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Just opened the box and charged the unit now all I get is a white screen!!!!!
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Check that the Boot contacts aren't shorted . . .
On Mon, Dec 7, 2020 at 7:24 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: Should have said that this my third one for a Christmas gift. What I am |
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Mel,
That is exactly what happens if one shorts the boot contacts next to the battery connector when switching on. Therefore, check that the boot contacts are not shorted. Stefan. On Mon, Dec 7, 2020 at 9:11 PM stefan baartman via groups.io <seb21051= [email protected]> wrote: Check that the Boot contacts aren't shorted . . . |
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Mel Farrer
Where is this on the PCB?? There are a string of feed throughs that are way to small a print for me.
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Mel, K6KBE On Monday, December 7, 2020, 07:28:43 PM PST, stefan baartman <seb21051@...> wrote:
Mel, That is exactly what happens if one shorts the boot contacts next to the battery connector when switching on. Therefore, check that the boot contacts are not shorted. Stefan. On Mon, Dec 7, 2020 at 9:11 PM stefan baartman via groups.io <seb21051= [email protected]> wrote: Check that the Boot contacts aren't shorted . . . |
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Hi All,
I have gotten this to occur when one of these two thing occurs: o I turn on the NanoVNA with an antenna attached to the CH0 connector. o The battery charge is low. This may be conquencidental . Attaching the USB-C to the laptop or charger seems to resolves the issue for me. I do not know if this is normal or not. I do not recall this happening when it was new. 73, John VA3BOF |
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Mel Farrer
Thanks John, But the unit was fully charged and nothing connected???? So the real question is still how to do a hard reset.
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Mel, K6KBE On Tuesday, December 8, 2020, 10:38:10 AM PST, John Chin <va3bof@...> wrote:
Hi All, I have gotten this to occur when one of these two thing occurs: ? ? o I turn on the NanoVNA with an antenna attached to the CH0 connector. ? ? o The battery charge is low. This may be conquencidental .? Attaching the USB-C to the laptop or charger seems to resolves the issue for me. I do not know if this is normal or not.? I do not recall this happening when it was new. 73, John VA3BOF |
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Hi Mel, the connections in question can be identified as follows:
1. Once the unit is opened up, turn it over so the screen is down, with the controls at the top. 2. On the left side you see a row of connections. 3. The top and second connections are the ones which when connected to a pushbutton switch, allows one to push the switch while turning on and thus get the white screen. 4. It occurred to me that could be where a short would cause that symptom. 5. If you don't measure a short across those to connections, the problem very likely lies elsewhere. Hope this helps. Stefan. On Tue, Dec 8, 2020 at 12:16 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: I took the unit under my microscope and did not see any bridges from VC to |
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Mel Farrer
Yes Stefan,
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No connection other than the 10 K from BOOT to ground.? I went out and put a short to ground on the BOOT and switched it on, NADA,? Something else. Mel, K6KBE On Tuesday, December 8, 2020, 01:40:54 PM PST, stefan baartman <seb21051@...> wrote:
Hi Mel, the connections in question can be identified as follows: 1. Once the unit is opened up, turn it over so the screen is down, with the controls at the top. 2. On the left side you see a row of connections. 3. The top and second connections are the ones which when connected to a pushbutton switch, allows one to push the switch while turning on and thus get the white screen. 4. It occurred to me that could be where a short would cause that symptom. 5. If you don't measure a short across those to connections, the problem very likely lies elsewhere. Hope this helps. Stefan. On Tue, Dec 8, 2020 at 12:16 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: I took the unit under my microscope and did not see any bridges from VC to |
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Mel,
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If you turn on your Nanovna and connect it to a Windows PC, do you hear the usual tones to know that the PC recognised a usb device? When you turn your Nanovna on, do you see one LED flashing? Have you tried running it when plugged in to your PC? ... Larry On Tue, 8 Dec 2020 at 4:48 PM, Mel Farrer via groups.io<farrerfolks@...> wrote: Yes Stefan, No connection other than the 10 K from BOOT to ground.? I went out and put a short to ground on the BOOT and switched it on, NADA,? Something else. Mel, K6KBE On Tuesday, December 8, 2020, 01:40:54 PM PST, stefan baartman <seb21051@...> wrote:
Hi Mel, the connections in question can be identified as follows: 1. Once the unit is opened up, turn it over so the screen is down, with the controls at the top. 2. On the left side you see a row of connections. 3. The top and second connections are the ones which when connected to a pushbutton switch, allows one to push the switch while turning on and thus get the white screen. 4. It occurred to me that could be where a short would cause that symptom. 5. If you don't measure a short across those to connections, the problem very likely lies elsewhere. Hope this helps. Stefan. On Tue, Dec 8, 2020 at 12:16 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: I took the unit under my microscope and did not see any bridges from VC to |
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Also, was the unit exposed to any vigorous vibration or temperature changes? You might have a cracked solder joint where the LCD flex ribbon connects to the PCB under the display. A few other forum members have experienced this issue in the past month or so.
To answer your very 1st question...there is no hard reset. You can power cycle the device or reflash it's firmware and do a clearconfig 1234 That is essentially a hard reset. Good luck! |
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Mel Farrer
Not plugged it into the PC yet will try that, Thanks.
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Mel, K6KBE On Tuesday, December 8, 2020, 03:24:52 PM PST, Larry Rothman <nlroth@...> wrote:
Mel, If you turn on your Nanovna and connect it to a Windows PC, do you hear the usual tones to know that the PC recognised a usb device? When you turn your Nanovna on, do you see one LED flashing? Have you tried running it when plugged in to your PC? ... Larry ? On Tue, 8 Dec 2020 at 4:48 PM, Mel Farrer via groups.io<farrerfolks@...> wrote:? Yes Stefan, No connection other than the 10 K from BOOT to ground.? I went out and put a short to ground on the BOOT and switched it on, NADA,? Something else. Mel, K6KBE ? ? On Tuesday, December 8, 2020, 01:40:54 PM PST, stefan baartman <seb21051@...> wrote: Hi Mel, the connections in question can be identified as follows: 1. Once the unit is opened up, turn it over so the screen is down, with the controls at the top. 2. On the left side you see a row of connections. 3. The top and second connections are the ones which when connected to a pushbutton switch, allows one to push the switch while turning on and thus get the white screen. 4. It occurred to me that could be where a short would cause that symptom. 5. If you don't measure a short across those to connections, the problem very likely lies elsewhere. Hope this helps. Stefan. On Tue, Dec 8, 2020 at 12:16 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: I took the unit under my microscope and did not see any bridges from VC to |
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Mel Farrer
I will take the unit apart and check the cable.? The last only works when the screen comes up!
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Mel, K6KBE On Tuesday, December 8, 2020, 03:31:45 PM PST, Larry Rothman <nlroth@...> wrote:
Also, was the unit exposed to any vigorous vibration or temperature changes? You might have a cracked solder joint where the LCD flex ribbon connects to the PCB under the display. A few other forum members have experienced this issue in the past month or so. To answer your very 1st question...there is no hard reset. You can power cycle the device or reflash it's firmware and do a clearconfig 1234 That is essentially a hard reset. Good luck! |
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Actually, even if the screen is non-functional, I think you can still runn the unit headless through the usb port and using NanoSaver or OneofEleven's great application, NanoApp.?
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On Tue, 8 Dec 2020 at 7:23 PM, Mel Farrer via groups.io<farrerfolks@...> wrote: I will take the unit apart and check the cable.? The last only works when the screen comes up! Mel, K6KBE On Tuesday, December 8, 2020, 03:31:45 PM PST, Larry Rothman <nlroth@...> wrote:
Also, was the unit exposed to any vigorous vibration or temperature changes? You might have a cracked solder joint where the LCD flex ribbon connects to the PCB under the display. A few other forum members have experienced this issue in the past month or so. To answer your very 1st question...there is no hard reset. You can power cycle the device or reflash it's firmware and do a clearconfig 1234 That is essentially a hard reset. Good luck! |
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Shorting the BOOT to VDD and turning it on, then removing the short, puts the VNA in DFU mode. when in DFU mode the screen is suppose to be white.
you might try connecting the VNA to your computer, run the DFU programming program, load the latest firmware, When done, turn the VNA off then back on. see if it boots correctly. if not the VNA seems to be stuck in DFU mode or you have a bad solder joint or bad solder joint in the display circuit. There has been a few reports of bad solder connections where the cable from the display and PC board. Clyde KC7BJE |
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NOTE: the DFU mode screen is only white for the older, original nanovna's including the H.
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The H4 DFU screen is dark. On Wednesday, December 9, 2020, 3:34:34 p.m. EST, Clyde Lambert <clyde.lambert@...> wrote:
Shorting the BOOT to VDD and turning it on, then removing the short, puts the VNA in DFU mode. when in DFU mode the screen is suppose to be white. you might try connecting the VNA to your computer, run the DFU programming program, load the latest firmware, When done, turn the VNA off then back on. see if it boots correctly. if not the VNA seems to be stuck in DFU mode or you have a bad solder joint or bad solder joint in the display circuit. There has been a few reports of bad solder connections where the cable from the display and PC board. Clyde KC7BJE |
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Mel Farrer
Thanks Clyde, will try that where to find DFU program???
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Mel, K6KBE On Wednesday, December 9, 2020, 12:34:34 PM PST, Clyde Lambert <clyde.lambert@...> wrote:
Shorting the BOOT to VDD and turning it on, then removing the short, puts the VNA in DFU mode. when in DFU mode the screen is suppose to be white. you might try connecting the VNA to your computer, run the DFU programming program, load the latest firmware, When done, turn the VNA off then back on. see if it boots correctly. if not the VNA seems to be stuck in DFU mode or you have a bad solder joint or bad solder joint in the display circuit. There has been a few reports of bad solder connections where the cable from the display and PC board. Clyde KC7BJE |
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Mel Farrer
Thanks, need to find the SW.
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Mel, K6KBE On Wednesday, December 9, 2020, 12:55:14 PM PST, Larry Rothman <nlroth@...> wrote:
NOTE: the DFU mode screen is only white for the older, original nanovna's including the H. The H4 DFU screen is dark. ? ? On Wednesday, December 9, 2020, 3:34:34 p.m. EST, Clyde Lambert <clyde.lambert@...> wrote:? Shorting the BOOT to VDD and turning it on, then removing the short, puts the VNA in DFU mode. when in DFU mode the screen is suppose to be white. you might try connecting the VNA to your computer, run the DFU programming program, load the latest firmware, When done, turn the VNA off then back on. see if it boots correctly. if not the VNA seems to be stuck in DFU mode or you have a bad solder joint or bad solder joint in the display circuit. There has been a few reports of bad solder connections where the cable from the display and PC board. Clyde KC7BJE |
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73, Zack W9SZ On Wed, Dec 9, 2020 at 3:33 PM Mel Farrer via groups.io <farrerfolks= [email protected]> wrote: Thanks, need to find the SW. |
Clyde Lambert
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