Cant get your radio to work? General Hardware issues?
Hi Andrew,andrewju wrote: ↑Tue May 16, 2017 9:40 pmGood news! I got my EEPROM chips today!
I'll post some pics to illustrate the process (just showing off my new USB "microscope", really... ).
So, this is the original EEPROM chip we're about to replace:
A closer look:
It's an M24C02-W, which is rated for 2.5 to 5.5V. FrSky told me the chip should be M24C02-R, which is 1.8 to 5.5V. In fact, I don't think it makes any difference, since MCU voltage is 3.3V and that's the voltage that should be feeding the EEPROM as well. Anyway, the new chip will follow FrSky's recommendation.
Here's the PCB with the chip removed:
And this is the new chip sitting on its place:
I switched it on, and ... no more annoying beeps! Everything works, the module is still talking to receivers, and telemetry is Ok, too.
Guess what! Last weekend another hobbyist came to me with exactly the same symptom on his XJT. The module beeps without any reason! Also, there's at least one YouTube video showing the same issue... So while it is not a widespread problem, it's not a unique case, either. I hope my experience will be of help to others.
BTW, I have plenty of these memory chips now.
PM me if you need help getting the parts or fixing your XJT.
Got the same problem with my 2 XJT modules.
Can you help me getting the M24C02-R chips? Please send me a pm.