It is likely a shorted C102.   Please see:

http://elecraft.365791.n2.nabble.com/K3S-LCD-backlight-is-on-but-no-segments-are-lit-td7633025.html

I humbly suggest an ECO to change that to a 16V cap.

73 de AI6KG
-- Christopher.



On Sat, Apr 14, 2018 at 4:29 AM, Jim Spears <n...@cox.net> wrote:

> I have a recently assembled very basic K3S which suddenly developed,
> overnight, an issue with the display.  I turned it on this morning and the
> display was completely blank, fully lit as in not dark.  It stayed blank
> for
> a bit so I turned it off.  When I turned it back on, some pixels were dark
> but it was mostly blank.  I cycled power again and it came back to normal
> state.
>
>
>
> This is of course, Saturday, and home base is not available.  Has anyone
> seen this before and can point me to something I can do while waiting for
> home base to open Monday.
>
>
>
> The radio has the following options:  K3EXREF, K144XV and the module tying
> the K144XV to the K3EXREF controlled synthesizer.
>
>
>
> A second problem has also surfaced, the blinking asterisk indicating that a
> suitable signal from the external 10 MHz source is not making it into the
> system.  The 10 MHz source is OK as it works fine with another K3.  There
> must be a connection problem inside the radio.  Unless there is something I
> need to do to enable it that I missed.
>
>
>
> Again, this is a 10 watt K3S.
>
>
>
> Jim/N1NK
>
>
>
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