[Elecraft] No Backlight K2 - Fixed

[Oscar F Hills]

Thanks very much to Don W3FPR and Jim W4ATK who pointed me on the  
right path, and now all is well with the backlight. A few minutes  
with my DMM isolated a cold joint on pin 17 of U3. It looked okay to  
the eye, but I guess it was the result of trying to solder quickly  
with minimum solder to protect U3!  Thanks again, guys! And, I  
learned a little more about schematics and troubleshooting too. I  
really appreciate it.
73,
Oscar WV1C


>> -----Original Message-----
>>
>> Well, thanks to great forbearance on my wife's part over this little
>> holiday vacation, K2 #5630 is coming right along. I finished up Part
>> 1, and all the tests are just fine _except_ that I have no backlight.
>> The LCD reads fine, but there's no change in it or in the LED
>> brightness when I switch between night and day. I haven't tied it in
>> a darkened room, but I am assuming I should be able to tell whether
>> the backlight is on even in normal room light.
>>
>> At first I had the terrible fear that I should have taken the white
>> film off the diffuser, but an archive search told me I was right to
>> leave it there. But now I don't know why I don't have the back light.
>>
>> Any advice on the most efficient way to troubleshoot this?
>>
>> Thanks!
>>
>> Oscar WV1C
>>
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