When A Blank Screen Is Displayed (Hdmi-Digital Signal) - Samsung QB43R Service Manual

Troubleshooting

4-2-3. When a blank screen is displayed (HDMI-Digital signal)

• The screen is not displayed when the audio is working.
Symptom
Check the HDMI source.
Main check
points • This may happen when the USIT cable connecting the Main Board and the Panel is disconnected.
Troubleshooting
guide
Precautions • Be sure to disconnect the power and start working.
4-10
Is blank screen display,
when power indicator is off &
lamp(back light) is on?
Yes
Are HDMI input signal and HDMI cable
Connection normal?
Yes
Does signal appear to
pin 1,3,4,6,7,9,10,12(HDMI1~2)
of CN2102, CN2103 ?
Yes
Does digital data appear to pin 47~78
of CN1300 and pin 26~57 of CN1301 ?
Yes
Check the USIT cables.
Replace the LCD panel.
No Check the set at 'Standby Mode'.
Change PC cable.
No
Change Main Board.
Check external device setting.
Check HDMI cable.
No
If the problem is continue, change
Main Board.
No Change IC 901 or Main Board.
No Ask for technical support.