V290 don't start up. Backlight blinked every 2 second.

[Anton]

Hi,

I have a problem with Vision V290. It just stops working...

Now the screen is blank and backlight flickers weakly every 2s.

I have tried update firmware, but Visilogic can't connect.

Also, I have tested power supply: Current 0.093 A, internal DC-DC converter 5V also works well.

Please tell me how can I restore the PLC? Any help appreciated.

[Ausman]

Anton, this solution is unlikely, but have you ensured that the power supply plug (and all other plugs ) are actually fully inserted?  It is very easy to not push them in far enough.  And also, have you had it opened up, and possibly disturbed something?

cheers, AUs

[kratmel]

7 hours ago, Anton said:

screen is blank and backlight flickers weakly every 2s.

It is sound like Watchdog  try to restart system.

Maybe you must try to remove battery and check it.  If U<3V replace it. 

Try to restart, if not  - try to go to info mode.

 

[Anton]

On 3/6/2019 at 2:01 AM, Ausman said:

have you ensured that the power supply plug

Ausman, Yes, sure all plug inserted correctly. Also, I have check internal DC-DC 5V converter, it work well. PCB has been carefully checked - all contacts soldering well, no any damage.

 

On 3/6/2019 at 2:50 AM, kratmel said:

try to remove battery and check it.  If U<3V replace it. 

Kratmel, battery replaced to new 3.2V but PLC is still won't start up...

On 3/6/2019 at 2:50 AM, kratmel said:

try to go to info mode

Info mode is also not work

[Joe Tauser]

It sounds like your V290 has failed.  Do you have a spare?

Joe T.

[Anton]

4 hours ago, Joe Tauser said:

Do you have a spare?

Joe,  I have small smd components and can order IC. Also I have all tools and can replace any IC on PCB. I think that this fault not rare. 

Also this PLC is used not over 5 Hours and it like new. I don't think that flash memory can dead.

It looks like the unit have a problem with boot start.  Does it have some procedure for recover firmware?

[DanT]

Anton;

 

Does the V 290 have a snap on I/O Module?    Is it seated properly?

  and do you have the power also connected to it?    and to the V290     3 pin terminal

The 24 VDC Supply should be a regulated supply

Where is the DC-DC regulator?   On a  Snap On I/O Module?     The 5 V  regulator for the Main unit is  on the motherboard..

Hot old is the unit? 

 

[Ausman]

11 hours ago, Anton said:

Also I have all tools and can replace any IC on PCB. 

Anton, if your brand new car fails, do you immediately get out all your tools and replace the engine?  😀

Of course not, so why would you be trying to "repair" a brand new plc.  Sometimes things do have assembly failures and are DOA.  It sounds like you are into electronics, but in this case leave it alone and get a replacement under warranty.

cheers, Aus

 

[kratmel]

Maybe

https://support.unitronics.com/index.php?/selfhelp/view-article/i-updated-my-plc-v570v350-system-files-and-i-had-power-break-down-during-the-download-now-my-plc-has-a-black-screen-how-can-i-recover-the-plc

will be helpful.

[Joe Tauser]

On 3/7/2019 at 3:47 AM, Anton said:

Also this PLC is used not over 5 Hours and it like new. I don't think that flash memory can dead.

I am a distributor.  There is a two year warranty on Unitronics hardware.  I'd contact your supplier.

On 3/7/2019 at 3:47 AM, Anton said:

  I have small smd components and can order IC. Also I have all tools and can replace any IC on PCB. 

Schematics are not available anywhere, so this is a risky endeavor at best.

Joe T.

[Anton]

On 3/8/2019 at 2:16 AM, Ausman said:

get a replacement under warranty

Ausman, please don't worry, PLC is stop working 7 years ago and has been replaced to new other. But now it time for repair this PLC because the warranty is over.

 

On 3/8/2019 at 4:24 AM, kratmel said:

black-screen-how-can-i-recover-the-plc

Thank you Kratmel and all. This is helpful. 

The problem has been in a small soldering ball that shorted two pins in IC memory.  After removing this ball PLC can bootstrap and updated to new firmware successfully.