| Electronics > Repair |
| Noco GB70 Jump Pack Repair |
| << < (4/4) |
| jerryk:
--- Quote from: grobius on October 22, 2024, 07:26:43 pm ---I wonder if anyone tried to dump the mcu fw and flash a new chip? --- End quote --- The underlying problem with the GB150, GB70 and GB40 is that the OEM MCU used is not available for purchase from NOCO AFAIK. In the Holtek product listing there is no drop in replacement since VSS and VDD are in the wrong location. This not the case in the GB50 and GB500 and GB500+. There actually 3 available MCU's that drop right in for these three. I'm not sure about the GB250 as I have never worked on one. I'm slowly trying to replicate the firmware for these. It's a tall task for me but I think there are those on this forum that could. Jerry |
| grobius:
Jerry, one question. Since the Noco custom MCU is mounted on a daughter board a solution could be to create a new daugter board that would fix the pin issue. Have you looked if it possible to dump the fw from the MCU? |
| jerryk:
On the GB70 pictured in this thread it is on a breakout board that is a pin match to the original MCU. This is not typical and to me is a result of the chip shortage as a result of the pandemic. Just a guess of sorts. You could certainly design a breakout/daughter type board to realign the pins from their available MCU's that would work for sure. There is that effort and then the task of reverse engineering the firmware that could make you question its value. As for dumping the firmware from another MCU, I have the E-link programmers but as I recall it takes their e-Writer series production programmers for any download functions and I just assume a company like NOCO would have the protection bit enabled. I have not forgot about the fact that you have some GB150's in the hospital waiting care. I'm willing to try to help or at least provide any reference measurements that might help save them from the landfill. Jerry |
| grobius:
I can donate one of the GB150s for the good casue 😉 Pm me I I'll see if its possible to ship to you. Br Johan |
| Navigation |
| Message Index |
| Previous page |