Samsung S23A350 – Samsung S27A350 TFT LCD
monitor Troubleshooting - Wiring Diagram
Troubleshooting
If the screen is blank, check whether the power cord is
connected correctly.
The circuits to check:
When the raster does not appear: The Function PCB, Main PCB
When 5V is generated but a blank screen is displayed: Main PCB
When the raster does not appear: The Function PCB, Main PCB
When 5V is generated but a blank screen is displayed: Main PCB
“Press the MENU button
and hold down the, “ (Enter, Source)” button for more than five (5) seconds to
return the monitor to factory mode.
When the Power Does Not Turn On
When turning on the Power button after connecting the power
cable, the LED at the front of the monitor does not operate.
Check the IC604 power fuse and the IC604 output power.
Check the connections for the CN601 and the Main board inside the monitor.
Check the Main board power part and also check whether there is any abnormal output at any of the other output terminals.
Check the connections for the CN601 and the Main board inside the monitor.
Check the Main board power part and also check whether there is any abnormal output at any of the other output terminals.
When the screen is blank (Analog)
Even though the LED power turns on, the screen is blank when
connecting the VGA cable.
Check the D-sub cable connections.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
When a blank screen is displayed
(HDMI)
Even though the LED power turns on, the screen is blank when
connecting the HDMI cable.
Check the HDMI cable connections.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
Check whether the LVDS cable is connected correctly to the panel.
Check whether the lamp connector of the panel is connected correctly to the Main board.
Symptom: HDMI signals are not recognized.
Cause: This error occurs because the PC cannot recognize the mode information since the HDMI DDC is not input to the monitor.
Action: Input the HDMI DDC.
Cause: This error occurs because the PC cannot recognize the mode information since the HDMI DDC is not input to the monitor.
Action: Input the HDMI DDC.
Symptom: A full white screen is displayed regardless of the
signals when turning on the monitor.
Cause: This error occurs when only lamp power is supplied and the video signals are not input to the panel due to an LVDS cable connection error.
Action: Replace the LVDS cable or connect the cable correctly so that the video signals can be supplied to the panel.
Cause: This error occurs when only lamp power is supplied and the video signals are not input to the panel due to an LVDS cable connection error.
Action: Replace the LVDS cable or connect the cable correctly so that the video signals can be supplied to the panel.
Symptom: When connecting the DVD, noise occurs on the screen.
Cause: The HDCP key is not inserted.
Action: Enter the HDCP key.
Cause: The HDCP key is not inserted.
Action: Enter the HDCP key.
Entering Service Mode
Entering: Menu > Brightness 0 > Contrast 0 > Hold down the Enter button for five (5) seconds.
Exiting: Power OFF > Power ON
Entering: Menu > Brightness 0 > Contrast 0 > Hold down the Enter button for five (5) seconds.
Exiting: Power OFF > Power ON
Checking the Code Version
Check the MCU code version and checksum after entering SVC Mode.
Entering SVC Mode
Adjust the Brightness and Contrast values to 0.
Hold down the Enter button for five (5) seconds.
The SVC Function OSD is displayed.
To exit the SVC Function, turn the power off.
Safe Mode When the input signal is higher than the supported frequency of the product, safe mode gives users some time (one minute) to change the video card settings to the Recommended Mode settings.
Check the MCU code version and checksum after entering SVC Mode.
Entering SVC Mode
Adjust the Brightness and Contrast values to 0.
Hold down the Enter button for five (5) seconds.
The SVC Function OSD is displayed.
To exit the SVC Function, turn the power off.
Safe Mode When the input signal is higher than the supported frequency of the product, safe mode gives users some time (one minute) to change the video card settings to the Recommended Mode settings.
Service Mode (Moving around)
Press the + button to move to other items.
Press the + button to move to other items.
Press the [ -- ] button to change the setting to On or Off.
When replacing the panel
After replacing the panel, move to the Panel item and hold down the Menu button for five (5) seconds. The Ch. No is incremented by 1 and then both the On Time and Cycle are set to 0.
After replacing the panel, move to the Panel item and hold down the Menu button for five (5) seconds. The Ch. No is incremented by 1 and then both the On Time and Cycle are set to 0.
Wiring diagram
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