My grandson and I are still stuck on
step 1 "LCD contrast adjustment".? We are following the current Trouble
Shooting page under "Digital Section¡± and are getting the results as listed
under"LCD all Blocks or all Blanks".? R47 has the full 5 volt range, but
adjustment moves from all blocks to all blanks and never any alpha or numeric
characters on the display.
?
We made all the measurements on
pages 125 and 126 of the manual-including the SI 5351and have attached these for
your perusal.?I have an unbuilt rev 3
30 meter kit.? I swapped both the LCD and microcontroller from it to the 40
meter kit under test and the results are the same (adjusting the display moves
from all blocks to all blanks and never any alpha or numeric characters)
?
Using the scope I checked for clock
and oscillator signals at appropriate points and none are seen. I suspect a
failed SI 5351 and plan to replace it to prove my theory.
?
?I have worked with SMT using both
solder/wick and hot air gun, but never this smaller size.? Any one have a recommendation on how
best to remove and install this grain of sand?? Also, look over my measurements and see
if you see something else that may be responsible for this
failure.
?
Despite this bump in the road, my
grandson remains enthusiastic.? Any
suggestions welcomed and appreciated.
