openrcforums

Posted: **Wed Dec 22, 2021 11:59 pm**

Hello Everyone,
I recently performed a chip replacement on a Taranis X9D+. I also replaced both R76 and R77 with 12K (R76) and 2K4 (R77) like described in this post: https://openrcforums.com/forum/viewtopic.php?t=10031 . I now have 4.8V on R77 when plugged in via USB, no stm bootloader starting and nothing happening besides a quiet buzzing from the speaker. I am wondering if the resistor values are the same with plus and non plus version.

Posted: **Tue Feb 01, 2022 10:09 am**

X9D+:
R76 30.9K 1%
R77 10.0K 1%

X9D (rev 0.4):
R76 29.4K 1%
R77 10.0K 1%

An earlier circuit diagram for the X9D showed R76 as 12K 1% and R77 as 2K4 1%.

Mike

Posted: **Wed Feb 09, 2022 10:39 am**

I replaced the two resistors and now the radio works perfectly! Thank you very much mike.
Refuhr

openrcforums

Taranis X9D+ non 2019 Voltage on R76 4.8V Radio not starting only buzz from Speaker

Taranis X9D+ non 2019 Voltage on R76 4.8V Radio not starting only buzz from Speaker

Re: Taranis X9D+ non 2019 Voltage on R76 4.8V Radio not starting only buzz from Speaker

Re: Taranis X9D+ non 2019 Voltage on R76 4.8V Radio not starting only buzz from Speaker