4-4. No DVI Video
Symptom The LED power turns on but the screen is blank when the DVI cable is connected.-
Major
checkpoints
Check the DVI 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 IP board.
Check the circuit related DVI input and scaler operation.
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Diagnostics
CN401
C603
IC302
CN101
IC201
R214,R215
R131,R132
Yes
Check the power port.
No
Does the LED light up when turn on
the power?
Does 5V appear at Pin 19 of CN101
DVI port?
Check the cable connection.
No
Yes
Does the wave form as the gure
appear at R131 (DVI_SCL) and R132
(DVI_SDA) ⑦?
Replace IC201.
No
Yes
Does the signal appear at R214(DDC_
SCL_DOUT) ⑦ and R215(DDC_
SDA_DOUT) ⑧?
IC302 is abnormal. Replace
the main board.
No
Yes
Does the TX** signal appear at Pin 16
and 17 of CN401?
The Scaler (IC302) is
abnormal.Replace the main
board.
No
Yes
Check the cable between the main
board and panel
and replace the LCD panel.
Caution Make sure to disconnect the power before working on the IP board.
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