K2 LCD Screen Issue

[Mark Yergin]

My K2 (S/N 7867) which I built has always had an intermittent problem with
the bottom horizontal row of LCD elements.  Often they are missing until I
slap the top of the radio.  Then they will come back on for a while.  I'd
like a more permanent solution.  Looking for some ideas as to where to
focus my investigation.  Do I have a short between the front panel and
control board?  A loose connection somewhere?  Was thinking maybe this has
been seen before and someone else's solution could help point me in the
right direction.  I'd like to try to fix it myself before I send it out for
repair.  Thanks.

Mark
W8EWH
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[Don Wilhelm]

Mark,

I think you will find that the socket pins of Front Panel U1 are not
well soldered.

73,
Don W3FPR

On 2/7/2021 1:18 PM, Mark Yergin wrote:
> My K2 (S/N 7867) which I built has always had an intermittent problem with
> the bottom horizontal row of LCD elements.  Often they are missing until I
> slap the top of the radio.  Then they will come back on for a while.  I'd
> like a more permanent solution.  Looking for some ideas as to where to
> focus my investigation.  Do I have a short between the front panel and
> control board?  A loose connection somewhere?  Was thinking maybe this has
> been seen before and someone else's solution could help point me in the
> right direction.  I'd like to try to fix it myself before I send it out for
> repair.  Thanks.
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[Mark Yergin]

Thanks Don and Joel, who both suggested bad solder joints.  I touched up
all the LCD and U1 solder joints on the Front Panel and the problem was
resolved!

Mark
W8EWH

On Sun, Feb 7, 2021 at 1:49 PM Don Wilhelm <[hidden email]> wrote:

> Mark,
>
> I think you will find that the socket pins of Front Panel U1 are not
> well soldered.
>
> 73,
> Don W3FPR
>
> On 2/7/2021 1:18 PM, Mark Yergin wrote:
> > My K2 (S/N 7867) which I built has always had an intermittent problem
> with
> > the bottom horizontal row of LCD elements.  Often they are missing until
> I
> > slap the top of the radio.  Then they will come back on for a while.  I'd
> > like a more permanent solution.  Looking for some ideas as to where to
> > focus my investigation.  Do I have a short between the front panel and
> > control board?  A loose connection somewhere?  Was thinking maybe this
> has
> > been seen before and someone else's solution could help point me in the
> > right direction.  I'd like to try to fix it myself before I send it out
> for
> > repair.  Thanks.
>

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[Frank Krozel]

A very cool QRZ page there Mark!

-73-  Frank    KG9H
[hidden email]

> On Feb 7, 2021, at 1:28 PM, Mark Yergin <[hidden email]> wrote:
>
> Thanks Don and Joel, who both suggested bad solder joints.  I touched up
> all the LCD and U1 solder joints on the Front Panel and the problem was
> resolved!
>
> Mark
> W8EWH
>
> On Sun, Feb 7, 2021 at 1:49 PM Don Wilhelm <[hidden email]> wrote:
>
>> Mark,
>>
>> I think you will find that the socket pins of Front Panel U1 are not
>> well soldered.
>>
>> 73,
>> Don W3FPR
>>
>> On 2/7/2021 1:18 PM, Mark Yergin wrote:
>>> My K2 (S/N 7867) which I built has always had an intermittent problem
>> with
>>> the bottom horizontal row of LCD elements.  Often they are missing until
>> I
>>> slap the top of the radio.  Then they will come back on for a while.  I'd
>>> like a more permanent solution.  Looking for some ideas as to where to
>>> focus my investigation.  Do I have a short between the front panel and
>>> control board?  A loose connection somewhere?  Was thinking maybe this
>> has
>>> been seen before and someone else's solution could help point me in the
>>> right direction.  I'd like to try to fix it myself before I send it out
>> for
>>> repair.  Thanks.
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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