244Re: LCD does not display anything
- Sep 17, 2011Thanks Jim.
The chap I bought it from did say it was built except for the pods but I think he forgot to solder the front side of the LCD header. Just above the LCD, it was simply NOT soldered. Unless the PIC went bad, I don't see how it could have ever worked.
I did take the front panel partially apart enough to solder the header. I have voltage where I am supposed to but still no display. I also do not have any CW being sent even though the relays are clicking upon startup. It does appear to program just fine. Have you ever seen a similar issue if there was an issue with the PIC?
Short of that, I will have to disassemble the whole front and recheck every single solder joint. So, the cautionary tale of not knowing how it was put together before you. :)
--- In firstname.lastname@example.org, "Jim Garland" <4cx250b@...> wrote:
> Tom, Your symptoms suggest a bad solder connection. If the LED for TX2
> blinks as you push on the LCD, then that almost surely is an intermittent
> connection to the +5V supply. The relevant +5V traces on the front panel PCB
> go from pins 24-25 of P307, over to C310, and then to pins 3,4, and 14 of
> U301. Also, the +5V feed to the LCD goes through R316 (a 10 ohm resistor)
> to pin 15 of the LCD header J305. I suggest you check all those solder
> joints, as well as all the joints on the LCD header (both ends). Since
> pushing on the display causes an intermittent problem, I'd guess there's an
> unsoldered connection somewhere, or a cold solder joint. Let me know what
> you find.
> Jim W8ZR
> From: email@example.com [mailto:firstname.lastname@example.org] On
> Behalf Of thomasmschaefer
> Sent: Saturday, September 17, 2011 10:46 AM
> To: email@example.com
> Subject: [stationpro] Re: LCD does not display anything
> The plot thickens. I noticed if I press on the left side of the LCD, it gets
> quite a bit brighter. Also, the LED for TX 2 blinks in concert when I push
> the LCD> There seems to be quite a bit of give on the left side of the
> circuit board. Is there supposed to be something that supports the corner by
> the display to the front of the panel. I do not see anything obvious that is
> missing. I am guessing a bad connection (perhaps from shipping). When it lit
> up, I then tried the contrast adjustment, but that makes no difference.
> Tom NY4I
> --- In firstname.lastname@example.org <mailto:stationpro%40yahoogroups.com> ,
> "thomasmschaefer" <ny4i@> wrote:
> > Hi all, I finally got around to testing out the almost assembled SPII
> (only pods remain to be done. When I powered the unit on and program it, I
> see download is successful. If I push an amplifier select, the relay flips.
> I hear staging of relays a few seconds after powerup. I checked the voltage
> at TP204 and it is 5.01 volts. I also adjusted the contrast with R301. Short
> of pulling it all apart looking for solder bridges, anyone have any ideas.
> Note that the LCD is lit, just no text.
> > Thanks,
> > Tom NY4I
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