diff --git a/Marlin/src/inc/Conditionals_post.h b/Marlin/src/inc/Conditionals_post.h
index e580b2d963fb..3adfddd4620e 100644
--- a/Marlin/src/inc/Conditionals_post.h
+++ b/Marlin/src/inc/Conditionals_post.h
@@ -511,7 +511,7 @@
  */
 #if ENABLED(SDSUPPORT)
 
-  #if HAS_SD_HOST_DRIVE && SD_CONNECTION_IS(ONBOARD)
+  #if HAS_SD_HOST_DRIVE && SD_CONNECTION_IS(ONBOARD) && DISABLED(KEEP_SD_DETECT)
     //
     // The external SD card is not used. Hardware SPI is used to access the card.
     // When sharing the SD card with a PC we want the menu options to
diff --git a/Marlin/src/pins/lpc1769/pins_TH3D_EZBOARD.h b/Marlin/src/pins/lpc1769/pins_TH3D_EZBOARD.h
index 12a7934a3ead..f39b0374c28a 100644
--- a/Marlin/src/pins/lpc1769/pins_TH3D_EZBOARD.h
+++ b/Marlin/src/pins/lpc1769/pins_TH3D_EZBOARD.h
@@ -138,7 +138,7 @@
 
 #define SDCARD_CONNECTION                ONBOARD
 
-//#define SD_DETECT_PIN                    P0_25  // SD_CD
+#define SD_DETECT_PIN                      P0_27  // SD_CD
 #define SD_SCK_PIN                         P0_07
 #define SD_MISO_PIN                        P0_08
 #define SD_MOSI_PIN                        P0_09