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Checked the rocker switch, it is working correctly. I came across a thread here: /g/nanovna-users/topic/nanovna_does_not_want_to/32846852 where they had an issue with a ip5303 or

I believe that your problem is a bad battery that won't take a charge, therefore, it wont start either! V. Kaufman

I have a smaller one that the screen was damaged so maybe I will have spare parts. I’m I did check the resistors the other day and showed good. I will see it I can find that schematic so figure out

On 2/17/22 3:41 PM, Jim Lux wrote: > On 2/17/22 12:57 PM, Larry Rothman wrote: >> ? Alan, >> The schematics are in the Wiki. >> There are only resistors in the input pad. You need to measure them to

On 2/17/22 12:57 PM, Larry Rothman wrote: > Alan, > The schematics are in the Wiki. > There are only resistors in the input pad. You need to measure them to see which is fried. Hopefully, you didn't

As previously described, (see attached schematic ) there's a resistive pad (E2, R22,R23,R24, R25) then the SA612AD ( E4, U8.) I doubt it would blow up anything else that's connected (that is, the

Check the rocket switch with an ohmmeter to verify all 3 switches are normally open. On Thu., 17 Feb. 2022 at 4:32 p.m., Brady Nelson<tbradynelson@...> wrote: I did have some trouble with the

I posted the schematics in the other post you made on this subject.. Roger

I did have some trouble with the button when it was working, but I keep messing with the button to see if I can get it to start, no luck.

I blew my vna after connection to a cheap digital attenuator, current surge blew out front end. Use only passive fixed attenuators now. [email protected]> wrote:

Alan, The schematics are in the Wiki. There are only resistors in the input pad. You need to measure them to see which is fried. Hopefully, you didn't fry the SA612 input. If you have 2 soldering

So S21 has been damaged when I was checking a LNA, i gapped it for 2 seconds and hooked the attenuator on the wrong side. It is a H4, I was going to order a new one as needed pass through on most

I'm not sure a USB cable would make a difference if the feedline is properly "isolated" from the environment. (i.e. the USB cable isn't coiled up with the transmission line). I can't think of a

Sorry - that should be 3v at each of the points, not between. Now, with that said, I just had weirdness with my Nano-H - it wouldn't boot. It turned out the Enter button (I installed buttons on mine)

I measured it while unplugged from USB, I get 3.4V between VDD and Ground but no voltage between VDD and the capacitor in the picture.

The only thing at this point is to measure the VDD out of the 3v regulator to make sure it's working. Schematics are in the Wiki.I've attached an early H4 PCB image for you.

Your battery is defective - get a new one or have a look at some of my early posts where I used a cellphone battery. /g/nanovna-users/attachment/223/0/Battery-PCB-MiscShields.jpg

my nano vna Hugen v4 shows full battery but after about 10 seconds turn off.... connected to USB port works fine wrote:

Sorry should have been clearer, it doesn't turn on even with the battery disconnected.

Correct - that is controlled by the charging/inverter chip. Can you turn your Nano turn on when connected to USB and the battery is disconnected?