Richard,
I would suggest you re-check the soldering of the LCD pins. In fact, I
recommend that you solder them from both the top and bottom of the board.
Those pins do not protrude through the holes in the board. It is
possible to have solder covering the solder pads, but not in contact
with the pins.
Use a soldering temperature of 750 degF and watch for the solder to flow
out onto both the solder pad and the lead before removing the heat. A
good solder connection takes about 3 seconds. If it takes longer for
the solder to flow, the iron is not hot enough, OTOH if the solder flows
in 2 seconds or less, the iron is too hot.
73,
Don W3FPR
On 1/23/2015 2:43 PM, Richard Swanson wrote:
I am building a K1. On page 37, Alignment and test, Part 1, when I
turn on power I do not get the e27 display. The LED test was
correct. The LCD only shows a few vertical bars on the top half of
the display. If I tap a switch, the display goes blank. All
resistance and voltage checks up to this point are OK. I have gone
back over the construction steps and check soldering etc. Can't find
anything wrong. Any suggestions?
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