Thinking in what would have changed inside the CH341A that made it still work but not identify the ic, I got thinking in a nightmare repair I had in a laptop where one transistor was not totally gone, but would get stuck in one position, would sometimes close, and sometimes wouldn't, making so the screen didn't turn on with the machine booting. I kept fiddling with it for a bit until I gave up that and tried to think of any other way to test it. With the laptop I couldn't take readings as it didn't let me bypass IC ID check. On my pc, I could start the reading by selecting the ic manually, although empty, as the ic wasn't actually being identified, but couldn't take the multimeter readings there, so I got a laptop to do it in my workbench. I was just doing what you suggested, taking measurements on the points by reading it with the multimeter, not sure if that's what you meant with "watch" (I do not have an oscilloscope). I managed to get it working, although what I'm gonna say is possibly ridiculous and not the reason why. While in Read operation watch pins 'CLK', 'CS', 'MOSI' & 'MISO'. Tying any output to 3V for a short period is likely to be tolerated.Ĭonnect it launch the software, choose an IC from the list disable ID check and Read. Since the programmer, CH341A, is recognized both by OS and the software the CH341A isn't dead.īecause you've done the 3.3V voltage supply tweak if any input/output pins came in touch with 5V most likely these pins died.
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