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Just a long shot, have you adjusted for contrast?
From: Andrea Massucco IZ1IVA <ml@...>
Sent: Sun, Jun 20, 2021 11:35 am
Subject: [QRPLabs] QCX: top row blocks on display, but CPU responds to ISP #avr #display #troubleshooting
I've given another look at my faulty QCX (see https://groups.io/g/QRPLabs/message/42064 ), which all of a sudden stopped booting up. I've had success hooking it up to a PC via an AVR programmer: the CPU responds and I was even able to upgrade the firmware from 1.03 to 1.07a!
Alas, the QCX still displays a row blocks on its display, so I'm again stuck...
73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net