace this with
Please help
thanks so much...
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