No Hdmi Video - Samsung 320TSn-2 Service Manual

4. Troubleshooting

4-5. No HDMI Video

Symptom The LED power turns on but the screen is blank when the BNC cable is connected.
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Check the BNC cable connections.
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Major
Check whether the LVDS cable is connected correctly to the panel.
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checkpoints
Check whether the lamp connector of the panel is connected correctly to the IP board.
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Does the LED light up when turn on
Diagnostics
Does 5V appear at Pin 19 of C201 DVI
Does the signal appear at R214(SCL_
Does the signal appear at R214(DDC_
Does the TX** signal appear at Pin 16
Check the cable between the main
Caution Make sure to disconnect the power before working on the IP board.
4-8
R214,R215
the power?
Yes
port?
Yes
HD) ⑦ and 215(SDA_HD) ⑧?
Yes
SCL_DOUT) and R215(DDC_
SDA_DOUT) ?
Yes
and 17 of CN401?
Yes
board and panel and
replace the LCD panel.
CN401
C603
IC302
IC201
CN201
CN101
No
No
No
No
No
Press the power button and
check the LED.
Reconnect the BNC cable.
Replace IC102.
The IC302 is abnormal.
Replace the main board.
The scaler (IC302) is
abnormal.
Replace the main board.