Fix freezing and MINTEMP Error with MAX31855 thermocouple

Marlin/Marlin_main.cpp

@@ -9737,9 +9737,11 @@ void setup() {
       safe_delay(BOOTSCREEN_TIMEOUT);
     #elif ENABLED(ULTRA_LCD)
       bootscreen();
+      #if DISABLED(SDSUPPORT)
         lcd_init();
       #endif
     #endif
+  #endif
 
   #if ENABLED(MIXING_EXTRUDER) && MIXING_VIRTUAL_TOOLS > 1
     // Initialize mixing to 100% color 1

Marlin/temperature.cpp

@@ -1001,14 +1001,11 @@ void Temperature::init() {
 
   #if ENABLED(HEATER_0_USES_MAX6675)
 
-    #if DISABLED(SDSUPPORT)
     OUT_WRITE(SCK_PIN, LOW);
     OUT_WRITE(MOSI_PIN, HIGH);
     SET_INPUT(MISO_PIN);
-      WRITE(MISO_PIN,1);
-    #else
+    WRITE(MISO_PIN, HIGH);
     OUT_WRITE(SS_PIN, HIGH);
-    #endif
 
     OUT_WRITE(MAX6675_SS, HIGH);