Oscar, If you want to troubleshoot it, look at the schematic and follow the path for the voltages applied to D2 and D3 with your DMM, you can approximate 1.5 to 2 volts drop through each LED if it is conducting.
The most likely thing is that you have failed to solder a connection, check R9, R10, R11, Q1 and Q2. Be certain Q1 and Q2 are oriented properly, and be certain U3 pin 17 has been soldered. 73, Don W3FPR > -----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 > _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
