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K2 LCD Issue

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donh

K2 LCD Issue

Been happily on the air with my K2, but I noticed a few day ago that one of the segment of the LCD numeric display has stopped working. Not a bit deal since it's the last digit (.x0) in the frequency display.

But, I'm about to go into the radio and finally install the SSB module that I've had for a while and I thought while I was in there I would work on the LCD.

Only problem is that I have not idea on how to trouble shoot this problem.

Any suggestions?

Thanks

Don
W4DHH

Don Wilhelm-4

Re: K2 LCD Issue

Don,

That normally is the symptom of a solder connection that did not receive
adequate heat during soldering. After a time, enough oxidation has
developed to cause a problem.

If you are fortunate, that bad solder connection will be at the LCD.
Re-flow the solder for the LCD leads (I suggest soldering from the side
the LCD is mounted on), and see if that cures the problem. If it does
not, then the problem is with the soldering of Front Panel U1. Tell me
which segment is not working and I can tell you which U1 pin that needs
to be soldered better. Since the pins of FP U1 are covered by the LCD,
the technique for resoldering is to carve away a bit of the plastic from
the U1 socket and soldering the pin from the socket side of the board.

73,
Don W3FPR

On 2/24/2014 6:46 PM, donh wrote:

> Been happily on the air with my K2, but I noticed a few day ago that one of
> the segment of the LCD numeric display has stopped working. Not a bit deal
> since it's the last digit (.x0) in the frequency display.
>
> But, I'm about to go into the radio and finally install the SSB module that
> I've had for a while and I thought while I was in there I would work on the
> LCD.
>
> Only problem is that I have not idea on how to trouble shoot this problem.
>
>

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luc Favre-2

Re: K2 LCD Issue

I had the same issue and resoldering the LCD did the job.
73
Luc/F6HJO

Le 25/02/2014 01:02, Don Wilhelm a écrit :

> Don,
>
> That normally is the symptom of a solder connection that did not
> receive adequate heat during soldering. After a time, enough
> oxidation has developed to cause a problem.
>
> If you are fortunate, that bad solder connection will be at the LCD.
> Re-flow the solder for the LCD leads (I suggest soldering from the
> side the LCD is mounted on), and see if that cures the problem. If it
> does not, then the problem is with the soldering of Front Panel U1.
> Tell me which segment is not working and I can tell you which U1 pin
> that needs to be soldered better. Since the pins of FP U1 are covered
> by the LCD, the technique for resoldering is to carve away a bit of
> the plastic from the U1 socket and soldering the pin from the socket
> side of the board.
>
> 73,
> Don W3FPR
>
> On 2/24/2014 6:46 PM, donh wrote:
>> Been happily on the air with my K2, but I noticed a few day ago that
>> one of
>> the segment of the LCD numeric display has stopped working. Not a
>> bit deal
>> since it's the last digit (.x0) in the frequency display.
>>
>> But, I'm about to go into the radio and finally install the SSB
>> module that
>> I've had for a while and I thought while I was in there I would work
>> on the
>> LCD.
>>
>> Only problem is that I have not idea on how to trouble shoot this
>> problem.
>>
>>
>
> ______________________________________________________________
> 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
>