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Hello, I've built the 30m version QCX kit. LCD is completely blank and the Si5351A chip does not generate any signal at all. The main ATMEGA328 Chip works fine (tested it by seating it in another qcx transceiver). Replugging the LCD gives a blank row on top, suggesting that the MCU 'talks' with LCD. Any help would be appreciated!

Maybe a connection problem leading to the lcd. Check and reflow solder joints. Also check inductors there to insure they aren't open.

Curt

Hi

1. Have you adjusted the brightness control?
2. Does the display that works on the other QCX work on yours?
3. Have you fitted the mods on.....



Mike
G0CVZ

Ok, after a series of catastrophic events, I think that Figure out what's wrong. Here is what I discovered:
If Atmega328p Can't communicate with Si5351A, it displays a blank screen. I think so because:

• When I let the magic smoke out of my good Si5351A chip on my working QCX (not anymore), it developed the same problem.
• When I put a fresh chip (YOTA firmware) in the new QCX, it asked me to select the band I chose, it displayed a blank screen after the setup.

Would've been nice if instead of displaying a blank screen it would've displayed an error message.

Simas, the top row of blank boxes is, I think, indication the uP is NOT talking? to? the LCD. There is a lot of discussion? by the group on how to handle this problem.
--
Wes

AE6ZM

Hereford, AZ

?

No, when I power up my QCX, the LCD goes completely blank, BUT ONLY IF its taken out and put back again (while the QCX is powered up) it starts to display top row of blank boxes