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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