Products > Test Equipment
Brymen BM86x Backlight Duration Mod
joeqsmith:
--- Quote from: IanB on March 04, 2024, 06:41:47 pm ---To the best of my understanding, the backlight timer is programmed in the firmware. It can only be modified with new firmware, and that is not an aftermarket option. The only option would be to buy a new meter from current production.
--- End quote ---
https://youtu.be/bDIx4ik0vvA?t=698
Fungus:
Add a flip-flip to the LED circuit so that pushing the backlight button toggles it on/off.
mwb1100:
Has anyone dumped the EEPROM from any of the BM86x family (including the BM525/BM521)? I suspect there's a half decent chance that there's a byte in the EEPROM for the number of seconds the backlight stays on.
IanB:
I don't think anyone knows for sure that there is an EEPROM in the meter. Based on interactions between user joeqsmith and Brymen, it might be that the firmware is stored in non-erasable ROM and the only way to change it is by chip replacement.
shakalnokturn:
There's a difference between firmware in mask ROM or flash in the MCU and configuration data that may be also stored in the MCU (though not in mask or OTP ROM) or in an external EEPROM.
If you ask me the BM867 has a 24Cxx on the top PCB...
https://www.eevblog.com/forum/testgear/brymen-bm-867-teardown-pictures/?action=dlattach;attach=31973;image
BM869:
https://www.flickr.com/photos/eevblog/8513690107/in/album-72157632878242654/
BM525 has a lot of EEPROM must be mainly for the logging.
https://lygte-info.dk/pic/Brymen/BM525s/DSC_8868a.jpg
I have a dump from a Greenlee BM251 if that's of interest.
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