diff -Naur mythtv-master-20201010-g68e85b9-old/mythtv/libs/libmythtv/diseqc.cpp mythtv-master-20201010-g68e85b9-new/mythtv/libs/libmythtv/diseqc.cpp
--- mythtv-master-20201010-g68e85b9-old/mythtv/libs/libmythtv/diseqc.cpp	2020-10-10 16:07:19.956666666 +0200
+++ mythtv-master-20201010-g68e85b9-new/mythtv/libs/libmythtv/diseqc.cpp	2020-10-10 16:07:21.493333333 +0200
@@ -512,8 +512,13 @@
         return false;
     }
 
-    // apply any voltage change
-    ApplyVoltage(settings, tuning);
+    // apply any voltage change for non-SCR systems
+    DiSEqCDevSCR *scr = FindSCR(settings);
+    if (!scr)
+        ApplyVoltage(settings, tuning);
+    else
+        LOG(VB_CHANNEL, LOG_INFO, LOC + "SCR bus->skiping setting LNB Voltage");
+
 
     // turn off tone burst first if commands need to be sent
     if (m_root->IsCommandNeeded(settings, tuning))
@@ -754,13 +759,15 @@
         diseqc_bus_already_reset = false;
     }
 
+    // make sure the bus is powered
+    SetVoltage(SEC_VOLTAGE_18);
+    usleep(DISEQC_POWER_ON_WAIT);
+    // some DiSEqC devices need more time. see #8465
+    usleep(DISEQC_POWER_ON_WAIT);
+
+
     if (!diseqc_bus_already_reset || !is_SCR)
     {
-        // make sure the bus is powered
-        SetVoltage(SEC_VOLTAGE_18);
-        usleep(DISEQC_POWER_ON_WAIT);
-        // some DiSEqC devices need more time. see #8465
-        usleep(DISEQC_POWER_ON_WAIT);
 
         // issue a global reset command
         LOG(VB_CHANNEL, LOG_INFO, LOC + "Resetting DiSEqC Bus");