Yup, the same here. Fireworks were great. Opened the can, replaced 74HC125D to 74F125D - just to realize that the signal generator is not responsible for the picture on the screen. Started going with my multimeter from the USB jack down the power lines, found that one of the voltage regulators (U2) gives out half a volt. Took it out, it was OK. Definitely it is the MCU that went dead and. SO I took it out either - USB suddenly announced that there’s a device out there on the line which cannot be identilfied. Surprise surprise, I’ve never yet seen a couple of resistors sucsessfully pretendint to be a USB HID device or a mass storage device or whatever it is. I guess I could find the MCU for some $5 somewhere out here, but my biggest concern is the screen - If it went dead I’ll be unable to do anything with it. Currently I’m looking for ways to test it with STM32VL-Discovery board. But didn’t manage to find the documentation for the screen so far (that’s how I ended up here).
Meanwhile as I can’t live without an oscilloscope I ordered Quad for myself (anyways I’ve always wanted more than one channel). But I can’t imaging how I will be spending those 6 weeks that Russian Post takes to deliver something from the border down here to Moscow.