diff --git a/apps/hardware_test/Makefile b/apps/hardware_test/Makefile
index 1465a8307..577e59bb5 100644
--- a/apps/hardware_test/Makefile
+++ b/apps/hardware_test/Makefile
@@ -8,6 +8,7 @@ app_src += $(addprefix apps/hardware_test/,\
   keyboard_test_controller.cpp \
   keyboard_view.cpp \
   lcd_data_test_controller.cpp \
+  lcd_timing_test_controller.cpp \
   led_test_controller.cpp \
   pop_up_controller.cpp \
   serial_number_controller.cpp \
diff --git a/apps/hardware_test/app.cpp b/apps/hardware_test/app.cpp
index a9f110771..7ffb5c131 100644
--- a/apps/hardware_test/app.cpp
+++ b/apps/hardware_test/app.cpp
@@ -21,6 +21,7 @@ App::App(Container * container, Snapshot * snapshot) :
 App::WizardViewController::WizardViewController(Responder * parentResponder) :
   BankViewController(parentResponder),
   m_batteryTestController(this),
+  m_lcdTimingTestController(this),
   m_colorsLCDTestController(this),
   m_deadPixelsTestController(this),
   m_keyboardController(this),
@@ -32,12 +33,13 @@ App::WizardViewController::WizardViewController(Responder * parentResponder) :
 }
 
 int App::WizardViewController::numberOfChildren() {
-  return 8;
+  return 9;
 }
 
 ViewController * App::WizardViewController::childAtIndex(int i) {
   ViewController * children[] = {
     &m_vBlankTestController,
+    &m_lcdTimingTestController,
     &m_colorsLCDTestController,
     &m_lcdDataTestController,
     &m_deadPixelsTestController,
diff --git a/apps/hardware_test/app.h b/apps/hardware_test/app.h
index d4ca1b607..3774173e7 100644
--- a/apps/hardware_test/app.h
+++ b/apps/hardware_test/app.h
@@ -7,6 +7,7 @@
 #include "dead_pixels_test_controller.h"
 #include "keyboard_test_controller.h"
 #include "lcd_data_test_controller.h"
+#include "lcd_timing_test_controller.h"
 #include "led_test_controller.h"
 #include "serial_number_controller.h"
 #include "vblank_test_controller.h"
@@ -31,6 +32,7 @@ private:
     bool handleEvent(Ion::Events::Event event) override;
   private:
     BatteryTestController m_batteryTestController;
+    LCDTimingTestController m_lcdTimingTestController;
     ColorsLCDTestController m_colorsLCDTestController;
     DeadPixelsTestController m_deadPixelsTestController;
     KeyboardTestController m_keyboardController;
diff --git a/apps/hardware_test/colors_lcd_test_controller.cpp b/apps/hardware_test/colors_lcd_test_controller.cpp
index bf708894d..25a14f535 100644
--- a/apps/hardware_test/colors_lcd_test_controller.cpp
+++ b/apps/hardware_test/colors_lcd_test_controller.cpp
@@ -17,7 +17,7 @@ bool ColorsLCDTestController::handleEvent(Ion::Events::Event event) {
 }
 
 void ColorsLCDTestController::viewWillAppear() {
-  bool testOK = Shared::POSTAndHardwareTests::ColorsLCDOK();
+  bool testOK = Shared::POSTAndHardwareTests::ColorsLCDPixelFailures() <= k_numberOfAcceptablesGlyphErrors;
   m_view.setColor(testOK ? KDColorGreen : KDColorRed);
   m_view.colorsLCDStateTextView()->setText(testOK ? k_colorsLCDOKText : k_colorsLCDFailTest);
 }
diff --git a/apps/hardware_test/colors_lcd_test_controller.h b/apps/hardware_test/colors_lcd_test_controller.h
index 02aae289c..91cd15e73 100644
--- a/apps/hardware_test/colors_lcd_test_controller.h
+++ b/apps/hardware_test/colors_lcd_test_controller.h
@@ -30,6 +30,7 @@ private:
     }
     BufferTextView m_colorsLCDStateView;
   };
+  constexpr static int k_numberOfAcceptablesGlyphErrors = 1;
   constexpr static const char * k_colorsLCDOKText = "COLORS LCD: OK";
   constexpr static const char * k_colorsLCDFailTest = "COLORS LCD: FAIL";
   ContentView m_view;
diff --git a/apps/hardware_test/lcd_data_test_controller.cpp b/apps/hardware_test/lcd_data_test_controller.cpp
index 1d5be7c38..d7294f3be 100644
--- a/apps/hardware_test/lcd_data_test_controller.cpp
+++ b/apps/hardware_test/lcd_data_test_controller.cpp
@@ -1,13 +1,20 @@
 #include "lcd_data_test_controller.h"
 #include <apps/shared/post_and_hardware_tests.h>
 #include <ion/display.h>
+#include <poincare/print_int.h>
 
 using namespace Poincare;
 
 namespace HardwareTest {
 
+void LCDDataTestController::runTest() {
+  int pixelFailures = Shared::POSTAndHardwareTests::LCDDataGlyphFailures();
+  m_testSuccessful = pixelFailures <= k_errorLimit;
+  m_view.setStatus(m_testSuccessful, pixelFailures);
+}
+
 bool LCDDataTestController::handleEvent(Ion::Events::Event event) {
-  if (event == Ion::Events::OK && strcmp(m_view.lcdDataStateTextView()->text(), k_lcdDataOKText) == 0) {
+  if (event == Ion::Events::OK && m_testSuccessful) {
     // Handled in WizardViewController
     return false;
   }
@@ -15,24 +22,30 @@ bool LCDDataTestController::handleEvent(Ion::Events::Event event) {
 }
 
 void LCDDataTestController::viewWillAppear() {
-  bool testOK = Shared::POSTAndHardwareTests::LCDDataOK();
-  m_view.lcdDataStateTextView()->setText(testOK ? k_lcdDataOKText : k_lcdDataFailTest);
-  m_view.setColor(testOK ? KDColorGreen : KDColorRed);
+  runTest();
 }
 
 LCDDataTestController::ContentView::ContentView() :
   SolidColorView(KDColorWhite),
-  m_lcdDataStateView(KDFont::LargeFont)
+  m_lcdDataStateView(KDFont::LargeFont),
+  m_lcdNumberPixelFailuresView(KDFont::SmallFont)
 {
 }
 
-void LCDDataTestController::ContentView::setColor(KDColor color) {
-  SolidColorView::setColor(color);
-  m_lcdDataStateView.setBackgroundColor(color);
+void LCDDataTestController::ContentView::setStatus(bool success, int numberOfErrors) {
+  KDColor backgroundColor = (success ? KDColorGreen : KDColorRed);
+  m_lcdDataStateView.setBackgroundColor(backgroundColor);
+  m_lcdNumberPixelFailuresView.setBackgroundColor(backgroundColor);
+  m_lcdDataStateView.setText(success ? k_lcdDataPassTest : k_lcdDataFailTest);
+  constexpr int bufferSize = 20;
+  char buffer[bufferSize] = {0};
+  Poincare::PrintInt::Left(numberOfErrors, buffer, bufferSize);
+  m_lcdNumberPixelFailuresView.setText(buffer);
 }
 
 void LCDDataTestController::ContentView::layoutSubviews() {
   m_lcdDataStateView.setFrame(KDRect(0, 0, Ion::Display::Width, Ion::Display::Height));
+  m_lcdNumberPixelFailuresView.setFrame(KDRect(10, 10, Ion::Display::Width, 20));
 }
 
 }
diff --git a/apps/hardware_test/lcd_data_test_controller.h b/apps/hardware_test/lcd_data_test_controller.h
index eacb69689..48c85ae5b 100644
--- a/apps/hardware_test/lcd_data_test_controller.h
+++ b/apps/hardware_test/lcd_data_test_controller.h
@@ -10,6 +10,7 @@ class LCDDataTestController : public ViewController {
 public:
   LCDDataTestController(Responder * parentResponder) :
     ViewController(parentResponder),
+    m_testSuccessful(false),
     m_view()
   {}
   View * view() override { return &m_view; }
@@ -19,20 +20,22 @@ private:
   class ContentView : public SolidColorView {
   public:
     ContentView();
-    BufferTextView * lcdDataStateTextView() { return &m_lcdDataStateView; }
-    void setColor(KDColor color) override;
+    void setStatus(bool success, int numberOfErrors);
   private:
+    constexpr static const char * k_lcdDataPassTest = "LCD DATA: OK";
+    constexpr static const char * k_lcdDataFailTest = "LCD DATA: FAIL";
     void layoutSubviews() override;
-    int numberOfSubviews() const override { return 1; }
+    int numberOfSubviews() const override { return 2; }
     View * subviewAtIndex(int index) override {
-      assert(index == 0);
-      return &m_lcdDataStateView;
+      assert(index >= 0 && index < 2);
+      return index == 0 ? &m_lcdDataStateView : &m_lcdNumberPixelFailuresView;
     }
     BufferTextView m_lcdDataStateView;
+    BufferTextView m_lcdNumberPixelFailuresView;
   };
-  constexpr static const char * k_lcdDataOKText = "LCD DATA: OK";
-  constexpr static const char * k_lcdDataFailTest = "LCD DATA: FAIL";
-
+  static constexpr int k_errorLimit = 1;
+  void runTest();
+  bool m_testSuccessful;
   ContentView m_view;
 };
 
diff --git a/apps/hardware_test/lcd_timing_test_controller.cpp b/apps/hardware_test/lcd_timing_test_controller.cpp
new file mode 100644
index 000000000..4f759a3f9
--- /dev/null
+++ b/apps/hardware_test/lcd_timing_test_controller.cpp
@@ -0,0 +1,51 @@
+#include "lcd_timing_test_controller.h"
+#include <apps/shared/post_and_hardware_tests.h>
+#include <ion/display.h>
+#include <poincare/print_int.h>
+
+using namespace Poincare;
+
+namespace HardwareTest {
+
+void LCDTimingTestController::runTest() {
+  int pixelFailures = Shared::POSTAndHardwareTests::LCDTimingGlyphFailures();
+  m_testSuccessful = pixelFailures < k_errorLimit;
+  m_view.setStatus(m_testSuccessful, pixelFailures);
+}
+
+bool LCDTimingTestController::handleEvent(Ion::Events::Event event) {
+  if (event == Ion::Events::OK && m_testSuccessful) {
+    // Handled in WizardViewController
+    return false;
+  }
+  return true;
+}
+
+void LCDTimingTestController::viewWillAppear() {
+  runTest();
+}
+
+LCDTimingTestController::ContentView::ContentView() :
+  SolidColorView(KDColorWhite),
+  m_lcdTimingStateView(KDFont::LargeFont),
+  m_lcdNumberGlyphFailuresView(KDFont::SmallFont)
+{
+}
+
+void LCDTimingTestController::ContentView::setStatus(bool success, int numberOfErrors) {
+  KDColor backgroundColor = (success ? KDColorGreen : KDColorRed);
+  m_lcdTimingStateView.setBackgroundColor(backgroundColor);
+  m_lcdNumberGlyphFailuresView.setBackgroundColor(backgroundColor);
+  m_lcdTimingStateView.setText(success ? k_lcdTimingPassTest : k_lcdTimingFailTest);
+  constexpr int bufferSize = 20;
+  char buffer[bufferSize] = {0};
+  Poincare::PrintInt::Left(numberOfErrors, buffer, bufferSize);
+  m_lcdNumberGlyphFailuresView.setText(buffer);
+}
+
+void LCDTimingTestController::ContentView::layoutSubviews() {
+  m_lcdTimingStateView.setFrame(KDRect(0, 0, Ion::Display::Width, Ion::Display::Height));
+  m_lcdNumberGlyphFailuresView.setFrame(KDRect(10, 10, Ion::Display::Width, 20));
+}
+
+}
diff --git a/apps/on_boarding/power_on_self_test.cpp b/apps/on_boarding/power_on_self_test.cpp
index 921be6b26..f83e30347 100644
--- a/apps/on_boarding/power_on_self_test.cpp
+++ b/apps/on_boarding/power_on_self_test.cpp
@@ -8,13 +8,8 @@ KDColor PowerOnSelfTest::Perform() {
   KDColor previousLEDColor = Ion::LED::getColor();
   KDColor resultColor = KDColorGreen;
 
-  /* Screen tests
-   * CAUTION: Timing is important. TextLCDTestOK fails only if done at an
-   * unknown time, which happens to be for VBlankOK being done just before.
-   * TextLCDTestOK is done many times in a row in the HardwareTest, so if the
-   * screen passes the POST and fails the Hardware Test, we will need to find
-   * the right time to sleep here before launching TextLCDTestOK. */
-  bool screenTestsOK = Shared::POSTAndHardwareTests::VBlankOK() && Shared::POSTAndHardwareTests::TextLCDTestOK();
+  // Screen tests
+  bool screenTestsOK = Shared::POSTAndHardwareTests::VBlankOK() && (Shared::POSTAndHardwareTests::TextLCDGlyphFailures() <= k_textErrorsLimit);
   // We push a white screen so that the LCD Data test is invisible for the user.
   Ion::Display::pushRectUniform(KDRect(0, 0, Ion::Display::Width, Ion::Display::Height), KDColorWhite);
   Ion::Display::waitForVBlank();
diff --git a/apps/on_boarding/power_on_self_test.h b/apps/on_boarding/power_on_self_test.h
index 58d45e699..aa5991a1d 100644
--- a/apps/on_boarding/power_on_self_test.h
+++ b/apps/on_boarding/power_on_self_test.h
@@ -11,7 +11,7 @@ public:
    * returns the LED color previous to the tests. */
   static KDColor Perform();
 private:
-  constexpr static int k_LCDTestIterationsCount = 5;
+  constexpr static int k_textErrorsLimit = 0;
 };
 
 }
diff --git a/apps/shared/post_and_hardware_tests.cpp b/apps/shared/post_and_hardware_tests.cpp
index 992485b6e..f830ac28b 100644
--- a/apps/shared/post_and_hardware_tests.cpp
+++ b/apps/shared/post_and_hardware_tests.cpp
@@ -4,6 +4,8 @@
 #include <ion/timing.h>
 #include <kandinsky/font.h>
 #include <kandinsky/ion_context.h>
+#include <ion/src/device/shared/drivers/display.h>
+
 
 namespace Shared {
 
@@ -19,66 +21,63 @@ bool POSTAndHardwareTests::VBlankOK() {
   return result;
 }
 
-bool POSTAndHardwareTests::TextLCDTestOK() {
-  const char * text = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
+int POSTAndHardwareTests::LCDDataGlyphFailures() {
+  Ion::Device::Display::initPanel();
+  return Ion::Display::displayColoredTilingSize10();
+}
+
+int POSTAndHardwareTests::LCDTimingGlyphFailures() {
+  Ion::Device::Display::initPanel();
+  int numberOfFailures = 0;
+  for (int i = 0; i < 500; i++) {
+    Ion::Display::POSTPushMulticolor(k_stampSize);
+    KDColor stamp[k_stampSize*k_stampSize];
+    for (int i = 0; i < 3; i++) { // TODO LEA 1?
+      for (int j = 0; j < 3; j++) {
+        Ion::Display::pullRect(KDRect(i * k_stampSize, j * k_stampSize, k_stampSize, k_stampSize), stamp);
+        int shift = (i+j) % 16;
+        uint16_t color = (uint16_t)(1 << shift);
+        for (int k = 0; k < k_stampSize*k_stampSize; k++) {
+          if (stamp[k] != color) {
+            numberOfFailures++;
+            break;
+          }
+          color ^= 0xFFFF;
+        }
+      }
+    }
+    Ion::Timing::msleep(10);
+  }
+  return numberOfFailures;
+}
+
+int POSTAndHardwareTests::ColorsLCDPixelFailures() {
+  int result = 0;
+  constexpr KDColor k_colors[] = {KDColorBlack, KDColorRed, KDColorBlue, KDColorGreen, KDColorWhite};
+  for (KDColor c : k_colors) {
+    result += Ion::Display::displayUniformTilingSize10(c);
+  }
+  return result;
+}
+
+int POSTAndHardwareTests::TextLCDGlyphFailures() {
+  const char * text = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
   const KDFont * font = KDFont::SmallFont;
   KDCoordinate glyphHeight = font->glyphSize().height();
 
   // Fill the screen
+  KDIonContext * context = KDIonContext::sharedContext();
+  context->setOrigin(KDPointZero);
+  context->setClippingRect(KDRect(KDPointZero, Ion::Display::Width, Ion::Display::Height));
   for (int i = 0; i < Ion::Display::Height / glyphHeight; i++) {
-    KDIonContext::sharedContext()->drawString(text, KDPoint(0, i * glyphHeight), font);
+    context->drawString(text, KDPoint(0, i * glyphHeight), font);
   }
   // Check the drawing
   int numberOfFailures = 0;
   for (int i = 0; i < Ion::Display::Height / glyphHeight; i++) {
-    numberOfFailures += KDIonContext::sharedContext()->checkDrawnString(text, KDPoint(0, i * glyphHeight), font);
-    if (numberOfFailures > k_acceptableNumberOfFailures) {
-      return false;
-    }
+    numberOfFailures += context->checkDrawnString(text, KDPoint(0, i * glyphHeight), font);
   }
-  return true;
-}
-
-bool POSTAndHardwareTests::LCDDataOK() {
-  for (int iteration = 0; iteration < k_numberOfLCDIterations; iteration++) {
-    if (!TextLCDTestOK() || !TilingLCDTestOK()) {
-      return false;
-    }
-  }
-  return true;
-}
-
-bool POSTAndHardwareTests::ColorsLCDOK() {
-  constexpr KDColor k_colors[] = {KDColorBlack, KDColorRed, KDColorBlue, KDColorGreen, KDColorWhite};
-  for (KDColor c : k_colors) {
-    if (Ion::Display::displayUniformTilingSize10(c) > k_acceptableNumberOfFailures) {
-      return false;
-    }
-  }
-  return true;
-}
-
-bool POSTAndHardwareTests::TilingLCDTestOK() {
-  Ion::Display::POSTPushMulticolor(k_stampSize);
-  KDColor stamp[k_stampSize*k_stampSize];
-  int numberOfFailures = 0;
-  for (int i = 0; i < Ion::Display::Width / k_stampSize; i++) {
-    for (int j = 0; j < Ion::Display::Height / k_stampSize; j++) {
-      Ion::Display::pullRect(KDRect(i * k_stampSize, j * k_stampSize, k_stampSize, k_stampSize), stamp);
-      int shift = (i+j) % 16;
-      uint16_t color = (uint16_t)(1 << shift);
-      for (int k = 0; k < k_stampSize*k_stampSize; k++) {
-        if (stamp[k] != color) {
-          numberOfFailures++;
-          if (numberOfFailures > k_acceptableNumberOfFailures) {
-            return false;
-          }
-        }
-        color ^= 0xFFFF;
-      }
-    }
-  }
-  return true;
+  return numberOfFailures;
 }
 
 }
diff --git a/apps/shared/post_and_hardware_tests.h b/apps/shared/post_and_hardware_tests.h
index 4e2dcb9f7..561e1e9a2 100644
--- a/apps/shared/post_and_hardware_tests.h
+++ b/apps/shared/post_and_hardware_tests.h
@@ -6,29 +6,17 @@
 
 namespace Shared {
 
+// TODO LEA: comment about ColorsLCDPixelFailures and detected screen issues
 class POSTAndHardwareTests {
 public:
   static bool BatteryOK();
   static bool VBlankOK();
-  static bool TextLCDTestOK();
-  /* LCDDataOK carefully tests the LCD controller. It verifies that:
-   * - Command/data switching is OK,
-   * - Data is correctly sent,
-   * - There are no short-circuits between the data wires.
-   * LCDDataOK thus sends a tiled pattern (to test command/data switching),
-   * where each tile is a checker of a color and its contrary (to tests that
-   * Data is sent OK). To test each of the 16 data wires for short-circuits, 16
-   * colors are used: 2**k with 0 <= k < 16. */
-  static bool LCDDataOK();
-  static bool ColorsLCDOK();
+  static int LCDDataGlyphFailures();
+  static int LCDTimingGlyphFailures();
+  static int ColorsLCDPixelFailures();
+  static int TextLCDGlyphFailures();
 private:
-  constexpr static int k_stampSize = 8;
-  constexpr static int k_numberOfLCDIterations = 20;
-  constexpr static int k_acceptableNumberOfFailures = 2;
-  static bool TilingLCDTestOK();
-  static_assert(Ion::Display::Width % k_stampSize == 0, "Stamps must tesselate the display");
-  static_assert(Ion::Display::Height % k_stampSize == 0, "Stamps must tesselate the display");
-  static_assert(k_stampSize % 2 == 0, "Even number of XOR needed.");
+  static constexpr int k_stampSize = 8;
 };
 
 }
diff --git a/ion/include/ion/display.h b/ion/include/ion/display.h
index 5869e1c54..af98239a3 100644
--- a/ion/include/ion/display.h
+++ b/ion/include/ion/display.h
@@ -29,8 +29,9 @@ constexpr int WidthInTenthOfMillimeter = 576;
 constexpr int HeightInTenthOfMillimeter = 432;
 
 // For Power On Self tests
+int displayUniformTilingSize10(KDColor c);
+int displayColoredTilingSize10();
 void POSTPushMulticolor(int tileSize);
-int displayUniformTilingSize10(KDColor color);
 
 }
 }
diff --git a/ion/src/device/bench/Makefile b/ion/src/device/bench/Makefile
index 34beb84bb..096a93182 100644
--- a/ion/src/device/bench/Makefile
+++ b/ion/src/device/bench/Makefile
@@ -18,6 +18,7 @@ bench_src += $(addprefix ion/src/device/bench/command/, \
   keyboard.cpp \
   lcd_data.o \
   lcd_pins.o \
+  lcd_timing.o \
   led.cpp \
   mcu_serial.cpp \
   ping.cpp \
diff --git a/ion/src/device/bench/bench.cpp b/ion/src/device/bench/bench.cpp
index e992a730b..05b042278 100644
--- a/ion/src/device/bench/bench.cpp
+++ b/ion/src/device/bench/bench.cpp
@@ -20,6 +20,7 @@ constexpr CommandHandler handles[] = {
   CommandHandler("KEYBOARD", Command::Keyboard),
   CommandHandler("LCD_DATA", Command::LCDData),
   CommandHandler("LCD_PINS", Command::LCDPins),
+  CommandHandler("LCD_TIMING", Command::LCDTiming),
   CommandHandler("LED", Command::LED),
   CommandHandler("MCU_SERIAL", Command::MCUSerial),
   CommandHandler("PING", Command::Ping),
diff --git a/ion/src/device/bench/command/command.h b/ion/src/device/bench/command/command.h
index f00ce6305..7e904501d 100644
--- a/ion/src/device/bench/command/command.h
+++ b/ion/src/device/bench/command/command.h
@@ -21,6 +21,7 @@ void Jump(const char * input);
 void Keyboard(const char * input);
 void LCDData(const char * input);
 void LCDPins(const char * input);
+void LCDTiming(const char * input);
 void LED(const char * input);
 void MCUSerial(const char * input);
 void Ping(const char * input);
diff --git a/ion/src/device/bench/command/lcd_data.cpp b/ion/src/device/bench/command/lcd_data.cpp
index 32e0fb672..705bf70ac 100644
--- a/ion/src/device/bench/command/lcd_data.cpp
+++ b/ion/src/device/bench/command/lcd_data.cpp
@@ -1,5 +1,6 @@
 #include "command.h"
 #include <apps/shared/post_and_hardware_tests.h>
+#include <poincare/print_int.h>
 
 namespace Ion {
 namespace Device {
@@ -11,10 +12,16 @@ void LCDData(const char * input) {
     reply(sSyntaxError);
     return;
   }
-  /* TODO: Find better place for LCDDataOK than
+  /* TODO: Find better place for LCDDataGlyphFailures than
    * apps/shared/post_and_hardware_tests. Problem is it needs Kandinsky so Ion
    * might not be the best place. Maybe move the bench out of Ion? */
-  reply(Shared::POSTAndHardwareTests::LCDDataOK() ? sOK : sKO);
+  constexpr int bufferSize = 6+10+1; // crc is a uint32_t so 10 digits long.
+  char buffer[bufferSize] = {'D', 'E', 'L', 'T', 'A', '='};
+  for (int i  = 6; i < bufferSize; i++) {
+    buffer[i] = 0;
+  }
+  Poincare::PrintInt::Left(Shared::POSTAndHardwareTests::LCDDataGlyphFailures(), buffer+4, bufferSize - 4 - 1);
+  reply(buffer);
 }
 
 }
diff --git a/ion/src/device/bench/command/lcd_timing.cpp b/ion/src/device/bench/command/lcd_timing.cpp
new file mode 100644
index 000000000..f02bc4b48
--- /dev/null
+++ b/ion/src/device/bench/command/lcd_timing.cpp
@@ -0,0 +1,30 @@
+#include "command.h"
+#include <apps/shared/post_and_hardware_tests.h>
+#include <poincare/print_int.h>
+
+namespace Ion {
+namespace Device {
+namespace Bench {
+namespace Command {
+
+void LCDTiming(const char * input) {
+  if (input != nullptr) {
+    reply(sSyntaxError);
+    return;
+  }
+  /* TODO: Find better place for LCDDataGlyphFailures than
+   * apps/shared/post_and_hardware_tests. Problem is it needs Kandinsky so Ion
+   * might not be the best place. Maybe move the bench out of Ion? */
+  constexpr int bufferSize = 6+10+1; // crc is a uint32_t so 10 digits long.
+  char buffer[bufferSize] = {'D', 'E', 'L', 'T', 'A', '='};
+  for (int i  = 6; i < bufferSize; i++) {
+    buffer[i] = 0;
+  }
+  Poincare::PrintInt::Left(Shared::POSTAndHardwareTests::LCDTimingGlyphFailures(), buffer+4, bufferSize - 4 - 1);
+  reply(buffer);
+}
+
+}
+}
+}
+}
diff --git a/ion/src/device/shared/drivers/display.cpp b/ion/src/device/shared/drivers/display.cpp
index 630c0b0ef..59e72b054 100644
--- a/ion/src/device/shared/drivers/display.cpp
+++ b/ion/src/device/shared/drivers/display.cpp
@@ -87,8 +87,8 @@ bool waitForVBlank() {
 }
 
 void POSTPushMulticolor(int tileSize) {
-  const int maxI = Ion::Display::Width / tileSize;
-  const int maxJ = Ion::Display::Height / tileSize;
+  const int maxI = 3; // TODO 1 ?
+  const int maxJ = 3;
   for (int i = 0; i < maxI; i++) {
     for (int j = 0; j < maxJ; j++) {
       uint16_t k = (i+j) % 16;
@@ -104,30 +104,36 @@ int displayUniformTilingSize10(KDColor c) {
   constexpr int stampWidth = 10;
   static_assert(Ion::Display::Width % stampWidth == 0, "Stamps must tesselate the display");
   static_assert(Ion::Display::Height % stampHeight == 0, "Stamps must tesselate the display");
-  static_assert(stampHeight % 2 == 0 || stampWidth % 2 == 0, "Even number of XOR needed.");
 
-  KDColor stamp[stampWidth*stampHeight];
-  for (int i=0;i<stampWidth*stampHeight; i++) {
-    stamp[i] = c;
-  }
+  {
+    KDColor stamp[stampWidth*stampHeight];
+    for (int i=0;i<stampWidth*stampHeight; i++) {
+      stamp[i] = c;
+    }
 
-  for (int i=0; i<Ion::Display::Width/stampWidth; i++) {
-    for (int j=0; j<Ion::Display::Height/stampHeight; j++) {
-      Ion::Display::pushRect(KDRect(i*stampWidth, j*stampHeight, stampWidth, stampHeight), stamp);
+    for (int i=0; i<Ion::Display::Width/stampWidth; i++) {
+      for (int j=0; j<Ion::Display::Height/stampHeight; j++) {
+        Ion::Display::pushRect(KDRect(i*stampWidth, j*stampHeight, stampWidth, stampHeight), stamp);
+      }
     }
   }
 
   int numberOfInvalidPixels = 0;
+  constexpr int stampHeightPull = 80;
+  constexpr int stampWidthPull = 80;
+  KDColor stamp[stampHeightPull*stampHeightPull];
 
-  for (int i=0; i<Ion::Display::Width/stampWidth; i++) {
-    for (int j=0; j<Ion::Display::Height/stampHeight; j++) {
-      for (int k=0; k<stampWidth*stampHeight; k++) {
+  KDColor resetColor = (c == KDColorBlack ? KDColorWhite : KDColorBlack);
+  for (int i=0; i<Ion::Display::Width/stampWidthPull; i++) {
+    for (int j=0; j<Ion::Display::Height/stampHeightPull; j++) {
+      for (int k=0; k<stampWidthPull*stampHeightPull; k++) {
         stamp[k] = KDColorBlack;
       }
-      Ion::Display::pullRect(KDRect(i*stampWidth, j*stampHeight, stampWidth, stampHeight), stamp);
-      for (int k=0; k<stampWidth*stampHeight; k++) {
+      Ion::Display::pullRect(KDRect(i*stampWidthPull, j*stampHeightPull, stampWidthPull, stampHeightPull), stamp);
+      for (int k=0; k<stampWidthPull*stampHeightPull; k++) {
         if (stamp[k] != c) {
           numberOfInvalidPixels++;
+          break;
         }
       }
     }
@@ -136,6 +142,68 @@ int displayUniformTilingSize10(KDColor c) {
   return numberOfInvalidPixels;
 }
 
+int displayColoredTilingSize10() {
+  /* Draw a tiled pattern:
+   * On first pass, red / blue / red / blue...
+   * On second pass, blue / green / blue / green...
+   * On third pass, green / red / green / red...
+   * And so on. */
+
+  constexpr int stampSize = 10;
+  constexpr int numberOfStamps = 3;
+  static_assert(Ion::Display::Width % stampSize == 0, "Stamps must tesselate the display");
+  static_assert(Ion::Display::Height % stampSize == 0, "Stamps must tesselate the display");
+
+  KDColor stamps[numberOfStamps][stampSize*stampSize];
+  constexpr KDColor colorForStamp[numberOfStamps] = {KDColorRed, KDColorBlue, KDColorGreen};
+  for (int i=0; i<numberOfStamps; i++) {
+    KDColor c = colorForStamp[i];
+    KDColor * stamp = stamps[i];
+    for (int j=0; j<stampSize*stampSize; j++) {
+      stamp[j] = c;
+    }
+  }
+
+  int numberOfHorizontalTiles = Ion::Display::Width / stampSize;
+  int numberOfVerticalTiles = Ion::Display::Height / stampSize;
+
+  constexpr int numberOfPasses = 200;
+  int numberOfInvalidPixels = 0;
+
+  constexpr int stampHeightPull = 1;
+  constexpr int stampWidthPull = 1;
+  KDColor resultStamp[stampHeightPull*stampHeightPull];
+
+  for (int p=0; p<numberOfPasses; p++) {
+    // Push a checker pattern on the screen
+    int firstColorIndex = p%numberOfStamps;
+    int secondColorIndex = (p+1)%numberOfStamps;
+    KDColor * firstStamp = stamps[firstColorIndex];
+    KDColor * secondStamp = stamps[secondColorIndex];
+    // Draw the pattern
+    for (int j=0; j<numberOfVerticalTiles; j++) {
+      for (int i=0; i<numberOfHorizontalTiles; i++) {
+        KDRect tile(i*stampSize, j*stampSize, stampSize, stampSize);
+        Ion::Display::pushRect(tile, (i+j)%2 == 0 ? firstStamp : secondStamp);
+      }
+    }
+    // Check the pattern
+    for (int j=0; j<numberOfVerticalTiles; j++) {
+      for (int i=0; i<numberOfHorizontalTiles; i++) {
+        KDRect tile((i+1)*stampSize-stampWidthPull, (j+1)*stampSize-stampHeightPull, stampWidthPull, stampHeightPull);
+        Ion::Display::pullRect(tile, resultStamp);
+        KDColor c = colorForStamp[(i+j)%2 == 0 ? firstColorIndex : secondColorIndex];
+        for (int k = 0; k < stampWidthPull * stampHeightPull; k++) {
+          if (resultStamp[k] != c) {
+            numberOfInvalidPixels++;
+          }
+        }
+      }
+    }
+  }
+  return numberOfInvalidPixels;
+}
+
 }
 }
 
diff --git a/ion/src/shared/dummy/display.cpp b/ion/src/shared/dummy/display.cpp
index 4c824abc0..0b97ea83e 100644
--- a/ion/src/shared/dummy/display.cpp
+++ b/ion/src/shared/dummy/display.cpp
@@ -3,7 +3,11 @@
 void Ion::Display::POSTPushMulticolor(int tileSize) {
 }
 
-int displayUniformTilingSize10(uint16_t color) {
+int displayUniformTilingSize10(KDColor c) {
+  return 0;
+}
+
+int displayColoredTilingSize10() {
   return 0;
 }
 
diff --git a/kandinsky/src/context_text.cpp b/kandinsky/src/context_text.cpp
index 5420db940..2295274a1 100644
--- a/kandinsky/src/context_text.cpp
+++ b/kandinsky/src/context_text.cpp
@@ -66,6 +66,7 @@ KDPoint KDContext::pushOrPullString(const char * text, KDPoint p, const KDFont *
         for (int k = 0; k < glyphSize.height() * glyphSize.width(); k++) {
           if (colorBuffer[k] != workingColorBuffer[k]) {
             *result = (*result)+1;
+            break;
           }
         }
       }