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A5S dead after 2 years: buzzer, heater and dark screen
lslarry86
Posts: 4Member
I have an A5S bought on Amazon in 2018, working well with some fiddling, until yesterday. I took the hot end apart because of some extrusion issues. When I put it back together, I got a constant buzzer, and the extrusion heater was on. The LCD says "FAT Mount Fail," then "Enter FW" (I did not copy down the exact messages). The screen goes white, then black, with the buzzer blasting. After a few seconds the system shuts down. If I keep trying, the interval to shutdown gets shorter.
Opening the case, the STM32 feels warmer than I expect, but not super hot. I never touched it before so do not know what is normal there. One time I got the normal LCD screen by powering up while pressing the white button on the control board, but the buzzer was still going.
The control board says "A3S A5S A1 Main Control V1.1" 11/21/2018
Reading that heater shorts sometimes cause this kind of thing, I disconnected the hot lead of the extrusion heater at the control board. That also stopped the heater from smoking off its old skin of melted PLA. No effect. The bed heater cable is intact but I don't know where to disconnect it to be sure.
"A5S firmware - 20200622.zip" does not load. I tried two different SD cards, also tried extracting the ZIP. With SD card inserted, the LCD says "FAT Mount OK" then "FW Load Fail", then proceeds as above.
I have ST-Link and jgaurora A1_full_flash_clone.bin from another thread. Is it reasonable to JTAG this board, or does the problem sound more electrical?
Comments
I suggest to try my latest 2.0g beta on firmware.jgmakerwiki.com
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