Re: Horizontal lines after power up
toggle quoted messageShow quoted text
Horizontal lines would seem to indicate that one of the data (DB) leads
is not making a good connection. If you can turn the contrast down so
you can see individual bit positions on a vertical line of dots you may
be able to see which bit is not failing. From this you could discern
which lead (DB-0 thru DB-7) is not working. That would tell you which
wire to check.
This all assumes that you are using either a 2-line or 4-line LCD display.
If using some other display then it might take more detective work to
find the missing bit(s).
On Mon, Jul 6, 2020 at 9:50 PM Jim Netwal <w9uum732u@...> wrote:
I'm thinking now that I may have a bad display. I've checked all connections and and reheated all solder joints to the display and micro controller. I have a QCX 40 as well so I put the "bad" display in it and same lines on that radio. I haven't tried the "good" screen on the QCX 20 yet in case I caused the problem. Also adjusting R47 voltage 0 - 5 volts is good.