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Check QRP Labs' website in the QCX section for Hans' QCX Troubleshooting Guide pdf. If your 40m board is Rev 3 then there are a couple of mods you should do, especially move the inductor, I think is L1...but please check! Thanks!

--Al
WD4AH

On 18/07/18 18:01, Ken Evans wrote:

We are following the
current Trouble Shooting page under "Digital Section"

Good, also search the groups.io email archives for "LCD".

and are getting the
resutts 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.

One row of blocks or two ?

One row means the LCD is probably OK.
Two rows means the LCD has a fault, check all LCD connections, swap.

We made all the measurements on pages 125 and 126 of the manual-and have
attached these for you perusal.

I don't open document files from unconfirmed sources.
Notepad TXT file would have been acceptable (no embeddable objects).

Am suspecting something amiss with either
the SI5351A or the microcontroller.

One row of blocks can be an indication the microcontroller is failing to
communicate with the LCD.

You do not state which version *this* is, does it require the
microcontroller start-up modification ?

I have an unbuilt rev 3 30 meter kit.> Can i try the microtrolleer from it to see if that resolves our problem?

Yes, after checking for other faults first.

I
have equipment to work with sm- but no experience at this level. so could
try an SI swap as well.

Unlikely the SI would affect the LCD or microcontroller unless it is
causing a short, which you could detect with a DVM.

Open for suggestions.

Ken
W4DU

On my first build when I first powered up I had a completely blank screen.? I had to examine all of my solder work and I discovered a few bridges/shorts/cold joints, whatever you want to call them.? Once I cleaned them up and powered up it worked fine.? I'd suggest just looking at it again using a magnifier to make sure.? Good luck!
--

73, Reid K8JLW

If you have a counter, ?check the two outputs on the SI. There are pins of the board for these outputs.

That ?test will make troubleshooting easier
--
73, Bernie, VE3FWF