diff --git a/boards/default_src/micropython/blocks/display_extern.js b/boards/default_src/micropython/blocks/display_extern.js
index 262ff826..063655a5 100644
--- a/boards/default_src/micropython/blocks/display_extern.js
+++ b/boards/default_src/micropython/blocks/display_extern.js
@@ -47,7 +47,6 @@ export const display_matrix_extern_show_image_or_string_delay = {
         this.appendValueInput('SUB')
             .setCheck("var");
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("space")
             .setCheck(Number)
@@ -71,7 +70,6 @@ export const display_matrix_extern_scroll_string = {
             .setCheck("var");
         this.setColour(DISPLAY_EXTERN_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
@@ -85,7 +83,6 @@ export const display_matrix_extern_scroll_string_delay = {
             .setCheck("var");
         this.setColour(DISPLAY_EXTERN_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.appendValueInput("space")
             .setCheck(Number)
@@ -106,7 +103,6 @@ export const display_matrix_extern_show_frame_string = {
             .setCheck("var");
         this.setColour(DISPLAY_EXTERN_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
@@ -120,7 +116,6 @@ export const display_matrix_extern_show_frame_string_delay = {
             .setCheck("var");
         this.setColour(DISPLAY_EXTERN_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.appendValueInput("time")
             .setCheck(Number)
@@ -1041,7 +1036,6 @@ export const tft_show_image_or_string_delay = {
         this.appendValueInput('SUB')
             .appendField(Blockly.Msg.MSG.catTFT);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -1077,7 +1071,6 @@ export const tft_scroll_string_delay = {
         this.appendValueInput('SUB')
             .appendField(Blockly.Msg.MSG.catTFT);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.appendValueInput("y")
             .setCheck(Number)
@@ -1106,7 +1099,6 @@ export const tft_show_frame_string_delay = {
         this.appendValueInput('SUB')
             .appendField(Blockly.Msg.MSG.catTFT);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.appendValueInput("size")
             .setCheck(Number)
@@ -1235,7 +1227,6 @@ export const lcd_show_image_or_string_delay = {
         this.appendValueInput('SUB')
             .appendField(Blockly.Msg.MSG.catLCD);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -1262,7 +1253,6 @@ export const lcd_print_string = {
         this.appendValueInput('SUB')
             .appendField(Blockly.Msg.MSG.catLCD);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_SERIAL_PRINT + Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -1420,7 +1410,6 @@ export const extern_oled_show_image_or_string_delay = {
             .setCheck("var")
             .appendField(Blockly.Msg.MSG.catOLED);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -1454,7 +1443,6 @@ export const extern_oled_scroll_string = {
             .setCheck("var")
             .appendField(Blockly.Msg.MSG.catOLED);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
@@ -1469,7 +1457,6 @@ export const extern_oled_scroll_string_delay = {
             .setCheck("var")
             .appendField(Blockly.Msg.MSG.catOLED);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.appendValueInput("y")
             .setCheck(Number)
@@ -1497,7 +1484,6 @@ export const extern_oled_show_frame_string = {
             .setCheck("var")
             .appendField(Blockly.Msg.MSG.catOLED);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
@@ -1512,7 +1498,6 @@ export const extern_oled_show_frame_string_delay = {
             .setCheck("var")
             .appendField(Blockly.Msg.MSG.catOLED);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.appendValueInput("size")
             .setCheck(Number)
diff --git a/boards/default_src/micropython/blocks/display_onboard.js b/boards/default_src/micropython/blocks/display_onboard.js
index 3fce60d0..5215a56e 100644
--- a/boards/default_src/micropython/blocks/display_onboard.js
+++ b/boards/default_src/micropython/blocks/display_onboard.js
@@ -28,7 +28,6 @@ export const display_show_image_or_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("space")
             .setCheck(Number)
@@ -54,7 +53,6 @@ export const display_scroll_string = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.setPreviousStatement(true, null);
         this.setNextStatement(true, null);
@@ -97,7 +95,6 @@ export const onboard_tft_scroll_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.appendValueInput("y")
             .setCheck(Number)
@@ -601,7 +598,6 @@ export const onboard_oled_show_image_or_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -632,7 +628,6 @@ export const onboard_oled_scroll_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_MICROBIT_JS_MONITOR_SCROLL_STRING);
         this.appendValueInput("y")
             .setCheck(Number)
@@ -657,7 +652,6 @@ export const onboard_oled_show_frame_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.appendValueInput("size")
             .setCheck(Number)
@@ -1137,7 +1131,6 @@ export const onboard_tft_show_image_or_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.OLED_DRAWSTR);
         this.appendValueInput("x")
             .setCheck(Number)
@@ -1175,7 +1168,6 @@ export const onboard_tft_show_frame_string_delay = {
     init: function () {
         this.setColour(DISPLAY_ONBOARD_HUE);
         this.appendValueInput('data')
-            .setCheck(String)
             .appendField(Blockly.Msg.MIXLY_ESP32_MONITOR_SHOW_FRAME);
         this.appendValueInput("size")
             .setCheck(Number)