4-3. HDMI No Screen
Symptom
The LED power turns on but the screen is blank when the HDMI cable is connected. -
Major
checkpoints
Check the HDMI cable connections. -
Check whether the LVDS cable is connected correctly to the panel. -
Check the circuit related HDMI input and scaler operation. -
Diagnostics
IC1001
IC601
CN602
CN201
CN604
Yes
No
Does Function LED persists white
light after power on?
Power adapter
Yes
No
Dose proper 5V appear at pin No.
18 of CN604 or CN602?
Check HDMI cable connection
Yes
No
Does proper signals appear at pin
No.91(SDA) 6 and No.92(SCL)7
of IC601?
Change IC601.
No
Does proper clock signals
appear at pin NO.11,12, 23, 24
of CN604 or CN602? 8,9
Change main board
because of scaler problem
Yes
Check connection between main
board and panel.
Change Panel.
Caution Make sure Power connection before checking the Main Board.
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