| Electronics > Repair |
| Trying to troubleshoot a main board with Rockchip RK3288 microprocessor |
| << < (4/7) > >> |
| fzabkar:
I'm just curious. What are the complete markings on the ACT8846 chip? Is there a "490" marking anywhere? |
| Yamin:
--- Quote from: fzabkar on February 17, 2020, 12:57:26 am ---I'm just curious. What are the complete markings on the ACT8846 chip? Is there a "490" marking anywhere? --- End quote --- There is no marking "490" may I ask what that means? |
| fzabkar:
There are different versions of the ACT8846 which are preprogrammed with different voltages and different power-up sequences for each specific SoC. The RK3288 requires the ACT8846QM490 version (see pages 3 & 34 of datasheet). |
| jboy32:
Hi all First of all, happy new year 2022 :D I'm owner of a 2nd hand HR Pedalboard, and facing a known issue on this pedalboard effect that is related to USB. USB connect to my laptop has been working twice, but since 2 weeks, no possibility to connect, I have checked the USB wire with some others, tested on 3 different laptop with different OS running on, and different USB port. I still doesn't work. I have been reading different forum speaking about this known issue where, Headrush sometime fix it by changing the motherboard, or you need to buy a new one an fix it yourself ... when you see the original price of the pedalboard and the cost for a new motherboard, that is just amazing :-[ Mine still power up, but I can't add new IR or RIG because of the USB issue ... I have been looking inside the main motherboard that you are speaking about on this forum, and I'm wondering what could be the 2 buttons (Reset / Recovery ) ? |
| jboy32:
Some updates on my investigations After having unmounted the pedalboard, I found a motherboard that looks like the one of MPC Live. I have connected a wire Serial to USB and use TeraTerm. I have errors in the output of the terminal connected during the boot sequence : ... 001: dwc2 ff540000.usb: ff540000.usb supply vusb_d not found, using dummy regulator 001: dwc2 ff540000.usb: ff540000.usb supply vusb_a not found, using dummy regulator 001: dwc2 ff540000.usb: dwc2_check_params: Invalid parameter lpm_clock_gating=1 001: dwc2 ff540000.usb: dwc2_check_params: Invalid parameter besl=1 001: dwc2 ff540000.usb: dwc2_check_params: Invalid parameter hird_threshold_en=1 ... 001: usb5537 1-002d: Failed to write config file 001: usb5537 1-002d: failed to switch mode: -6 ... I have then a prompt for login, it is a linux running, but no chance to log into with root even with blank password :( Also when I put the headrush in Update Firmware mode from the screen touch (same as starting with recovery button on the motherboard), in the output of the terminal, I have this message Starting fastboot... ERROR: usb5537_write_config: failed to write config file: ret=-121 at drivers/misc/usb5537.c:69/usb5537_write_config() ERROR: board_usb_init: failed to probe usb5537@2d: ret=-121 at board/inmusic/az01/az01.c:525/board_usb_init() otg_phy_init I don't know if that could be a software issue or hardware issue for the moment but if those information can help to investigate let me know :) |
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