diff --git a/mkapp/hal/HDZGOGGLE_RX.bin b/mkapp/hal/HDZGOGGLE_RX.bin
index c642ecf..61fba82 100644
Binary files a/mkapp/hal/HDZGOGGLE_RX.bin and b/mkapp/hal/HDZGOGGLE_RX.bin differ
diff --git a/mkapp/hal/HDZGOGGLE_VA.bin b/mkapp/hal/HDZGOGGLE_VA.bin
index 7ecf11e..366008d 100644
Binary files a/mkapp/hal/HDZGOGGLE_VA.bin and b/mkapp/hal/HDZGOGGLE_VA.bin differ
diff --git a/mkapp/hal/ver.txt b/mkapp/hal/ver.txt
index b6afec2..ac3687f 100755
--- a/mkapp/hal/ver.txt
+++ b/mkapp/hal/ver.txt
@@ -1 +1 @@
-77-182
+76-184
diff --git a/src/core/app_state.c b/src/core/app_state.c
index f22ee35..0f04112 100755
--- a/src/core/app_state.c
+++ b/src/core/app_state.c
@@ -79,6 +79,7 @@ void app_exit_menu() {
 }
 
 void app_switch_to_analog() {
+    system_exec("aww 0x0300b084 0x00001555"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
     Analog_Module_Power(0, 1);
 
     if (GOGGLE_VER_2) {
@@ -112,6 +113,7 @@ void app_switch_to_analog() {
     system_script(REC_STOP_LIVE);
 }
 void app_switch_to_av_in() {
+    system_exec("aww 0x0300b084 0x00001555"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
     Analog_Module_Power(0, 0);
 
     Source_AV(0);
@@ -134,6 +136,7 @@ void app_switch_to_av_in() {
 }
 
 void app_switch_to_hdmi_in() {
+    system_exec("aww 0x0300b084 0x00001555"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
     Analog_Module_Power(0, 0);
 
     Source_HDMI_in();
@@ -171,7 +174,7 @@ void app_switch_to_hdmi_in() {
 //    false = user selected from auto scan page
 void app_switch_to_hdzero(bool is_default) {
     int ch;
-
+    system_exec("aww 0x0300b084 0x00001555"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
     Analog_Module_Power(0, 0);
 
     if (is_default) {
diff --git a/src/driver/hardware.c b/src/driver/hardware.c
index a99b50c..7612054 100755
--- a/src/driver/hardware.c
+++ b/src/driver/hardware.c
@@ -475,7 +475,12 @@ void vclk_phase_set(video_source_t source, uint8_t reg_8d_sel) {
     else
         I2C_Write(ADDR_FPGA, 0x8d, (vclk_phase[source] >> 24) & 0xff);
 
-    I2C_Write(ADDR_FPGA, 0x8e, (vclk_phase[source] >> 16) & 0xff);
+    if (source == VIDEO_SOURCE_HDZERO_IN_720P60_50 || source == VIDEO_SOURCE_HDZERO_IN_720P90) {
+        I2C_Write(ADDR_FPGA, 0x8e, 0x01);
+    } else {
+        I2C_Write(ADDR_FPGA, 0x8e, (vclk_phase[source] >> 16) & 0xff);
+    }
+
     I2C_Write(ADDR_AL, 0x14, (vclk_phase[source] >> 8) & 0xff);
 
     IT66121_set_phase(vclk_phase[source] & 3, 0);
@@ -532,9 +537,9 @@ void pclk_phase_set(video_source_t source) {
     LOGI("pclk_phase_set %d", pclk_phase[source]);
     // bit[0] hdmi in
     if (source == VIDEO_SOURCE_HDMI_IN_1080P50 || source == VIDEO_SOURCE_HDMI_IN_1080P60 || source == VIDEO_SOURCE_HDMI_IN_1080POTHER) {
-        IT66021_Set_Pclk((pclk_phase[source] >> 0) & 1, 1);
+        IT66021_Set_Pclk((pclk_phase[source] >> 0) & 1);
     } else {
-        IT66021_Set_Pclk((pclk_phase[source] >> 0) & 1, 2);
+        IT66021_Set_Pclk((pclk_phase[source] >> 0) & 1);
     }
 
     // bit[1] analog in
@@ -611,7 +616,7 @@ void Display_UI_init() {
     I2C_Write(ADDR_FPGA, 0x84, 0x11);
 
     OLED_SetTMG(0);
-    system_exec("aww 0x0300b084 0x00015565"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
+    system_exec("aww 0x0300b084 0x00002aaa"); // Set vdpo clock driver strength to level 2. Refer datasheet 12.7.5.11
 
     if (GOGGLE_VER_2)
         I2C_Write(ADDR_FPGA, 0xa7, 0x00);
diff --git a/src/driver/it66021.c b/src/driver/it66021.c
index 41cb0b5..26ff6dc 100755
--- a/src/driver/it66021.c
+++ b/src/driver/it66021.c
@@ -340,10 +340,6 @@ void IT66021_edid() {
     I2C_L_Write(0x49, 0xc0, 0x04);
 }
 
-void IT66021_Set_Pclk(int inv, int dly) {
-    IT66021_Mask_WR(0, 0x0f, 0x03, 0x00);
-    if (inv)
-        I2C_L_Write(ADDR_IT66021, 0x50, 0xA0 + dly);
-    else
-        I2C_L_Write(ADDR_IT66021, 0x50, 0xB0 + dly);
+void IT66021_Set_Pclk(int inv) {
+    I2C_L_Write(ADDR_IT66021, 0x50, 0xB0);
 }
\ No newline at end of file
diff --git a/src/driver/it66021.h b/src/driver/it66021.h
index 98ce479..80a4f10 100755
--- a/src/driver/it66021.h
+++ b/src/driver/it66021.h
@@ -14,7 +14,7 @@ void IT66021_Set_CSMatrix(int cs);
 int IT66021_Get_PCLKFREQ();
 void IT66021_edid();
 
-void IT66021_Set_Pclk(int inv, int dly);
+void IT66021_Set_Pclk(int inv);
 
 #ifdef __cplusplus
 }