diff --git a/radio/src/opentx.cpp b/radio/src/opentx.cpp
index 8f55e813d..bc064b17e 100644
--- a/radio/src/opentx.cpp
+++ b/radio/src/opentx.cpp
@@ -1950,6 +1950,11 @@ void opentxStart()
 #if defined(CPUARM) || defined(CPUM2560)
 void opentxClose()
 {
+#if defined(CPUARM)
+  watchdogSetTimeout(2000/*20s*/);
+#endif
+  pausePulses();   // stop mixer task to disable trims processing while in shutdown
+
   AUDIO_BYE();
 
 #if defined(FRSKY)
diff --git a/radio/src/tasks_arm.cpp b/radio/src/tasks_arm.cpp
index 903cd3198..3cf289b7a 100644
--- a/radio/src/tasks_arm.cpp
+++ b/radio/src/tasks_arm.cpp
@@ -239,8 +239,6 @@ void menusTask(void * pdata)
   toplcdOff();
 #endif
 
-  BACKLIGHT_OFF();
-
 #if defined(PCBHORUS)
   ledOff();
 #endif